During a recent cold spell I thought I would try the central heating. It doesn't heat up. The house thermostat indicates that the heating should be on (flame icon) the central heating controller has an on light for both HW and CH. There is plenty of hotwater but the radiators do not heat up. Can someone help me diagnose why my CH is not working. I don't think the pump is running.
Centra Heating not working thogh Hot water is being supplied
- Thread starter Grubber
- Start date
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Dan, we need your crystal ball. I do hope it's not in for service. 
Dan, we need your crystal ball. I do hope it's not in for service.
Thanks for the ridicule; perhaps I've chosen the wrong forum.
sefton, pete is making the point that without some basic info like boiler make/model or name of the controller, it is a guessing game
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OK thanks. The boiler is a Gloworm Fuel Saver Mk2 (old) conventional boiler; the controller is a Towerchon QE1. I'm not sure how much this information will help. Further information is:
It is an open vented system. The motorised valve does not appear to motor with the controller CH and HW both selecetd to on and the house thermsotat temperature selected to high. The pump also does not appear to operate. The boiler has recently been serviced (this summer) and there is no problems with HW.
Hi Sefton, if you have either of these, I would suspect the little synchron motor has failed. Very common, but you need to do a few electrical tests to be sure. It's a lot easier when we know more about your system
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Yes Pete - I do have a motorised v/v exactly as you have illustrated. I operated the slave lever and latched it into position. Still no joy. I am suspecting the programmer.Hi Sefton, if you have either of these, I would suspect the little synchron motor has failed. Very common, but you need to do a few electrical tests to be sure. It's a lot easier when we know more about your system
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Simply latching the lever will not close the internal switch on either of those valves. That lever is for opening the valve to enable filling of the system. A multimeter is a must for diagnosing your fault. It's more likely to be the internal motor than anything else. Unless you are capable of doing some tests then it's not possible to be certain.
I have a multimeter and I am capable of doing some tests.
Which valve do you have, 2 or3 port? A picture would help.
Hi Pete. It is a Honeywell V4073A 3 Port Motorised Valve.
With a meter, you need to test for power to the white wire of the valve. This is easily done at the wiring centre.
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