Heating Coming On With The Hot Water

I had to look at a system where the heating was coming on with the hot water even though the heating was turned off and down. The system was a three-port motorised valve set up and had a Drayton MA1/679-3 valve. The valve was stuck in the middle position as I could see from indicator on the side. I removed the head from the valve body to see if the spindle had seized or it was a problem with the head. The spindle was free, but there was an unusual amount of rattling coming from the valve head. I opened the valve head and both the return springs were loose in the head. 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. Work should only be carried out by persons qualified and competent to do so.