How much does it cost to fix boiler error code Er 08?

Typical repair cost for the boiler Er 08 fault is £100-£180 including labour.

Er 08 Low

Boiler Fault Code Er 08

Also written as ER08 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 31 August 2026

Fault code Er 08 appears across 2 boiler brands and 10 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has lost the ability to read the outside temperature, meaning it cannot automatically adjust your heating performance based on the weather. (As reported on Biasi Advance Plus 16S 25S 30S)

Pick your boiler brand for the Er 08 fix

Biasi Er 08 9 models Johnson Starley Er 08 1 model

Source

Information for the Er 08 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 31 August 2026