Hi, i am getting f28 code on this boiler, an engineer has already replaced the board and gas valve yesterday. Same code appears.
Called vaillant today and did checks on board for power at gas valve and resistance on connector which was not correct.
He says the gas valve lead should have been changed when pcb was changed as old lead has blown new board. Anyone came across this?
When unplugging gas lead off board there is black scorch marks on connector between the live and neutral which is a tell tale sign i guess.
Cheers
Called vaillant today and did checks on board for power at gas valve and resistance on connector which was not correct.
He says the gas valve lead should have been changed when pcb was changed as old lead has blown new board. Anyone came across this?
When unplugging gas lead off board there is black scorch marks on connector between the live and neutral which is a tell tale sign i guess.
Cheers