Recent content by smit

Its only when the store temp drops down to 1 that power is sent to the 3 port valve.

Hi can anybody help I'm having problems with my gbm 3 on some occasions when the thermostat clicks on the 3 port valve does not move across to give heating, the red led is flashing to indicate a demand for space heating but when i check the cable to the 3 port valve with a vault stick it shows...