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D_Hailsham Looks like you were spot on about it being the Diverter valve sticking. The situation I have now is as follows. When the Central heating is requesting to be on but the pump is not running. I have found that by tapping the diverter valve header casing a few times I eventually...

I have a potterton ep2000 programmer with a potterton roomstat. In the mornings I get Hot water and Central heating but in the evenings I get hot water and warm heating. It would appear that as long as the hot water is set to on, whenever the tank thermostat is green the pump runs. If the...