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I use both and the one scatman recommends is the best. And it helps strengthen the wrists. There is a technique though -be careful and slow (that's what she said) or you can nip the copper pipe as well.

Hi Replace the valve or the valve actuator, 3-port valve less than £50. To test it's working turn the thermostat up and on the hot water cylinder. If it whirrs it's probably ok. If not replace. Good luck.

Ok, so if the boiler thermostat is at question but the hw and cw work independent of each other. So my quick fix is to connect the pump to an idependent power supply and switch it on when the ch is on. Is that acceptable?

so the thermostat on the boiler controls power to the CH pump? I've put power on the pump directly and it did not work I think it's kaput. But I am reluctant to change it 'till i sort out the power. I shall investigate further,

so the thermostat on the HW cylinder conrols power to the CH pump? I've put power on the pump directly and it did not work I think it's kaput. But I am reluctant to change it 'till i sort out the power.

Right, I done what you recommend Alfredo. Turned the CH and HW on. The lever on the valve (as i look at it) is to the left. I Turned the thermostat down not much happened. The lever is slack with no resistance. I turned the thermostat up the valve makes a whirring noise but the lever does...

Thanks guys. I've checked the live terminal on the pump and it's not live (after turning the CH on and turning the thermostat up and down). I'm starting to think it is the valve. It has a manual switch, which has been slack and moves with no resistance. Although now there is resistance...

Thank Alfredo, A fuller description of the system: Downstairs there is a Glowworm utlimate boiler and Danfoss programmer. At the bottom of the stairs is a Danfoss thermostat. Upstairs there is a Danfoss junction box with wires going to a thermostat near the bottom of a indirect...

I've not actually changed the pump. I thought it wise to quickly check the electrics before doing any plumbing. Turns out the live cable is not live when you turn on the central heating or turn the thermostat up.

Hi Wondering if anyone can help? My radiators are hot upstairs but cold downstairs. The pump appears not to be working. After checking the power before replacing the pump it has none. Can I wire the pump directly to the mains and switch it on and off manually? Thanks for your help.