Boiler Fault Code 4.13

Also written as 413 — same fault.

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

Fault code 4.13 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's internal computer parts are failing to talk to each other, meaning the system cannot operate or provide heat and hot water. (As reported on Ideal Logic Code Combi ESP1)