BoilerFaultCodes Er.17 High
Boiler Fault Code Er.17
Also written as ER17 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Er.17 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 internal safety system which manages water pressure is leaking, meaning the boiler has temporarily shut down to prevent water damage. (As reported on Vaillant Turbomax Pro 28 2E)
Pick your boiler brand for the Er.17 fix
Source
Information for the Er.17 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