A 37 High

Boiler Fault Code A 37

Also written as A37 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code A 37 appears across 2 boiler brands and 3 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 computer is experiencing a communication error, meaning it has safely shut itself down to prevent unpredictable operation. (As reported on Chaffoteaux Minima HE)

Pick your boiler brand for the A 37 fix

Ariston A 37 2 models Chaffoteaux A 37 1 model

Source

Information for the A 37 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