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It’s a potterton one but not sure of the model. I’ve added a photo of it. I’ve got a self ranging multimeter.

Boiler works ok when heating is on at the programmer but as soon as I call for heat at the room thermostat the boiler then continually comes on for a couple of minutes then shuts down and repeats doing this until I turn the room thermostat off. Thanks CBW & jackthom for your replies

Heating only-constantly fires up Heating/hot water-constantly fires up Hot water only runs normal. Could it be the programmer?

Just realised I only get this problem when I put the c/h on. As soon as I stop demand for heat the boiler works ok.

Cheers CBW, I’ll check it in the morning. once again thanks for your help.

How would I test the microswitch or should I just replace the head.

Thanks for the advice CBW, re posted on the plumbing/heating forum.

I have a potterton suprima 40 which constantly fires up every few minutes. It flashes green for 2 minutes, flashes red and green for 10 seconds then fires up. The boiler stays on for a couple of minutes then the process starts again. I have hot water and heating so could this be a faulty boiler...

Thanks for the reply. Yes, sorry but didn’t realise as I’ve just joined the forum and it’s my first post. I’ve pulled the lever over on the 3 port valve and it moves back, so I think it’s working ok.

I have a potterton suprima 40 which constantly fires up every few minutes. It flashes green for 2 minutes, flashes red and green for 10 seconds then fires up. The boiler stays on for a couple of minutes then the process starts again. I have hot water and heating so could this be a faulty boiler...