Problems with Worcester Greenstar HE Plus

[beammeupscotty]

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 ?

 

[Deleted member 120897]

Need more information about the boiler 1st. Is it a Combi version? Maybe post photo of said boiler?

 

[beammeupscotty]

Need more information about the boiler 1st. Is it a Combi version? Maybe post photo of said boiler?

 

[Gasmk1]

Get him to check electrodes