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dead mouse under floor :?: but take your dirty pants off them rads for a start :wink:

short length of thin plastic tube run to a point bellow pipe level, suck hard; syphon. Or introduce tube far into pipe and blow hard.

claim discrimination or sexual harrasment.

is the bath mixer tap a thermostatic mixer :?:

OK then.....Cambabest....south birmingham......haggle, I think they do Vaillant

online for a baseline then your local plumbing shop

plastic pipe buried in the floor screed or the wall?

I guess you are able to bleed air from the rads ok ? If the valves are thermostatic check that with the thermo head removed the pin is free to move down (push with the flat of a spanner etc), they can get stuck. if it is micro-bore pipe it might be blocked if the rads are not heating even...

close down the lock shields on the upstairs rads and water cylinder (count the turns so you can put everything back as it was) and see if the downstairs rads will heat even in this condition. Is the system microbore from manifolds? Is the problem getting worse? Is the existing pump...

before taking up the floor I would pressure test the pipework with a hydraulic pressure tester to be certain the underfloor pipe was leaking, these can be hired. With some "bits and pieces" you could access the pipework at the one end with the radiator and cut into the pipe to fit a stop end at...

If you can fix a problem with a pragmatic approach like that then I reckon the guy would succeed at any trade. shame for Nick the dentistry trade dosen't pay the way it used to.

16mm to 15mm straight couplers, I have some of these I'm sure I obtained them about 2 years ago on a job were I used them to covert from some old imperial copper pipe to modern 15mm.

read a diy book plumbing section first. The answer is can you isolate the water supply on both the hot and cold taps. Sometimes this can be an ordeal in itself (old valves not working etc). If your prepared to use a bucket to flush you can remove the toilet cistern, I would avoid touching the...

why not cut out the back of the unit if its only hardboard, replace with plastic pushfit. Lube the copper with food grade silicone.

sounds like the cold mains supply is running at this time so perhaps reducing the cold pressure at the boiler "cold water inlet" and forcing it to shut down.

from memory: Nut; o-ring; olive(flat end facing o-ring);main fitting

thanks, just interested to know :)

if they both have thermostatic valves then the symptoms would make sense. I would start by trying to get them both hot when each has the thermo valve set on max or even better the thermo head removed. I would alter the lockshield valve on the new rad until it gets hot.

I know nothing about gas but how can u purge a pipe system were a branch is capped off ?

have you opened the gate valve to the hot water cylinder. there could be an airlock in the coil in the hot water cylinder. Try opening any manual air vents on the cylinder piping.