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Any chance you know the proper grant code for this circuit board. Mine is a grant combo vortex 26 fitted in 2006 and is having exactly the same fault. In my case the hot water doesn't trigger boiler to start but the second I go to take door off it kicks in. Thanks

Okay thanks,

Actually it has always been pretty poor. Good flow through tank. Heat exchanger is hot to touch Not sure if boiler kicked in every time. You don't have the ability to turn on hot water, its Heated as its wanted allegedly. There is no hot water at all now but the heating works fine. I...

Most of the time we have a problem with the hot water not being hot (or even warm). Boiler is 5 years old. Has a 12litre Expansion tank. I have water flow of mains turned down to help flow but to no avail. Heating appears to work fine and pressure appears to stay constant. Hot water...