How much does it cost to fix boiler error code E 20?

Typical repair cost for the boiler E 20 fault is £250-450 including labour.

E 20 Emergency

Boiler Fault Code E 20

Also written as E20 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code E 20 appears across 4 boiler brands and 7 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has detected a safety fault where it thinks a flame is present when it should be turned off, so it has shut itself down to keep your home safe. (As reported on Vokera Verve I 50)

Pick your boiler brand for the E 20 fix

Ariston E 20 4 models Chaffoteaux E 20 1 model Vokera E 20 1 model Warmhaus E 20 1 model

Source

Information for the E 20 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 7 July 2026