On power up boiler lights in hot water mode pre-heat off,C.H will not kick in because diff is activated although there is no call for dhw.
Isolate cold supply to boiler and diff goes to rest and C.H wor ks.
There are no leaks on D.H.W pipework and the differential assembly (complete) has been changed.
Any ideas ?
Isolate cold supply to boiler and diff goes to rest and C.H wor ks.
There are no leaks on D.H.W pipework and the differential assembly (complete) has been changed.
Any ideas ?