How much does it cost to fix boiler error code F/R ∆T = 45°C?

Typical repair cost for the boiler F/R ∆T = 45°C fault is £120-350 including labour.

F/R ∆T = 45°C High

Boiler Fault Code F/R ∆T = 45°C

Also written as FRT45C — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code F/R ∆T = 45°C 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 has sensed that water is not circulating quickly enough through the system, so it has safely shut down to prevent overheating. (As reported on Remeha Quinta 30)

Pick your boiler brand for the F/R ∆T = 45°C fix

Remeha F/R ∆T = 45°C 1 model

Source

Information for the F/R ∆T = 45°C 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