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
TG / TH FC10 HX OT1 open - airflow restriction Click here to view YouTube video Spectrolink SCC accessing and clearing fault code history ...
Tue, 24 Oct, 2023 at 4:18 PM
TQ DGH FC4, FC5, FC9, FC15, FC16 - Thermistor testing and related faults TQ Thermistor & Bracket Pt# 651912 TQMD Thermistor & Lead Pt# 647067...
Fri, 13 Jun, 2025 at 2:06 PM
TG, TH DGH FC7 & FC11 - Flame signal strength test FC+ and FC- 1.5VDC and above is good Click here to view YouTube video Spectrolink SCC accessing a...
Tue, 24 Oct, 2023 at 4:20 PM
THM DGH Fault Code Diagnostics Click here to view YouTube video Spectrolink SCC accessing and clearing fault code history
Tue, 24 Oct, 2023 at 4:20 PM
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 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: SETTING...
Wed, 15 May, 2024 at 2:20 PM
TQA 5X30 FC23 (room fan not running) Diagnostics Fault code history can be accessed: SETTINGS/SERVICE/GAS HEATER 01/7378 CONT/FAULT LOG YouTube Vi...
Wed, 15 May, 2024 at 2:17 PM
TQ DGH FC10, FC19 - FC10 HX OT1 Open and FC19 HX OT2 Open - Over-temperature switch identification Fault code history can be accessed: SETTINGS/SERVICE...
Wed, 21 May, 2025 at 2:51 PM
TQM THM DGH - Confirming modulating gas valve operation
Tue, 23 May, 2023 at 10:33 AM