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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...

Thank you for reply. I'll see what spanner access there is when it's cold. Are they tight to get out because of scale? (I'm in a soft water area.) And do you use anything on the threads on the new one? I'm a bit twitchy now but if I do it, I'll make sure everything's water protected. I assume I...

I want to change the three automatic air vents on my Grant Vortex 26e oil burner, as all are leaking to some degree. I'm thinking of keeping it off for a couple of days so dead cool, reducing pressure and shutting off the blue isolating valve and cold inlet at back, then diving in. Any thoughts...

I'm no plumber but I think it'll be fine. However, the gap around waste does seem a bit wonky.

Good call! Thank you. :-)

My 'inner' light switch turns on the 'outer' light and vice versa, so it's intuitively wrong. I guess it's a case of just swapping top and bottom load connections, but is it L1 and L2 or L1 or L3, or something else!? Thanks in advance!

Light fittings