As per @ScottishGasMan said get a “decent” engineer and get him/her to check the pcb (probably the cause) and if it’s not that get them to check the 2 port.
F.22 is usually low system pressure, would be interested to know how it was diagnosed as a PCB. Do you know how to check and top up your system pressure?
We have to replace pcb because boiler was locking out everytime we reset and ends with f22 error after replacing pcb f22 error stopped, so replacing pcb is correct thing to do
Just spoke valliant support they said permanent rad symbol means it's ready to operate buts it's not actually heating anything is this correct?
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