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Its not a combi, you turn water only on the programmer. If it wont do that then its the motorised valve as he said.

Brackets have to be secured to bath battens and the fixed to the wall on one side and the end. A frame is needed to take side panel and make edge more secure if it is sat on or stood on. the feet have to be screwed to the floor once bath is levelled.

Following up from brassedoff It sounds as if the gland seal on the valve spindle was leaking. This would show itself by leaking from the small round brass spindle just above where it is going into the body. If the plumber has repacked the spindle with ptfe tape it wont leak until someone turns...

The shower should have a shallow trap under it. This will allow enough water to be left in the trap to stop smells coming up it. If the water is being sucked out by another piece of sanitary ware like a sink emptying then that will cause the smell. you need to check for how the waste water runs...

110 is smallest so should really reduce since there is a risk of a bottle neck blockage.

Or may be caused by the pump being put on the wrong way round, make sure the flow pipe on the boiler is the pipe that gets hot first when boiler switches on.

You need to get someone to look at it the picture you show is called a tundish and it means the pressure relief valve is discharging may be faulty valve or pressure to high or expansion vessel needs the air in it re pressurising, you also have a motorised valve that is not working properly.

Try changing it, the washer may be weak.

You must have a bypass loop that tees off the flow pipe between the pump and the valves, and then it goes to the return pipe on the boiler. It should have an automatic bypass valve on it but it probably has a gate valve with a red wheel, try closing it and see if that helps, if it does then the...

By pass loop is letting water through and that is more time consuming for me to answer, when boiler fires up before it switches off is the return pipe to the boiler getting hot when it should still be cold?

Turn off the water to the ball valve, remove the large knurled nut, inside there is a diaphragm washer, replace it with a new one for about £.50 and jobs done, easy to repair old style, not so easy to repair fluid master. Buy a new washer first.

You may have an air lock in the top flow pipe to the cylinder, if there is a manual vent on the pipe, open the cap half a turn let the air hiss out, when water comes close it and it should be ok, as long as the motorised valve is opening for hot water. If it is a 3 port valve it will be open by...

It is best to drain from the ground floor tap 1st if you have turned off a gate valve (red wheel) then they are not reliable for turning water off completely. You may need to put a rubber tapered bung in the cold outlet to hot water situated in near the bottom of the large tank in the loft. You...

Yes can do always check thread compatibility 1st, by testing nut on new one.

Have you looked at page 39 of the manual, fault finding chart for hot water?

Repost once a fortnight and you may get lucky with one of us scrapping one, I did 18 months ago.

Change the radio stat to a different one.

Check expansion vessel air pressure is 3/4-1bar with zero pressure in the system. Have you got too many rads for size of expansion vessel?

As Dan said we need info, like is a combi or open vented, is it fully pumped open vented or gravity hot and pumped heating. Have you got a programmer or not. Get the idea?

Phone the water board, they will check it outside, it has to be a minimum amount, and there may be an external leak causing it. Its a free service.