Fixed price cost was as you said. I got hold of a pcb which, when fitted, cleared the sparking problem. All seems to work ok except for the need in CH operation to make 11 to 14 attempts with partial ignition before going to full burn. For DHW it fully ignites first time, every time. Does this...
It looks like the main pcb needs replacing to cure a fault of continuous sparking once the burner is lit. Flame sensor and ignition leads and electrodes are ok. Does anyone know of any checks/adjustments that need to be made both before fitting, to avoid damaging the new board and afterwards to...
Recently the boiler stopped firing up on both DHW and CH. When I moved the flame sensor electrode cable at the main board terminal the system roared into life and when held in position continued to work for 36 hours. The system then failed to start again - no spark. Checked APS to find poor...