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Vaillant Heat Only Boiler - Water Flow Problem?
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...