Boiler Fault Code 97:0

Also written as 970 — same fault.

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

Fault code 97:0 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 is notifying you that it is using the reading from the outdoor temperature sensor to manage its operation, which may be a temporary update or a minor communication check. (As reported on Viessmann Vitodens 300-W)