How much does it cost to fix boiler error code ER 19?

Typical repair cost for the boiler ER 19 fault is £120-220 including labour.

ER 19 Medium

Boiler Fault Code ER 19

Also written as ER19 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code ER 19 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 is struggling to accurately measure the temperature of the incoming cold water, which may cause your hot water to be inconsistent or unavailable. (As reported on Johnson Starley Warmcair DW)

Pick your boiler brand for the ER 19 fix

Biasi ER 19 2 models Johnson Starley ER 19 1 model

Source

Information for the ER 19 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