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HI replace the cyl stat.it is probably stuck .

HI pressure when cold 1-1.5 bar when hot 1.5-2 bar.if the system is not treated chemically then try adding sludge remover then inhibitor.

HI boiler not big enough. 14 rads x average 2 kw (with heat loss etc )=28 kw boiler has to be atleast 32 kw .so you can not balance the rads.your boiler is working very hard to supply all the rads . FED UP OF COWBOYS ? TRY INDIANS .

HI I would agree with hootingowl.24kw is not big enough for hw and this diferrence can be seen in winter.

HI big house at least 22 rads pipes running into celing and into wall (done by someone else ) :(

HI wonder if anyone can help vaillant system boiler keeps loosing pressure.looses about 1.5 bar in just two days. 1.it is unvented system 2.new boiler only used about once a week (empty property) 3.no water leak visible at the overflow

HI secondary heat exchanger letting by

HI ch sensor could be faulty

HI hot water expansion vessel ?

HI could be many things 1.hw sensor 2.ch sensor 3.air pressure switch 4.flueways blocked 5.fan faulty 6...... :(

HI A picture would be good. :)

HI look in the manual or search internet for the manual.

HI Replace the filling loop. :D

HI easy. 1.regrout or fill the the gaps between tiles 2.remove the old silicone completely 3.use new silicone where the tiles meet the tray and i guarantee it wont leak. :D FED UP OF COWBOYS ? TRY INDIANS.

HI gazfen you should not give advice to others if you are not aware or the rules.wood is not allowed when is so close.

HI sorry but i prefer compression waste fitting before the cast iron soil pipe.

HI if fitting curved rail then the middle ceiling support is very important.i am pretty sure you will be able to buy any rail size from your local merchants.

HI did lots of these.most likely (if fitted) brass float valve in the loft .cold feed tank .

HI few months ago i did my fascia boards.and also cleaned my roof tiles but since then when it rains occasionaly water penetrates through and comes through bedroom ceiling. 1.there is no tiles cracked 2.it leaks where nails are through the felt 3.when i move the nail rain water seems to...

HI 1.is the control knob free ? damaged ? 2.hw sensor faulty 3.microswitch faulty 4.dhw diaphragm damaged all above common faults good luck