TQ DGH FC1, FC2, FC3 - FC1 PS low closed at start, FC2 PS low failed to close, FC3 PS low opened during run
Fault code history can be accessed:
SETTINGS/SERVICE/GAS HEATER 01/7378 CONT/FAULT LOG
YouTube Video - MagIQtouch Heater Fault Log
For ALL pressure switch failed to close and opened during run faults always check the integrity of the combustion fan pressure hose spigot (pressure tapping)
Remove and check that there is no partial blockages on the other side of the spigot (pressure tapping) caused by by products of combustion
COMBUSTION FAN SUCTION PRESSURE - CORRECT METHOD OF TESTING FOR ACCURATE READINGS DURING NORMAL HEATER OPERATION