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I have a Vaillant EcoTEC Plus 415 Heat Only Open Vent Boiler throwing up a F.22 fault code as soon as it ignites and then goes idle. It then sits with pump running and an S.98 status until the boiler is switched off and reset.
F.22 = Too little water in the appliance, water pressure sensor defective, cable to pump or water sensor defective, pump blocked or defective, pump output too low.
S.98 = Flow-/Return-sensor check is running, demand (DHW or heating) is blocked.
This happened after MagnaClean was cleaned, fired back up and heard a few knocks at boiler followed by it shutting down. Found fair amount of sludge at pump, motorised valve and section of pipe near F&E supply so all replaced. Thermistors also replaced. Pump sounds like it is happily sending water round system but boiler fault code unchanged.
I'm thinking sludge has been thrown into boiler and clogged up heat exchange? Or possibly PCB fault throwing incorrect error? Any agreement or anything else I should try?
F.22 = Too little water in the appliance, water pressure sensor defective, cable to pump or water sensor defective, pump blocked or defective, pump output too low.
S.98 = Flow-/Return-sensor check is running, demand (DHW or heating) is blocked.
This happened after MagnaClean was cleaned, fired back up and heard a few knocks at boiler followed by it shutting down. Found fair amount of sludge at pump, motorised valve and section of pipe near F&E supply so all replaced. Thermistors also replaced. Pump sounds like it is happily sending water round system but boiler fault code unchanged.
I'm thinking sludge has been thrown into boiler and clogged up heat exchange? Or possibly PCB fault throwing incorrect error? Any agreement or anything else I should try?