BoilerFaultCodesTechnical description
Start-upfailure:Ignit.unsuccessful | Gasmeterdefectiveorgasflowmonitorhastriggered,airingas,gas flowpressuretoolow,thermalisolatordevice(TAE)hastriggered,con- densaterouteblocked,incorrectgasinjector,incorrectsparepartgas valveassembly,valueinD.052doesnotcorrespondtotheprintedvalue onthecurrentgasvalveassembly,faultonthegasvalveassembly,mul- tipleplugonPCBincorrectlypluggedin,breakincableharness,ignition system(ignitiontransformer,ignitioncable,ignitionplug,ignitionelec- trode)defective,ionisationflowinterrupted(cable,electrode),incorrect earthingofproduct,electronicsdefective
What causes this fault?
This fault occurs when the boiler tries to light the gas flame but doesn't detect one after several attempts. The most common reason is a disruption in the gas supply, such as an isolated meter or a blockage, though it can also be caused by worn-out spark components that are no longer strong enough to ignite the fuel.
This fault is frequent during the first cold snap of winter, as older gas valves can stick after being inactive during the summer or external gas meters may be affected by freezing temperatures.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.