352 High

Boiler Fault Code 352

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 352 appears across 3 boiler brands and 4 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 is unable to communicate with its pressure sensor, meaning it cannot verify if there is enough water in the system to run safely. (As reported on ECA FELiS FL 50 HM)

Pick your boiler brand for the 352 fix

ECA 352 1 model Navien 352 2 models Viessmann 352 1 model

Source

Information for the 352 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 7 July 2026