TQ DGH - FC23 Room fan not running


Fault code history can be accessed:

SETTINGS/SERVICE/GAS HEATER 01/7378 CONT/FAULT LOG


YouTube Video - MagIQtouch Heater Fault Log 



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Motor speed sensor (Kit ICS Motor Speed Assembly) Pt# 646701 can be located on the non-drive side of the motor opposite the shaft 



Click link to view YouTube Video - Clipping room fan sensor Pt No 646701 into spare part motor


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For TQ3 heaters using a 2-wire thermostat:

If a MagIQtouch controller is not available, the ICS Motor Speed Assembly (Part #646701) must be replaced. This is because the speed sensor cannot be disabled manually or by disconnecting it—only a MagIQtouch controller can modify the ICS parameters to disable the sensor


TQ SERIES NON CONDENSING HEATERS (metal flue)
Non Condensing heaters manufactured after serial 410836 (build date 11/4/2018) DO NOT have the speed sensor fitted in the factory
  • If attending a  Non Condensing TQ series heater manufactured from the above serial number and date the speed sensor is no longer required
  • If attending a Non Condensing TQ series heater pre serial 410836 that has had the speed sensor disabled then it is OK to leave it disabled. You can unplug the speed sensor from the ICS and remove it.
  • If attending any Non Condensing TQ series heater that has a FC23 (Room fan not running) fault you should check that the room fan is actually running. If the room fan is running disable and remove the speed sensor from the heater.

The motor speed sensor can be disabled in non-condensing (metal flue) models only by the MagIQtouch controller SETTINGS/SERVICE/GAS HEATER 01/DISABLE MOTOR SPEED SENSOR
IMPORTANT NOTE!!!!
It is a requirement that ALL condensing (plastic / PVC flue) TQ heaters MUST have the motor speed sensor fitted and operational.
MUST NOT BE DISABLED IN CONDENSING (PLASTIC / PVC FLUE) TQ HEATERS 
  • Select SETTINGS on the MagIQtouch
  • Select SERVICE 
  • Select the installed heater from the list of parts found on the system
  • Enter access code 7378 when requested and push CONT
  • Page down to DISABLE MOTOR SPEED SENSOR
  • Select DISABLE MOTOR SPEED SENSOR
  • Enable/Disable as required
  • Push ACCEPT to confirm your selection
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IMPORTANT NOTE!!!!
It is a requirement that ALL condensing (plastic / PVC flue) TQ heaters MUST have the motor speed sensor fitted and operational.
MUST NOT BE DISABLED IN CONDENSING (PLASTIC / PVC FLUE) TQ HEATERS 


For TQ3 heaters using a 2-wire thermostat:

If a MagIQtouch controller is not available, the ICS Motor Speed Assembly (Part #646701) must be replaced. This is because the speed sensor cannot be disabled manually or by disconnecting it—only a MagIQtouch controller can modify the ICS parameters to disable the sensor