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Need wiring diagram to include: Underfloor heating downstairs (wet system,polyplumb) combi boiler for the heating and hot water

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  • wj_electrics Oct 30, 2008

    Underfloor heating is:master 4 zones PB1ZP(polyplumb)



    Combi boiler is:BAXI,Duo-tec combi HE

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Please mention model number of the Air Conditioner?





Posted on Oct 30, 2008

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Hi,
could you provide the exact model number or the product you need the wiring diagram for



Thanks
Proton

Posted on Oct 30, 2008

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How do i connect a standard room stat to my combi boiler


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I have a Vaillant Combi boiler, recently serviced by British Gas, given all clear. Problem we are having is the downstairs hot water tap it is a mixer tap, the cold water is fine but the hot water is


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To get heat downstairs i have to turn raiators off


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I can only get heating to the radiators upstairs, not downstairs


balance the rads.
upstair radiators turn all valves off,heat will then divert downstairs,open valves upstairs 4 turns on locksheilds and number 4 on trvs if u have any.
then if that does not work get a combi or powerflush.
if u cant afford then drain a little from rads,get x300 sludge remover from plumb shop and put in header tank(not hot water tank).
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www.jollygreenplumbingmachine.co.uk

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1 Answer

Radiator heats up when running a shower.


Your boiler is overdue for a service.

Combi boilers are unlike regular boilers in that they have quite a few moving parts, it's vital that these are serviced annually if you want the boiler to remain reliable and to avoid expensive failures.

In your case, the diverter valve has most likely failed. Normally, when the heating is on this senses when there's a demand for hot water and temporarily diverts the primary hot water circuit to feed the domestic hot water heat exchanger. When the demand for hot water ceases the primary hot water circuit is diverted back to the central heating heat exchanger. The valve has a number of moving parts including a rubber diaphragm which can wear out and split and moving shafts which can seize.

When the valve fails it can leak and also can divert hot water to the central heating heat exchanger when hot water is used. The reason that only the highest radiators in the system are affected is probably because the failed valve does not necessarily cause the central heating pump to activate and circulate the hot water throughout the system (it does on some boilers though). If hot water is introduced into a cold heating system it will rise via convection to the highest points in the system like an old fashioned gravity circulation system which was unpumped.

Call a heating engineer out as soon as possible; I'm not going to advise how to do the repair yourself as gas appliances MUST be serviced by qualified persons only for reasons of safety. If you're lucky then the valve simply needs cleaning up and a few new diaphragms plus other minor seals and rings. If it's gone too far then the valve and possibly the manifold it's attached to will need to be replaced.

In the UK the part alone typically costs between £100 to £200 depending on whether it's just the valve or the manifold as well. The diaphragm kit typically costs up to around £15 and is routinely fitted when the boiler is annually serviced, and a new valve will already have new diaphragms fitted. For a routine service expect to pay for up to two hours labour (many can be done in one hour), but if the valve/manifold have failed it will be longer as one failure often causes other parts to need further inspection/repair.

I hope that I've helped you today, if so please return the favour by rating my answer.

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Add some water to your system until you have 15lb pressure and bleed out upstairs radiators at the same time.

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