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Plumbing how do you drain down combi central heating system. i want to replace old bathroom radiator with towel radiator.

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  • Anonymous Mar 24, 2014

    no water or heating switched boiler off

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You -do not have to drain completely- respond and I will guide you through it -expert at this

Posted on Nov 02, 2008

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Posted on Jan 02, 2017

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Niagara delta 30ff combi boiler, 13 years old. problem when the hot water for bath heats, the radiators in the house also starts heating, even after central heating thermostat is switched off.


sounds if your zone valve isn't closing off and the circ pump runs all the time ?? ck to see if zone valve gets power all the time or only when thermostat calls for it , if power is only there when called for then your valve is bad (common)

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My central heating turns off when i turn the hot water tap on. when i turn it off the central heating doesn't come back back on until i turn the power off and on.


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Combi-boiler-turn hot water tap on/off and the heating stops for 20secs ... hot watertakes priority over central heating so when you run the hot tap, heating is ... Yeah onmy worcester combi there is a diverter valve - it feeds either the heating or ...

My central heating works but I have no hot water - 24'7 ...

https://www.247homerescue.co.uk/my-central-heating-works-but-i-have-...
Diverter valves switch heat between the hot water and the central heating. When youturn your hot tap on, the diverter valve temporarily shuts off the water supply ...

Does your boiler keep switching itself off? Here's why ...

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Jul 7, 2015 - ... Bathroom Suites, - Showers, - Wet Rooms, - Taps and Accessories, Information and ... Low water pressure can cause your boiler to turn itself off. ... boiler is not turning off, you aren't getting the amount of hot water you require. ... If there is air in your central heating system, then your boiler may shut down.

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1 Answer

Had to turn off boiler


I would contact the plumber and have him fix what he broke. I feel when he drained the system he has the responsibility to blead it and get it back to proper operation.

Mar 24, 2014 | Water Heaters

1 Answer

Central heating boiler will not heat heating water


first do not call engineer go up in loft if there is a lot of insulation in loft have some boards to lay down in loft you will have two water tanks one large and a much smaller one look inside the smaller one and if the ball valve is stuck in the upright position and no water in tank move ball up and down water should flow wait for tank to fill then bleed radiators with a small key obtainable at most diy stores for this you will need a small towel with key hold towel under valve loosen the screw at top of radiator air will escape then water will escape do this to all radiators repeat this a second time so only water comes out turn on heating system also there is a chance you will have to turn down heating system

Dec 02, 2012 | Water Heaters

1 Answer

I have a Biasi Riva Advance HE Combi Boiler. The pilot light and fan dont seem to be working, I can hear a click when I run the hot water tap and a click after I turn tap off,


Have you bleed the air from system and run hot water and heating at the same time , bleed the pump . you could have air in the pilot after turning it off

May 01, 2017 | Water Heaters

2 Answers

Problem with hot water from Vokera Excell 80sp boiler


Hi - hope someone can help. I have a VOKERA EXCEL 80SP combi boiler and been without hot water/central heating for two days. The pilot light is on, the fan is on, but boiler not triggering once the hot water tap is turned on.
Hopefully someone come to look at it today but hoping for some advice. Anyone else had this problem?
Thank you.

Dec 21, 2009 | Water Heaters

1 Answer

Bled radiator and now boiler is losing pressure


if your boiler is a combi re-pressurise locate filling loop and refere to manual

Oct 09, 2009 | Water Heaters

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.

Jul 10, 2009 | Whirlpool Aquatic Millennium VII -...

1 Answer

Boiler keeps losing pressure when the heatings off


Hi Leehardcast,

Yes the problems are related. The system is low on water. So now instead of water you have air in radiators which is easily compressed when it heats up. Then pressure loss when it cools down.

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

Please rate this response and Good luck, Phil

Jan 13, 2009 | Watts 3/4 Pressure Relief Valve

1 Answer

COMBI BOILER /CENTRAL HEATING


the boiler should modulate to controll the radiator temperature but the central heating will go off whilst you are drawing hot water

Nov 13, 2008 | Water Heaters

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