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Ok, conventional S type heating layout, pump seems to be running 24/7.. Hot water and heating both off. Think pump is fed from birds nest of wiring in airing cupboard, prob not from boiler downstairs.
I'm guessing this might be a stuck 2 port valve on the heating side? Any other likely culprits?
Thanks,
Jeff
Posted : 28/10/2015 12:13 am
If it's a proper S plan, then it's probably a stuck microswitch in one of the heads
Posted : 28/10/2015 12:25 am
Don't know if the S-type, Y-type thing makes a difference, however some conventional boilers have a permanent live to the pump to circulate hot water after the system switches off, but all day is excessive! If it's this it'll be the boiler circuit board at fault
Posted : 28/10/2015 6:51 am