Diagnostics and Specific Fault Finding
Gas Heating diagnostics and fault finding
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
THM5 - THM6 Start and Run flowcharts - fault diagnosis flowchart for normal operation
Tue, 9 Jul, 2024 at 2:48 PM
TQ DGH - FC20, FC21, FC35, FC36 Flame rollout failures - bridging loom (Pt # 651071) Fault code history can be accessed: SETTINGS/SERVICE/GAS HEATER 01...
Wed, 15 May, 2024 at 2:23 PM
Start-up and Run Flowcharts TQ Single Stage TQ3 TQD3 BMQ3
Mon, 10 Jul, 2023 at 9:01 AM
Kit Pt# 651799 replaces both sparker and sensor in TQ condensing heaters Kit Pt# 651800 replaces both sparker and sensor in ...
Mon, 15 May, 2023 at 12:14 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, 19 Aug, 2025 at 9:23 AM
Advise for home owners Gas rate & fan speed adjustment TQM, TQS4, TQS5, TQS6 and TQS7 series heaters
Advise for home owners Gas rate & fan speed adjustment TQM, TQS4, TQS5, TQS6 and TQS7 series heaters
Fri, 13 Aug, 2021 at 12:59 PM
TQM THM DGH - Confirming modulating gas valve operation
Tue, 23 May, 2023 at 10:33 AM
TQA5X30 FC23 Fault – Room Fan Not Running Diagnostics (Nicotra Interface PCBA) Fault code history can be accessed: SETTINGS/SERVICE/GAS HEATER 01/7378...
Mon, 15 Jun, 2026 at 1:08 PM
TQ DGH - Measured output voltage to motor is less than 240 Volts - FC4 Thermistor > 70 deg C during run, FC10 HX OT1 opened, FC19 HX OT2 opened Infor...
Mon, 15 May, 2023 at 12:29 PM