Boiler Fault Code 2.6

Also written as 26 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026

Fault code 2.6 appears across 1 boiler brand and 5 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 maintain a consistent temperature because the difference between the target heat set on your programmer and the actual water temperature is too large. (As reported on Worcester Bosch ZB 7 27 HE)