Central Heating won't come on by itself


Postby SHAWKINS002 » Thu Aug 16, 2007 7:01 pm

Hi

We only seem to be getting central heating when the water is switched on. It does not come on when heating is selected, and yet even when heating is switched to off, it still comes on when the water heats up. Where should I look for the problem - is it likely to be the programmer? It's quite an old Honeywell, digital (just).

Thanks
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Postby htg engineer » Fri Aug 17, 2007 1:30 pm

If its gravity hot water then you will not be able to have central heating on by itself, I take it you used to be able to having heating on by itself.

So, its a problem with the actuator or three port valve. This will be in an airing cupboard or near the boiler. Check the motorised valve is working and that the spindle on the valve is free to move.
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Postby SHAWKINS002 » Fri Aug 17, 2007 5:46 pm

Thanks very much for your help. I have a drayon mid-position actuator, BGMVSP-23. The black plastic switch appears to be moving when the CH is called, but I am not sure if it is moving freely. The CH doesn't call the boiler to ignight, only the HW. I think I will call my plumber - would you expect that to be an expensive fix?
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