Yesterday, my central heating system switched on whenever I switched the hot water on. The indicator lights on the programmer only shows the hot water as being on. Now it's happening all the time, if the hot water is on so is the central heating. I have changed the programmer (assuming it was faulty) but it has not made any difference. Any advice gratefully received.
Help! Central heating comes on whenever hot water on
- Thread starter nevill5
- Start date
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You will have a rotating valve on the CH side, very possibly on the HW side as well, although this need not be so.
The valve is driven by an Actuator ( small electric motor ) which rotates the valve to both switch on the CH and open the CH valve. I suspect the Actuator has stopped working or the valve has stuck - or too tight to move (should be possible to rotate with fingers), and when the HW 'sensor' switches 'on' to heat the tank, as the CH valve is also open the water will also travel to the radiators.
Look for a box with a cable sitting on the pipework which will be sitting over the valve.
Disconnect - you can leave the valve in closed position (turn across pipework with fingers if the valve is OK) - and take the Actuator to replace.
Hope this helps
Doug
The valve is driven by an Actuator ( small electric motor ) which rotates the valve to both switch on the CH and open the CH valve. I suspect the Actuator has stopped working or the valve has stuck - or too tight to move (should be possible to rotate with fingers), and when the HW 'sensor' switches 'on' to heat the tank, as the CH valve is also open the water will also travel to the radiators.
Look for a box with a cable sitting on the pipework which will be sitting over the valve.
Disconnect - you can leave the valve in closed position (turn across pipework with fingers if the valve is OK) - and take the Actuator to replace.
Hope this helps
Doug
DIYnot Local
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