I have a customer with a Halstead Best 40 that is fine for DHW but the rads are only luke (if that) warm. I think it is the diverter valve that is causing the problem. I can hear the micro switch working when switching on but cant tell if its engaging. There is a lever on the side. Can I use this lever to turn on the heating? If I can and the heating works I will know that it is the DV or synchro valve that needs to be replaced.
Any advice will be greatly received.
Any advice will be greatly received.
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