Search my own database of fault, diagnostic and status codes to aid in fault identification.
Poor flow, low pressure or air lock.
Check everything is plugged into the PCB correctly, this is common after PCB replacement.
Check for pressure, air in system or pump, failure, is there flow?
Ignition fault. Could be condensate, ignition set or gas valve/PCB.
New PCB, although has been seen to flag up with loose ignition leads or defective spark box.
Likely to be PCB, however check probes first.
Possibly gas valve, perform blip test, otherwise PCB.
