Your boiler has detected an issue with the fuel-to-air balance that could affect safe operation, so it has safely shut itself down to prevent any risk.

Technical description

Safetyswitch-off:COlimitexceeded Safetyshutdown:COlimitvalueexceeded Acomponentinthecombustionregulationisdefective – Contactfaultatthegasvalveassembly(plugnotpluggedincor- rectlyornotpluggedin,plugdefective,slotisdefective(loosecon- nection)) – Ifthefaultoccursagainafterbeingreset:Thegasvalveassemblyis defective