BoilerFaultCodes 0A37 – Pro Tec 50 High
Boiler Fault Code 0A37 – Pro Tec 50
Also written as 0A37PROTEC50 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 0A37 – Pro Tec 50 appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has stopped working because water is not moving through the heating system quickly enough to prevent the unit from overheating. (As reported on Alpha Pro Tec Plus)
Pick your boiler brand for the 0A37 – Pro Tec 50 fix
Source
Information for the 0A37 – Pro Tec 50 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