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Vaillant Fault Code F.28


Start-up failure: Ignit. unsuccessful: Gas meter defective or gas pressure monitor has triggered, air in gas, gas flow pressure too low, thermal isolator device (TAE) has triggered, condensate duct blocked, incorrect gas restrictor, incorrect spare part gas valve, value in D.052 does not correspond to the printed value on the current gas valve, fault on the gas valve, multiple plug on PCB incor- rectly plugged in, break in cable harness, ignition system (ignition trans- former, ignition cable, ignition plug, ignition electrode) defective, ionisa- tion current interrupted (cable, electrode), incorrect earthing of product, electronics defective

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