How much does it cost to fix boiler error code OT ERROR?

Typical repair cost for the boiler OT ERROR fault is £120-220 including labour.

OT ERROR Medium

Boiler Fault Code OT ERROR

Also written as OTERROR — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code OT ERROR appears across 1 boiler brand and 4 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is staying on constantly because a safety sensor thinks the pipes are freezing, causing it to ignore your thermostat controls. (As reported on Remeha Avanta 18V)

Pick your boiler brand for the OT ERROR fix

Remeha OT ERROR 4 models

Source

Information for the OT ERROR 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