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Thanks for prompt reply - so you think the valve needs replacing? When the heating does not work the motor is hot to the touch - more than warm.

I'm experiencing a problem where the HW system is fine but CH sometimes stop working and rads get cold. This mostly happens when it is cold outside and therefore the CH is on for longer. You can get the CH back on by turning on HW and increasing the HW cylinder thermostat. The motor for the...