BoilerFaultCodes 20.33 Low
Boiler Fault Code 20.33
Also written as 2033 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 20.33 appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is displaying a technical system information code rather than a fault, which usually occurs when the unit has been recently installed or had its settings adjusted. (As reported on Glow-worm EnergySaver)
Pick your boiler brand for the 20.33 fix
Source
Information for the 20.33 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