Boiler Fault Code 348 EE

Also written as 348EE — same fault.

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

Fault code 348 EE appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has detected that the water inside the system is getting much hotter than it should be, so it has shut down to prevent damage or overheating. (As reported on Worcester Bosch Greenstar CDi Compact)