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Thanks both. Fixed now. (Pump).

Hi and no. I didn't want to start opening control panels and/or removing and inspecting the pump without a replacement. I know there's a slight chance I'll stumble across a fix, but would much rather stick a new pump on and forget all about it.

Hiya and thanks I tried it again and it overheated in about three mins. Hot water flow is very good (although it's cold!) Is this the pump and is it a direct swap? I wondered if it was too powerful. dhw pump

Morning and thank you. I'm told the pump's obsolete and can't speak to Wilo or Grant either as closed for Xmas... Have you a link to the pump you use, please? I'll order one.

Hi and thanks for reply. I ran it for three mins and all the chromed pipes, exchanger and pump itself were cold. Top outlet at boiler was warming up, which I guess you'd expect if the boiler's ignited. Turned it off again as figured it would overheat again. I ran the hot tap for a couple of mins...

Thanks for reply. I can feel the pump spinning but have read the impeller can become detached! Also that the pump's no longer available. Is there any point in having a look inside without a replacement to hand?

Runs for eight mins or so from cold, but can't feel any heat to heat exchanger, then overheat cuts in and boiler starts making rude noises until it cools. Pipes at top are hot. Pump? I've seen a non return valve mentioned, but where is it and how do you test, or is it in the pump? Heating works...

My loft is boarded down the centre, which corresponds to being above the long-ish hallway. Here it has, maybe, 50-75mm insulation under the board. Would laying a couple of rolls on top of the boarding help with heat loss? I need it boarded, so don't want to pull it up.

No, it has an 'ear' which you press in, then you push pipe on, let off ear and it's locked - a thin plastic o-ring/seal makes the connection. They use them on the diesel circuit too. The pipe is hard plastic also.

Don't ask why but I want to give a 'push fit' heater coolant connection on a thermostat housing a little bit of help on a Peugeot vehicle. I have silicone, Fernox Water Hawk jointing compound and silicone grease. Any thoughts on best choice? TIA!

Why?

I'd go both.

Check the life assurance?

Thank you both. Problem sorted now. :)

I changed the bath taps for a mixer type and stuck the old bath taps on the basin, as they suited the size of the basin better. However the hot tap if turned up creates a terrible hammering from the pipes. Cold is fine and flows much much better. I wondered if there's some carp in the tap. Are...

Yes. Leave heating off for a couple of days. Is the leak back?

It'll probably leak again when cold.

Don't want to replace valves as just carpeted but hadn't thought of a washer. Will investigate! Cheers. :-)

These are weeping from the cap where the Allen screw is. I've tried a couple of wraps of plumber's tape but they still leak a bit. Can I use general purpose silicone on the threads or do I need a fancy Fernox/plumber's thread seal type compound? And/or any other ideas to stop the weep? Many...