BoilerFaultCodes 88:1 Low
Boiler Fault Code 88:1
Also written as 881 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 88:1 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's control panel has switched from Celsius to Fahrenheit, meaning temperatures are being displayed using a different measurement system rather than showing a mechanical fault. (As reported on Viessmann Vitodens 300-W)
Pick your boiler brand for the 88:1 fix
Source
Information for the 88:1 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