PCB 38 HW light flashing High

Boiler Fault Code PCB 38 HW light flashing

Also written as PCB38HWLIGHTFLASHING — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code PCB 38 HW light flashing 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's hot water sensor is struggling to communicate with the main control board, meaning the system cannot accurately monitor the water temperature. (As reported on Ideal Classic FF)

Pick your boiler brand for the PCB 38 HW light flashing fix

Ideal PCB 38 HW light flashing 1 model

Source

Information for the PCB 38 HW light flashing 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