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Guys thanks for all the replies. I am going to drain it down and swap that valve. Will let you know if that cures the problem.

Normal cylinder operation with the valve situated above the pump. The controller is a Drayton Lifestyle LP522 and is a brand new replacement for the exact same old model. The valve is a tri port as previously described and the boiler is also noted in the previous post. So the rads get hot...

I replaced the controller with the exact same model

The boiler is an Ideal Classic NF60, regularly serviced and works fine. The valve is as described previously. The heating pump is fine too (only a year old) and this started happening (the rads heating up when the water is on) about 4 months ago. The owner had been stacking household items on...

When I turn on the HW I get hot rads too. New controller did not fix problem, boiler is OK. Any pointers welcome...