353 -- Low

Boiler Fault Code 353 --

Also written as 353 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 353 -- appears across 2 boiler brands and 14 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has automatically locked itself out temporarily because it has been running non-stop for too long, but it will reset itself and start working again shortly. (As reported on Worcester Bosch Greenstar CDi Compact)

Pick your boiler brand for the 353 -- fix

Navien 353 -- 6 models Worcester Bosch 353 -- 8 models

Source

Information for the 353 -- 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