Can anybody help with this one. I have a heating / hot water system controlled by a Potterton EP2000 programmer with a Honeywell V4073A1039 3 position diverter valve. When the hot water system is operating the 3 position valve does not always revert to the correct position and allows hot water into the radiators. I have watched the 3 position valve and when this happens, the valve tries to move to the hot water only position but immediately goes back to the heating / hot water position and continually cycles between the two, on the microswitches.
Does anybody know whether it would be the controller that is at fault or the diverter valve?
Does anybody know whether it would be the controller that is at fault or the diverter valve?