A customer was complaining that their central heating was coming on with the hot water even though the heating was turned off and down. They usually set the central heating to come on an hour after the hot water but the gentleman had gotten up earlier than usual to notice that the radiators were hot.
The system was a three-port motorised valve set up and had a Drayton MA1/679-3 valve. I set the hot water to come on and could see from the indicator on the valve it was in the middle position for both the heating and hot water. I removed the head from the valve body to see if the spindle had seized or it was a problem with the head. I have had the same issue previously where there was an unusual amount of rattling coming from the valve head. I didn't bother to open the valve head as I knew that both the return springs would be loose in the head, and that both of the plastic lugs that the springs attached to had broken off also. I replaced the head of the valve and the system was working as it should be.
Disclaimer:
The works described in this blog are a record of work undertaken and should not be taken as guaranteed to solve your problem.
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