Boiler Fault Code 54:1

Also written as 541 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026

Fault code 54:1 appears across 1 boiler brand and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's solar control system is having trouble communicating with its temperature sensors or the pump, meaning your solar water heating may not be working correctly. (As reported on Viessmann Vitodens 300-W)