KGHV Dominator Series – “Inner and Outer Board Communication” (E6 Fault) - Condensate Pump Spacer (Pt# 655540)

Possible Safety Float Triggered by Full Condensate Tray - Condensate Pump Spacer (Part 655540) 

Overview

The “inner and outer board communication” fault (displayed as E6 on XE71 or “inner and outer board com” on LE60) typically indicates a communication issue between the indoor and outdoor PCBs.
However, this fault can also be triggered by the safety float switch due to a full condensate tray, especially during cooling mode.

Common Causes

  • Blocked Drain
    Ensure the drainpipe is clear and unobstructed.

  • Low Airflow Settings

    • May have been set too low during commissioning.
    • Can lead to excess condensate overwhelming the drainage system.

  • Pump Issues

    • Debris blocking the impeller.
    • Bent pump bracket causing inlet to bottom out.
    • Pump clearance should be 5 mm above tray base.

  • Float Switch Mounting

    • Should be mounted 8–10 mm above tray base.
    • Incorrect mounting may cause premature triggering.

Important Note

There is no user reset for this fault.
Once the float switch is triggered:

  • The system locks out the indoor fan and condensate pump.
  • Recovery requires manual intervention or waiting for water to evaporate (which may take hours or days).

Technician Steps to Clear / Reset Fault

  1. Remove access panel to pump.
  2. Manually hold float switch down to clear fault.
  3. Run unit in Fan-Only mode to activate drain pump.
  4. Verify pump operation:
    • Confirm water evacuation.
    • Check for proper flow and no obstructions.
  5. Install Condensate Pump Spacer (Part 655540) if pump is sitting flush on tray:
    • Clip spacer onto bottom of pump to provide 4 mm clearance from tray floor.
    • This prevents pump suctioning to the tray and ensures normal operation.
  6. Additional Fitment Notes (Based on Field Observations):
    • If the pump is completely bottomed out with no play in mounting bolts, install the spacer first.
    • After installing the spacer, if the pump leans outward due to lack of bolt adjustment:
      • Use a 5 mm drill bit to enlarge the mounting holes in the drain tray, allowing the pump to be raised by a few millimetres. After drilling, ensure all swarf is completely removed from the tank, as any remaining debris may be drawn into the pump and cause blockages.
    • Ensure the pump sits level and maintains proper clearance after adjustment.
  7. Release float switch and refit access panel.


Preferred option:


Recommended Parts

  • Condensate Pump Spacer – Part No. 655540

(Image of Condensate Pump Spacer Part No. 655540 and installation position here)





EXTERNAL INSTALLATIONS IF UNABLE TO ACCESS THE PUMP MOUNTING PANEL - REMOVE THE END PANEL!!!

For external installations where the side pump access panel cannot be accessed, you can instead remove the end panel and raise the pump mounting height by removing the rubber block from the top of the pump.

To do this, remove the screws on the top of the pump and lower the pump to take out the rubber pad. When refitting the pump with the spacer installed, removing this pad raises the pump by the pad’s thickness, allowing it to sit level.

 

Follow the procedure below to complete this process.


Click here to view Video - How to raise Pump Height by Removing Rubber Block