Started getting a random F7 fault on our gas boiler, called out a gas engineer to have a look at it. He gave it a good look over and checked and it was working while he was there. A few hours later the problem started up again, called the gas engineer who fitted a new main board, boiler was fine for three or four hours then started having the random F7 fault coming up again.
Any thoughts what it might be ?
Any thoughts what it might be ?
