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I have Netaheat 16-22. Recently when I set it to water on only the upstairs radiators come on even though the central heating thermostat has not clicked on. The downstairs radiators don't come on and the central heating seems to be working okay.

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  • Heating & Co... Master
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Check out the pump see if it is working , or has air in it , sounds like the pump to me

Posted on Sep 29, 2010

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My Baxi Combi 80e boiler turns the heating on randomly. With the wall thermostat turned down and even with the boil switched to hot water only the heating still fires up when unwanted.


If the thermostat wire run passes anywhere through, beside or inside any metal surfaces and the wires touch any of the metal its the same as if you turn the stat to on. I've seen this a few times. Easiet way to detect it, if its inside the house is at night in the dark. Look around when its doing this you may see the small spark when it goes on. Otherwise you will need to inspect the entire run from the stat to the untis, etc.

Jun 23, 2014 | Heating & Cooling

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Have oil heater that we had serviced yesterday. Heater stays at temperature but circulating pump will not send heat to upstairs radiators. (heater in basement) Any advice?


Try putting in central heat and air in your house don't rely on some basement heater then you will have a basement heater for when it get cold

Dec 03, 2013 | Lakewood Oil-Filled Electric Radiator...

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ENGLAND, UK. DOMESTIC HOUSE CENTRAL HEATING. Baxi Bermuda


try bleeding the radiators in the order of downstairs first and then the upstairs and try to bleed them in the order they fill, trapped air can take a while to escape, a good sign on a radiator is the bottoms being warm where the tops( where the air is trapped) stays cooler, a sure sign to which radiator needs bleedin, hope this helps, colin

Apr 02, 2010 | Heating & Cooling

1 Answer

My round Honeywell T-87 on the main floor(middle) of the house has no ON/OFF switch. It controls the temp of that level of the house and even though it is set at 60, the temp is way too high and reads 74....


What you are describing is the Heat Anticipator. It is a small resistor that helps the thermostat from overshooting the set temperature by heating up and shutting off the thermostat just before your set temperature. I don't think that is related to your over heat. 14 degrees is a lot and the Heat Anticipator will only effect it 4 or 5 degrees. I would remove the thermostat and check if there is a call for heat. If so, you have a shorted wire. If not, replace the thermostat.

Dec 30, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

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).
then fill system up and repeat balancing.

www.jollygreenplumbingmachine.co.uk

Dec 26, 2009 | Desa International CBN30T Central Heating...

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

High Electrical bill - Appears to be heatpump problem.


Sound like there are running on emergency heat which is elrctric.Have the system checked out buy a local heating and cooling company. Have they checked the filter and changed them.

Jan 14, 2009 | Honeywell Electronic Programmable...

1 Answer

Central heating


or put it on frost setting if you can take head off spray with a little wd40 around needle and put head back on with head at max then turn down to frost or 0

Mar 01, 2008 | Honeywell Programmable Thermostat Heater

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