Pump running with just hot water selected?

[william chasney]

Hi, folks I'm new here so please be gentle with me! Sorry to introduce myself with a question. I have a problem whilst (only) the hot water is selected. Of late all the radiators heat up as well (not just warm to the touch), also the CH pump runs too, which I didn't think was right. It appears the two Honeywell (normally closed) motorised valves connected to the pipework in the airing cupboard "do something", either one makes a noise depending on whether CH or HW is selected. I have a basic understanding of electrics, but little of plumbing. The system was fitted some years ago, it uses an Ideal Mexico boiler.
Thanks in advance.

 

[Mbear]

Prob the heating zone valve is stuck on causing this issue, it may need replaced. The pump runs for both ch and hw so no issues there

 

[william chasney]

ok, thanks for your reply