BoilerFaultCodes T1/T2 High
Boiler Fault Code T1/T2
Also written as T1T2 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code T1/T2 appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler's internal thermostat or control wiring has lost connection, preventing the heating from firing up. (As reported on Ideal Falcon Gte)
Pick your boiler brand for the T1/T2 fix
Source
Information for the T1/T2 fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026