Diagnostics and Specific Fault Finding
Gas Heating diagnostics and fault finding
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, 24 Oct, 2023 at 4:16 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
Start-up and Run Flowcharts TQ Two-Stage TQS3 TQ4 TQ5 SSQ4
Thu, 27 Jul, 2023 at 12:00 PM
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
TG TH - FC11 Displayed to user on the Spectrolink CC control Click here to view YouTube video Spectrolink SCC accessing and clearing fault code history ...
Tue, 24 Oct, 2023 at 4:14 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
TQ / TH / TG - Gas valve 1 & 2 stage confirming / testing operation
Tue, 5 Sep, 2023 at 2:14 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
TQ DGH - FC50 MagIQtouch controller communication loss Fault code history can be accessed: SETTINGS/SERVICE/GAS HEATER 01/7378 CONT/FAULT LOG YouTu...
Wed, 15 May, 2024 at 2:32 PM
TG / TH - 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 TH/T...
Fri, 13 Jun, 2025 at 2:10 PM