TG / TH Fault Codes (FC Errors) – Gas Heater Diagnostics & Common Faults


⚠️ Safety Notice – Gas Heating Products

This appliance must only be installed, commissioned, serviced and repaired by suitably qualified and licensed personnel.


Before commencing work, complete a task-specific risk assessment and ensure gas and electrical safety requirements, ventilation provisions, safe access, adequate service clearances and appropriate PPE have been considered. All work must comply with applicable regulations, standards and manufacturer requirements.


Particular care must be taken when working around gas systems, electrical components, combustion products, hot surfaces, moving parts, roof spaces, ceiling spaces and confined spaces.


Do not proceed if safe access, required clearances, ventilation requirements, confined space risks or appropriate safety controls cannot be achieved and maintained. 


Safety takes priority over diagnosis, repairs, installation schedules and customer expectations. If the task cannot be completed safely, it must not proceed until the risks have been adequately controlled.


Covers TG and TH ducted gas heater fault codes, error codes, flashing LED diagnostics, and common heater faults.


## Links to Most Common Searched TG / TH Faults 
- FC19 – Reset / over-temperature - TG, TH DGH FC19 resetting and checking for FC10's in Spectrolink fault code history: Seeley International Pty Ltd 


- FC10 – HX OT fault - TG / TH FC10 HX OT1 open - airflow restriction: Seeley International Pty Ltd 


- FC7 – Ignition failure - TG, TH DGH - FC7 & 11: Seeley International Pty Ltd 



For TQ / TQM fault codes, see related guide:

TQ / TQM Fault Codes (FC Errors) + ICS LED Flash Guide – Diagnostics & Quick Checks: Seeley International Pty Ltd



Click here to view YouTube video Spectrolink SCC accessing and clearing fault code history





YouTube video checking duct thermistor temperature using Spectrolink SCC