Climate Wizard CW-H Multi-Magic PLC Fault Codes, Diagnostics & Troubleshooting Guide (2020 Onwards)


⚠️ Safety Notice – Commercial Evaporative Cooling Products


This equipment must only be installed, commissioned, serviced and repaired by suitably qualified and licensed personnel.


Before commencing work, complete a task-specific risk assessment and ensure safe roof access, fall protection requirements, electrical isolation procedures, service clearances and appropriate PPE have been considered. All work must comply with applicable regulations, standards and manufacturer requirements.


Particular care must be taken when working at heights, in roof spaces, ceiling spaces and other restricted access areas. Additional consideration must be given to confined working conditions, electrical hazards, moving parts, water systems, wet surfaces, manual handling risks and weather conditions.


Do not proceed if safe access, weather conditions, required clearances, confined space risks or appropriate safety controls cannot be achieved and maintained.


Safety takes priority over diagnosis, repairs, installation schedules and customer expectations. If the task cannot be completed safely, it must not proceed until the risks have been adequately controlled.

Quick Navigation

TABLE OF CONTENTS - Click any heading below to jump directly to the relevant troubleshooting section  

Overview

This guide provides fault code diagnostics, troubleshooting procedures and service information for Climate Wizard CW-H Horizontal units fitted with Multi-Magic PLC controls.

Use this guide to diagnose:

  • Water management faults
  • Supply motor faults
  • Chlorinator faults
  • Sensor faults
  • Communication faults
  • Startup and operational issues

Follow the fault-specific troubleshooting procedures to identify the cause of the fault before replacing components.

Applicable Models

This guide applies to Climate Wizard CW-H Horizontal units fitted with Multi-Magic PLC controls, generally identified by the PLC located inside the electrical enclosure.

The attached Multi-Magic CW-H documentation covers:

  • CW-H15
  • CW-H15S
  • CW-H15S Plus

For CW-H15S and CW-H15S Plus models, refer to the Supercool setup section in this guide for additional commissioning checks.

⬆ Back to Table of Contents 

Safety Information

⚠️ WARNING

Only suitably qualified, trained and licensed personnel should perform installation, service, maintenance and repair work.

Before commencing diagnostics:

  • Isolate mains power where required.
  • Follow site lock-out/tag-out procedures.
  • Ensure safe access to equipment.
  • Wear appropriate PPE.
  • Follow all local electrical, plumbing and safety regulations.
  • Do not use replacement parts that have not been recommended by the manufacturer.

⬆ Back to Table of Contents 

Using This Guide

For the most efficient diagnosis:

  1. Record any active fault codes.
  2. Check the fault history.
  3. Follow the troubleshooting procedure for the applicable fault.
  4. Verify wiring, power supplies and controller settings.
  5. Confirm normal operation after repairs are completed.

Where multiple faults are present, investigate power, communication and water supply faults before replacing components.

⬆ Back to Table of Contents 

Service Technician First Checks

Before investigating any fault:

✅ Confirm model number

✅ Confirm the unit is fitted with Multi-Magic PLC controls

✅ Record active fault codes

✅ Check fault history

✅ Verify power supply

✅ Verify water supply

✅ Inspect wiring connections

✅ Check communication status

✅ Verify airflow

✅ Confirm PLC settings are correct for the model being serviced

Fault codes can be viewed through the PLC fault display and fault history screens.

⬆ Back to Table of Contents 


Supporting article links:

Post-2020 manufactured CW-H Installation & Operation Manual 859749-M - CW-H Multi-Magic - Install and Operation Manual


Commissioning Checklist | Post-2020 Models | Airflow Balancing Requirements


Fault Code Quick Reference

Fault CodeDescriptionMain Area to Check
FC1PLC to PCBA communication failurePCBA power, LED status, wiring, PCBA
FC2Water not detected at low probeWater supply, solenoid valve, low probe
FC3Water not detected at high probeWater flow, water pressure, high probe
FC4Low probe not cleared during drainDrain valve, drain pipework, water probe
FC5Water detected at high probe but not low probeWater management probe
FC7Supply motor errorThree phase supply, motor wiring, motor
FC10Chlorinator faultChlorinator cell, scale, debris, end of life
FC11Room air sensor faultRoom sensor wiring, PLC sensor setup
FC12Ambient air sensor faultAmbient sensor wiring, PLC sensor setup
FC14Supply duct sensor faultDuct sensor wiring, PLC sensor setup
FC15Pressure sensor faultPressure sensor wiring, pressure tubing
FC16Communication failureWall Controller, Modbus, BACnet, RS485 wiring

Fault history should be reviewed before clearing faults, especially where faults are intermittent.

⬆ Back to Table of Contents 

Start-Up and Operating Sequence

Note: Due to continuous product improvement, operating sequences and control logic may change without notice and may vary between software versions. Always refer to the latest service documentation when troubleshooting.

Understanding the start-up sequence can help identify where the unit has stopped operating.


Start-Up and Operating Sequence

Understanding the Climate Wizard start-up sequence helps identify where the unit has stopped operating and which component should be investigated. The PLC message bar and monitor screens can be used to confirm the current operating stage.

Cooling Start-Up Sequence

  1. Cooling demand received

    • Unit is commanded to run in Indirect or Supercool cooling mode.

  2. Drain valve check

    • The PLC checks the drain valve position.
    • If open, the drain valve closes before operation continues.
    • Typical duration: ~9 seconds.

  3. Water tank fill

    • The inlet solenoid valve opens if water is below the low-level probe.
    • Tank fills until the high-level probe is reached.
    • The PLC monitor screen will show the tank filling status.

  4. Chlorinator activation

    • Once water is detected at the low probe, the chlorinator is energised to maintain water quality.

  5. Pre-wet cycle

    • All three indirect pumps operate to wet the heat exchanger cores.
    • The supply fan runs at Speed 1 during this stage and cannot be adjusted.
    • Normal duration: approximately 3 minutes.
    • If the water level drops below the low probe during this process, the pre-wet timer pauses while the tank refills. Pumps continue running.

  6. Cooling operation begins

    • After the pre-wet cycle is complete, the fan increases to the selected operating speed.
    • The unit enters normal cooling operation.

Normal Cooling Run Sequence

Once operating normally, the Climate Wizard cycles water and continuously monitors water quality and water levels.

  1. Pump cycle

    • Indirect pumps operate for 1 minute.
    • Pumps then stop for 8 minutes.
    • During pump operation, the supply fan automatically reduces to Speed 1 to minimise water carry-over.
    • This cycle repeats continuously while cooling is active.

  2. Water salinity monitoring

    • Water salinity is checked approximately every minute for 10 seconds.
    • If salinity exceeds the configured set point:
      • Drain valve opens.
      • Tank drains to below the low probe.
      • Drain valve closes.
      • Solenoid valve refills the tank to the high probe.
      • Salinity is checked again.
    • The cycle repeats until salinity returns within limits.

  3. Automatic dilution cycle

    • The controller counts each refill from the low probe to the high probe.
    • After 8 tank refill cycles, an automatic drain-and-refill cycle is performed to maintain water quality, regardless of salinity reading.

  4. Continuous monitoring

    • The PLC continuously monitors:
      • Low and high-water probes
      • Drain valve operation
      • Solenoid valve operation
      • Pump operation
      • Fan operation
      • Water salinity
      • Chlorinator status
      • Active fault conditions

  5. Cooling shutdown

    • Unit continues operating until:
      • Cooling demand is removed, or
      • The controller is turned off, or
      • A shutdown fault is detected.

Diagnostic Tip

If the unit fails to start or stops operating, identify the last successful stage in the sequence before replacing components.

For example:

Unit Stops AtLikely Area to Investigate
Drain valve checkDrain valve, PLC outputs
Tank fillingWater supply, solenoid valve, probes
Pre-wet cyclePumps, water level, pump wiring
Fan Speed 1 onlyPre-wet active, water level issues
Pump cycle faultsIndirect pumps, water management system
Repeated drainingSalinity probe, water quality, drain valve
Cooling stops with fault codeRefer to PLC fault history and active fault codes


This approach often identifies the fault quickly and avoids unnecessary component replacement.


Supporting article links:

Post-2020 manufactured CW-H Installation & Operation Manual 859749-M - CW-H Multi-Magic - Install and Operation Manual


⬆ Back to Table of Contents 

CW-H15S and CW-H15S Plus Configuration Notes

Supercool models require additional setup checks during installation and commissioning.

CW-H15S

For CW-H15S models:

  • Exhaust caps are not fitted.
  • Device Type must be manually changed to CW-H15S.
  • Supply air plenum pressure must be set to 175 Pa.

CW-H15S Plus

For CW-H15S Plus models:

  • Exhaust caps must be fitted.
  • Factory Device Type setting is correct.
  • Supply air plenum pressure must be set to 210 Pa.

PLC Setup Access

To access the setup menu:

  1. Press and hold the RIGHT button until the password screen is displayed.
  2. Enter password 7378.
  3. Navigate to SETUP → DEVICE TYPE.
  4. Select the required model.
  5. Press OK to save.
  6. Return to the main control menu.


Supporting article links:

CW-H Post-2020 manufactured CW-H15S Supercool installation and set-up Climate Wizard 862801-C


⬆ Back to Table of Contents 

Water System Fault Diagnosis

FC2 - Water Not Detected at Low Probe

Description

FC2 indicates that water has not been detected at the low probe after the inlet solenoid valve has opened.

Possible Causes

  • Water supply isolated
  • Inlet solenoid valve not opening
  • Blocked inlet strainer
  • Drain valve stuck open
  • Dirty or faulty water probe
  • Low water conductivity

Troubleshooting Procedure

  1. Confirm the site water supply is turned on.
  2. Confirm the isolation valve to the cooler is open.
  3. Check that the inlet solenoid valve is operating.
  4. Inspect and clean the inlet water strainer.
  5. Confirm the drain valve is closed during filling.
  6. Inspect the water management probe.
  7. Clean the probe pins using a soft cloth.
  8. Check probe resistance as per service instructions.
  9. Reset the fault and retest.

Supporting article links:

Post 2020 Climate Wizard CW‑H – Fault Codes 2, 3, 4 & 5: Water Level, Fill & Drain Probe Faults (FC2 FC3 FC4 FC5)

⬆ Back to Table of Contents 

FC3 - Water Not Detected at High Probe

Description

FC3 indicates that water was detected at the low probe, but not at the high probe within the expected time.

Possible Causes

  • Restricted water flow
  • Insufficient water pressure
  • Dirty water probe
  • Water escaping through drain valve
  • Tank not filling correctly

Troubleshooting Procedure

  1. Confirm the tank has started filling.
  2. Check water supply pressure.
  3. Check water flow to the cooler.
  4. Inspect and clean the inlet strainer.
  5. Confirm the drain valve is sealing.
  6. Inspect the water management probe.
  7. Clean the probe pins.
  8. Reset the fault and retest.

Supporting article links:

Post 2020 Climate Wizard CW‑H – Fault Codes 2, 3, 4 & 5: Water Level, Fill & Drain Probe Faults (FC2 FC3 FC4 FC5)

⬆ Back to Table of Contents 

FC4 - Low Probe Not Cleared During Drain

Description

FC4 indicates that water is still being detected at the low probe after the drain valve has opened.

Possible Causes

  • Drain valve not opening
  • Blocked drain pipework
  • Water continuing to enter during drain cycle
  • Dirty water probe
  • Debris in tank or drain area

Troubleshooting Procedure

  1. Command the unit to drain.
  2. Confirm the drain valve opens.
  3. Inspect drain pipework for blockage or restriction.
  4. Confirm the inlet solenoid valve closes during drain.
  5. Inspect the water management probe.
  6. Clean the probe pins.
  7. Flush the tank if debris is present.
  8. Reset the fault and retest.

Supporting article links:

Post 2020 Climate Wizard CW‑H – Fault Codes 2, 3, 4 & 5: Water Level, Fill & Drain Probe Faults (FC2 FC3 FC4 FC5)

⬆ Back to Table of Contents 

FC5 - High Probe Wet, Low Probe Dry

Description

FC5 indicates an abnormal water probe condition where water is detected at the high probe but not at the low probe.

Possible Causes

  • Contaminated water probe
  • Incorrect probe reading
  • Probe wiring fault
  • Faulty water management probe

Troubleshooting Procedure

  1. Isolate the cooler safely.
  2. Remove the water management probe.
  3. Clean the probe pins with a soft cloth.
  4. Inspect for contamination or deposits.
  5. Check wiring and connector condition.
  6. Check probe readings as per service instructions.
  7. Replace the probe if readings remain incorrect.
  8. Reset the fault and retest.

Supporting article links:

Post 2020 Climate Wizard CW‑H – Fault Codes 2, 3, 4 & 5: Water Level, Fill & Drain Probe Faults (FC2 FC3 FC4 FC5)


CW-H Pt# 122687 Solenoid Upgrade Kit: Continuous Improvement, Enhanced Performance - installation 859733A

⬆ Back to Table of Contents 

Fan and Motor Diagnostics

FC7 - Supply Motor Error

Description

FC7 indicates the supply motor has entered a fault condition.

Symptoms

  • Fan not operating
  • Fan starts then stops
  • Unit trips during start-up
  • FC7 fault returns after reset
  • Intermittent fan operation

Step 1 - Verify Incoming Power

Phase-to-Phase

Check:

  • L1-L2
  • L2-L3
  • L3-L1

Expected:

  • Approximately 415 VAC

Phase-to-Neutral

Check:

  • L1-N
  • L2-N
  • L3-N

Expected:

  • Approximately 240 VAC

If supply voltages are incorrect:

  • Check site supply.
  • Check circuit breaker.
  • Check isolator.
  • Check incoming cabling.

Step 2 - Test Fan Operation From PLC

Using the PLC:

  1. Place the unit into local control mode.
  2. Select vent operation.
  3. Set fan speed to 5.
  4. Observe whether the fan starts and runs.

Step 3 - If the Fan Starts

If the fan starts and runs:

  1. Inspect motor fault wiring.
  2. Check COM terminal wiring.
  3. Check NC terminal wiring.
  4. Check for loose terminals.
  5. Inspect motor communication wiring.
  6. Reset the fault and retest.

Step 4 - If the Fan Does Not Start

If the fan does not start:

  1. Check voltage at the motor connector.
  2. Confirm all three phases are present.
  3. Inspect the motor plug and cable.
  4. Check for damaged wiring.
  5. Confirm the fan wheel rotates freely.
  6. If voltage is correct and the motor does not operate, replace the motor assembly.

Motor Inspection Checklist

Before replacing a motor, confirm:

✅ Fan wheel rotates freely

✅ No obstruction inside fan housing

✅ Ductwork is unrestricted

✅ Three phase supply is present

✅ Motor cable is undamaged

✅ Connectors are secure

✅ Motor fault wiring is secure

✅ No communication faults are active

✅ Fan has been tested from local control


Supporting article links:

CW-H FC7 Motor Error - Diagnostics (CW-H 2020 Models - PLC version)


CW-H Pre-2020 manufactured CW-H Fan/Motor replacement instructions - Gen 3 motors Climate Wizard 862798-F


⬆ Back to Table of Contents 

PLC Sensor Configuration

CW-H Multi-Magic PLC controllers use configurable sensor input channels. Sensors are configured in paired channels.

For CW-H units, the available sensor input pairs are:

  • S1 / S2
  • S3 / S4

The first channel in the pair is assigned to temperature. The second channel in the pair is automatically assigned to relative humidity.

Viewing Sensor Values on the PLC

After installation or during fault finding:

  1. Use the LEFT / RIGHT buttons to navigate to the SENSORS screen on the cooler PLC.
  2. Highlight the first sensor input channel in the pair.
  3. Press OK.
  4. Select the required sensor type.
  5. Press OK to confirm.
  6. Check that temperature and relative humidity values are displayed.
  7. Confirm the displayed values are reasonable for site conditions.

Ambient Sensor Configuration

The Multi-Magic Ambient Sensor measures external air temperature and relative humidity.

Configure the sensor pair as follows:

  • First channel: AMBNT-T
  • Second channel: AMBNT-H

The ambient sensor input range is:

  • Temperature: 0-10V = -40°C to +70°C
  • Relative Humidity: 0-10V = 0-100% RH


Supporting article links:

CW-H Post 2020 manufactured CW-H Ambient Sensor Installation Climate Wizard Multi-Magic 859728-F

Room Sensor Configuration

The Multi-Magic Room Sensor measures room temperature and relative humidity.

Configure the sensor pair as follows:

  • First channel: ROOM-T
  • Second channel: ROOM-H

The room sensor input range is:

  • Temperature: 0-10V = 0°C to 50°C
  • Relative Humidity: 0-10V = 0-100% RH

When used with a Multi-Magic Wall Controller, multiple room sensor inputs can be averaged together for larger spaces.


Supporting article links:

CW-H Post-2020 manufactured CW-H Multi-Magic room sensor installation Climate Wizard 859730-H

Supply Duct Sensor Configuration

The Multi-Magic Supply Duct Sensor measures air temperature and relative humidity inside the supply duct.

Configure the sensor pair as follows:

  • First channel: SPLY-T
  • Second channel: SPLY-H

The supply duct sensor input range is:

  • Temperature: 0-10V = 0°C to 50°C
  • Relative Humidity: 0-10V = 0-100% RH


Supporting article links:

CW-H Post-2020 manufactured CW-H Multi Magic Duct Sensor Installation Climate Wizard 859724-D


Sensor Cable Requirements

Multi-Magic ambient, room and duct sensors require:

  • 24VDC power
  • Two signal wires
  • Instrumentation cable with 4 x 0.5mm² conductors
  • Communication/sensor wiring routed at least 300mm away from high voltage cables and high-power machines
  • High power cables crossed at right angles where necessary


⬆ Back to Table of Contents 

Sensor Diagnostics and Troubleshooting

Incorrect sensor readings may result in sensor faults, unstable operation or cooling performance concerns.

General Sensor Troubleshooting Procedure

Step 1 - Confirm Sensor Type

Confirm which sensor is fitted:

  • Ambient Sensor
  • Room Sensor
  • Supply Duct Sensor
  • Pressure Sensor

Step 2 - Check PLC Sensor Configuration

On the PLC SENSORS screen, confirm the sensor channels are configured correctly:

Sensor TypeFirst ChannelSecond Channel
Ambient SensorAMBNT-TAMBNT-H
Room SensorROOM-TROOM-H
Supply Duct SensorSPLY-TSPLY-H

If the sensor is not fitted, confirm the sensor channel has not been incorrectly enabled.

Step 3 - Check PLC Readings

Review the displayed values for:

  • Temperature
  • Relative humidity
  • Pressure, where applicable

Look for:

  • 0V readings
  • 10V readings
  • Missing values
  • Values that do not match site conditions

Step 4 - Check Sensor Wiring

Inspect:

  • 24VDC supply
  • Signal wiring
  • Loose terminals
  • Broken conductors
  • Damaged insulation
  • Water ingress
  • Corrosion
  • Cable routing near high voltage wiring

Step 5 - Check Sensor Location

Confirm the sensor is:

  • Installed correctly
  • Clean
  • Undamaged
  • Not exposed to abnormal heat sources
  • Not affected by drafts, dead spots or unsuitable mounting position

⬆ Back to Table of Contents 

FC11 - Room Sensor Fault

Description

Fault Code 11 is generated when either the room temperature input or room relative humidity input remains at 0V or 10V for 10 minutes. Sensors with an active fault are automatically excluded from Wall Controller averaging calculations.

Troubleshooting Procedure

  1. Confirm the Room Sensor is fitted.
  2. Navigate to the PLC SENSORS screen.
  3. Confirm the sensor pair is configured as ROOM-T / ROOM-H.
  4. Check that room temperature and room humidity values are displayed.
  5. Confirm values are reasonable for site conditions.
  6. Check 24VDC power to the sensor.
  7. Inspect sensor wiring and terminals.
  8. Repair wiring or replace the sensor if required.
  9. Reset the fault and retest.

⬆ Back to Table of Contents 

FC12 - Ambient Sensor Fault

Description

Fault Code 12 relates to the ambient temperature or ambient humidity sensor input. The ambient sensor measures external air temperature and relative humidity.

Troubleshooting Procedure

  1. Confirm the Ambient Sensor is fitted.
  2. Navigate to the PLC SENSORS screen.
  3. Confirm the sensor pair is configured as AMBNT-T / AMBNT-H.
  4. Check that ambient temperature and ambient humidity values are displayed.
  5. Confirm values are reasonable for outdoor conditions.
  6. Check 24VDC power to the sensor.
  7. Inspect sensor wiring and terminals.
  8. Confirm wiring is not routed too close to high voltage cables.
  9. Repair wiring or replace the sensor if required.
  10. Reset the fault and retest.

⬆ Back to Table of Contents 

FC14 - Supply Duct Sensor Fault

Description

Fault Code 14 relates to the supply duct temperature or humidity sensor input. The supply duct sensor measures temperature and relative humidity inside the duct.

Troubleshooting Procedure

  1. Confirm the Supply Duct Sensor is fitted.
  2. Navigate to the PLC SENSORS screen.
  3. Confirm the sensor pair is configured as SPLY-T / SPLY-H.
  4. Check that supply temperature and supply humidity values are displayed.
  5. Inspect the sensor installation location.
  6. Check 24VDC power to the sensor.
  7. Inspect sensor wiring and terminals.
  8. Repair wiring or replace the sensor if required.
  9. Reset the fault and retest.

⬆ Back to Table of Contents 

FC15 - Pressure Sensor Fault

Description

Fault Code 15 relates to the pressure sensor input.

Troubleshooting Procedure

  1. Confirm the fan has been operating.
  2. View pressure sensor data on the PLC.
  3. Inspect pressure sensor wiring.
  4. Inspect pressure tubing.
  5. Check for blocked, split or disconnected tubing.
  6. Confirm sensor configuration is correct.
  7. Repair wiring or replace the pressure sensor if required.
  8. Reset the fault and retest.


Supporting article links:

CW-H Post 2020 manufactured CW-H Ambient Sensor Installation Climate Wizard Multi-Magic 859728-F


CW-H Post-2020 manufactured CW-H Multi-Magic room sensor installation Climate Wizard 859730-H


CW-H Post-2020 manufactured CW-H Multi Magic Duct Sensor Installation Climate Wizard 859724-D


⬆ Back to Table of Contents 

Ambient Condition Monitoring

Where a Multi-Magic Ambient Sensor is installed and enabled through the Multi-Magic Wall Controller, the controller can use Ambient Condition Monitoring.

This function uses external ambient temperature and relative humidity to calculate a Predicted Supply Temperature.

If the predicted supply temperature is higher than the current room temperature, the Wall Controller may stop the cooler even if the room temperature is above set point. This is normal operation and should be checked before investigating a cooling performance fault.

If the cooler has stopped due to Ambient Condition Monitoring, the Wall Controller may display a warning triangle and the predicted supply temperature.

Note: Ambient Condition Monitoring is not compatible with the Multi-Magic Wall Controller Minimum/Maximum Fan Speed limit function.


Supporting article links:

CW-H Post 2020 manufactured CW-H Ambient Sensor Installation Climate Wizard Multi-Magic 859728-F


CW-H Post-2020 manufactured Multi-Magic Wall Controller User Manual Climate Wizard 859731-I


⬆ Back to Table of Contents 

Communication Faults


FC1 - PLC to PCBA Communication Failure

Description

Fault Code 1 (FC1) indicates the PLC has lost communication with the Water Manager PCBA.

Communication between the PLC and Water Manager PCBA is required for normal operation of the cooler.

The fault may be caused by loss of power to the PCBA, communication wiring issues or a failed Water Manager PCBA.

Common Symptoms

  • FC1 displayed on PLC
  • Unit fails to start
  • Unit stops unexpectedly
  • Water management system unavailable
  • Fault returns after reset

Possible Causes

  • Loss of power to the Water Manager PCBA
  • Loose internal communication wiring
  • Disconnected harness connector
  • Damaged communication wiring
  • Corrosion on connectors
  • Failed Water Manager PCBA
  • Internal communication fault

Troubleshooting Procedure

Step 1 – Check Water Manager PCBA LED Status

Inspect the LED on the Water Manager PCBA.

Expected operation:

✅ Solid Green during startup

✅ Flashing Green during normal operation

Fault indication:

❌ Flashing Red

If LED operation is abnormal, proceed with power supply checks.

Step 2 – Verify Power Supply

Confirm:

✅ Main isolator ON

✅ Circuit breaker ON

✅ PLC powered correctly

✅ 24VDC power supply present

✅ Power wiring secure

If power is not present, rectify the power supply issue before proceeding.

Step 3 – Inspect PLC to PCBA Communication Wiring

Check:

✅ Communication harness connected

✅ Connectors fully seated

✅ No loose terminals

✅ No damaged wiring

✅ No corrosion

✅ No signs of overheating

Reseat all communication connectors before retesting.

Step 4 – Verify PLC Operation

Confirm:

✅ PLC display operational

✅ PLC responsive

✅ No additional controller faults present

✅ PLC startup sequence completes normally

Step 5 – Reset and Retest

  1. Clear active faults.
  2. Isolate power.
  3. Wait 60 seconds.
  4. Restore power.
  5. Allow startup sequence to complete.
  6. Confirm communication has been restored.

Step 6 – Component Replacement

Only after all power and wiring checks have been completed:

✅ Replace the Water Manager PCBA if FC1 remains active.

✅ Recommission the unit.

✅ Verify normal operation.

Diagnostic Tip

FC1 is most commonly caused by:

✅ Loss of PCBA power

✅ Loose communication connectors

✅ Failed Water Manager PCBA

Always verify power supplies and wiring before replacing electronic components.


Supporting article links:

CW‑H – Fault Code 1 (FC1): PLC to PCBA Communication Failure


⬆ Back to Table of Contents


FC16 - Communication Failure

Description

Fault Code 16 indicates the PLC has lost communication with the primary controller.

Communication may be via:

  • Multi-Magic Wall Controller
  • Modbus
  • BACnet

RS485 Communication Wiring Checklist

When diagnosing communication faults, verify the following:

✅ Suitable RS485 communication cable is used.

✅ Cable contains at least one twisted pair and a third conductor.

✅ Conductors are copper.

✅ Cable size is 0.5mm² / AWG20.

✅ Cable has braided shield with drain wire.

✅ Cable characteristic impedance is 120Ω.

✅ The twisted pair is used for the + and - signal terminals.

✅ The third conductor is used for signal GND.

✅ Shield/drain wire is connected to earth at one end only.

✅ Communication wiring is kept separate from AC power wiring.

✅ Communication wiring is routed at least 300mm away from high voltage cables and high-power machines.

✅ High power cables are crossed at right angles.

✅ Maximum cable length to the first cooler does not exceed 100m.

✅ Maximum cable length between each cooler does not exceed 100m.

RS485 Termination Resistor Checklist

For Multi-Magic Wall Controller installations:

✅ Fit the 120Ω resistor supplied with the Wall Controller between the + and - terminals of the Wall Controller.

✅ Fit the 120Ω resistor supplied with the cooler between the + and - terminals of the last cooler on the RS485 Modbus network.

✅ Do not fit terminating resistors to coolers installed between the Wall Controller and the last cooler.

FC16 Troubleshooting Procedure

  1. Identify the control method being used:

    • Wall Controller
    • Modbus
    • BACnet

  2. Check communication wiring:

    • COMMS+
    • COMMS-
    • COMMS G / signal ground

  3. Confirm the correct RS485 cable type has been used.

  4. Confirm cable routing is suitable and separated from mains wiring.

  5. Check terminating resistors are installed only at the correct locations.

  6. Confirm each cooler has a unique node address.

  7. Confirm the Wall Controller, Modbus controller or BACnet controller is powered and communicating.

  8. Reset the fault and retest.


Supporting article links:

CW-H Post-2020 manufactured Multi-Magic Wall Controller User Manual Climate Wizard 859731-I


Fault Code 16 – Climate Wizard CW‑H Communication Failure (RS‑485 / BACnet / Modbus / Wall Controller)


⬆ Back to Table of Contents 


Chlorinator Diagnostics

FC10 - Chlorinator Fault

Description

FC10 relates to a chlorinator fault condition.

Possible Causes

  • Chlorinator at end of service life
  • Scale build-up
  • Debris between blades
  • Short circuit condition
  • Poor connection

Troubleshooting Procedure

  1. Isolate the cooler safely.
  2. Remove the chlorinator.
  3. Inspect for scale and debris.
  4. Gently remove debris using a soft brush.
  5. Wash or hose the chlorinator in clean water.
  6. If required, soak in a 5% phosphoric acid solution.
  7. Rinse thoroughly with clean water.
  8. Check the blade spacing clip.
  9. Reinstall the chlorinator upright.
  10. Reset the fault and retest.


Supporting article links:

Climate Wizard CW‑H – Fault Code 10: Chlorinator Fault Diagnosis & Fix Guide - Cleaning, Testing and Replacement


CW-H Post-2020 manufactured CW-H10 and CW-H15 Chlorinator testing, removal and replacement Climate Wizard


⬆ Back to Table of Contents 

Common Service Issues

Unit Will Not Start

Check:

  • Mains power supply
  • PLC operation
  • Active fault codes
  • Fault history
  • Communication status
  • Water supply
  • Control demand
  • Model setup

Poor Cooling Performance

Check:

  • Airflow
  • Water circulation
  • Sensor readings
  • Ambient Condition Monitoring status
  • Duct restrictions
  • Control settings
  • CW-H15S / CW-H15S Plus plenum pressure setup, where applicable

Intermittent Faults

Check:

  • Loose wiring
  • Sensor wiring
  • Communication network
  • RS485 cable routing
  • Termination resistor locations
  • Motor fault wiring
  • Connector condition

Summary

This guide provides troubleshooting and fault finding procedures for Climate Wizard CW-H Horizontal units fitted with Multi-Magic PLC controls.

It includes:

  • Fault code descriptions
  • Water management diagnostics
  • Motor fault diagnosis
  • PLC sensor configuration
  • Sensor fault diagnosis
  • Ambient Condition Monitoring checks
  • RS485 communication wiring checks
  • Communication troubleshooting
  • Chlorinator diagnostics
  • Startup sequence checks
  • CW-H15S and CW-H15S Plus setup checks
  • Common service issues

Following these procedures will assist in identifying the cause of common faults and restoring correct unit operation.


Supporting article links:

CW-H Post-2020 manufactured CW-H Introduction and Installation Training


Technical Specifications CW-H



⬆ Back to Table of Contents 

Quick Reference

Before Replacing Components

Always check:

✅ Power supply

✅ Water supply

✅ Fault history

✅ Active fault codes

✅ Wiring and connectors

✅ PLC configuration

✅ Sensor channel setup

✅ Communication wiring

✅ Model setup

⬆ Back to Table of Contents 

Check:

✅ Water supply

✅ Inlet strainer

✅ Solenoid valve operation

✅ Water probes

✅ Drain valve operation

✅ Tank cleanliness

⬆ Back to Table of Contents 

FC7 Motor Faults

Check:

✅ Three phase supply

✅ Local control operation

✅ Motor wiring

✅ COM and NC fault contacts

✅ Fan rotation

✅ Motor connector condition

⬆ Back to Table of Contents 

Sensor Faults

Check:

✅ Sensor is actually fitted

✅ Sensor channel is configured correctly

✅ Temperature value is displayed

✅ Relative humidity value is displayed

✅ 24VDC sensor supply

✅ Wiring and terminals

✅ Cable routing away from high voltage wiring

⬆ Back to Table of Contents 

PLC Sensor Channel Setup

SensorTemperature ChannelHumidity Channel
Ambient SensorAMBNT-TAMBNT-H
Room SensorROOM-TROOM-H
Supply Duct SensorSPLY-TSPLY-H

FC16 Communication Faults

Check:

✅ COMMS+

✅ COMMS-

✅ COMMS G / signal ground

✅ RS485 cable type

✅ Shield/drain wire earthed at one end only

✅ 120Ω resistor at Wall Controller

✅ 120Ω resistor at last cooler only

✅ No resistor fitted to intermediate coolers

✅ Node addressing

✅ Modbus, BACnet or Wall Controller communication

⬆ Back to Table of Contents