Diagnostics and Specific Fault Finding
Gas Heating diagnostics and fault finding
TQ DGH - FC13, FC14 - FC13 PS high failed to close, FC14 PS high opened during run FC13 Pressure Switch high failed to close, FC14 Pressure Switch hig...
Wed, 18 Jun, 2025 at 10:11 AM
TQ TQM FC51 Micro 2 Error Found - Error Code: (51) Micro 2 Error Found Description: The ICS (Integrated Control System) has detected an error on ...
Wed, 11 Jun, 2025 at 12:41 PM
TG / TH DGH FC1, FC2, FC3 P-100 (3 star) P-55 (4/5 star) pressure switch related faults FC1: P-100 (3 star) or P-55 (4/5 star) closed at start FC2: P-...
Tue, 19 Aug, 2025 at 9:24 AM
TQ DGH FC4, FC19 - FC4 Thermistor > 70 deg C during run, FC10 HX OT1 opened, FC19 HX OT2 opened Fault code history can be accessed: SET...
Wed, 15 May, 2024 at 2:11 PM
TQ DGH - FC32 FC45 Combustion air pressure too low at start and during run T pieces to connect inline with hoses and manometer can be purchased t...
Mon, 16 Jun, 2025 at 1:10 PM
TQS7 FC23 - Room fan not running - Motor/Speed Sensor Diagnostics The TQS7 heater uses a Room fan status signal PCB that monitors if the room fan mot...
Mon, 8 Nov, 2021 at 3:02 PM
Start-up and Run Flowcharts TQ Modulating TQS4 TQS5 TQM5 TQA5 TQMD5 TQM6 TQS6 TQS7 SSQ5
Mon, 10 Jul, 2023 at 9:08 AM
TQ DGH - FAULT RESET Button Location on ICS PCB - next to gas valve plug (yellow black and orange wires) Fault code history can be accessed: SETT...
Wed, 15 May, 2024 at 2:31 PM
TQ DGH - FC7 intermittent TQ3* & BMQ3* Cross ignition air disturbance Fault code history can be accessed: SETTINGS/SERVICE/GAS HEAT...
Wed, 15 May, 2024 at 2:08 PM
Start-up and Run Flowcharts TQ Two-Stage TQS3 TQ4 TQ5 SSQ4
Thu, 27 Jul, 2023 at 12:00 PM