How much does it cost to fix boiler error code b20?

Typical repair cost for the boiler b20 fault is £0-120 including labour.

b20 Medium

Boiler Fault Code b20

Also written as B20 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code b20 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 paused because an external safety device or switch has told it to stop running for a short period. (As reported on Remeha Quinta 30)

Pick your boiler brand for the b20 fix

Remeha b20 2 models

Source

Information for the b20 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