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Boiler losers pressure

Why is my combi boiler losing pressure in ch mode I have to top the pressure up every two days
I can not find any leaks in the system

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  • pete Jan 11, 2009

    I have worcester Bosh 24i, when the heating is on the pressure reachs 3 when I then turn it offthe pressure drops to well below 1. So I refill the system back up to just over 1 but the same again.I have looked for a leak but can noty find one.

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Make sure the heating is off and rads are cold before checking for leeks if pressure still drops chech expansion vessel is charged to 1 bar.

Posted on Apr 01, 2009

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1 Answer

If my vaillant eco tech combi boiler intermittently loses pressure does it mean I have a leak in the system somewhere


It could be have you bleed the rads of air . check the pressure relief valve it may be passing water .

Dec 07, 2016 | Heating & Cooling

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Ideal response combi boiler model 120 loud vivrating / high pressure/ zero pressure


the low pressure issue is most likely the expansion vessel needs repressuring because the valve has leaked and is not seating properly so causing water leak outside.- with the pressure on zero, drain about 1/2 bucket out, mine had a exit tap near the inlet tap, then attach a car pressure gauge/ pump to the top of the orange exp vessel. pump it up to about 1.5 bar, that should do it..you may have to do this 2 or 3 times..
re loud rumbling sound, mine had this too, and at around the same time ! heres how to fix it..
BGas engineers are lazy, and unless you watch em like a hawk they lie about changing a part...mine had this loud noise problem and its caused by the gas being deflected out, because it has not been ignited by the spark electrodes, and the rubbish boiler doesnt detect this quick enough, so some gas gets out ..You may be able to smell some gas too. The cover is supposed to stop this, but it dont.

with power isolated, all you have to do is carefully remove the fan, and then the burner, and then dry it, clean it, and adjust the electrodes, 5mm gap between the pair of spark electrodes, and 7mm gap to the cone. and 7mm for the sensor electrode. Mine had a bit of water, i think its from the condensation coming back down the flue ? because the exchanger looked ok.

Also be careful of knocking the sensors and wires, and also check if these are ok as well.
This is a very common issue and nobody tells you

Oct 06, 2012 | Heating & Cooling

1 Answer

I have an ideal standard he30 boiler instaled about 6 weeks ago. the boiler keeps losing presure about half a bar every 2 days if i dont top it up it will trip the fuse on the fuse board acording to the...


All the combis I've come across merely fail to fire if the pressure is not up. not only do they not fire, nothing else works including the pump and in any event the pump should not overheat just on low pressure.
water loss - try turning off the valves on the flow & return pipes [3/4 inch ones] 1 valve per pipe . This will isolate the rest of the system - rads etc Note pressure over a time period. In this mode the hot water circuit will still work but do NOT use the heating circuit
1/2 bar over 2 days is not serious but it should be found
Once you have either mended the leak in the rest of the system or found there is not one, insist on a replacement boiler
In any event having looked at the reasons given for the fuse blowing, I would definitely get a replacement.
These problems should not happen on a new boiler
I list Worcester.-Ariston-GlowWorm-Ideal- and many others who would confirm this

Dec 24, 2009 | Water Heaters

1 Answer

Hi There, I have an Ideal Response 120 Combi Boiler. Each day the water pressure falls to 0 on the pressure gauge. In order to get hot water and Cental Heating I increase the pressure to 1.5. The Hot water...


I have the same boiler with a similar issue. The water is more than likley leaving the system from the pressure relief valve, which will be routed outside. It sounds like you have lost the pressure in your expansion tank, which is inside the boiler. With the boiler pressure at zero and the power isolated, the expansion tank can be accessed from a panel at the top of the boiler on the right hand side. You will see a valve on the red expansion vessel like the one on a car tyre and can be pressurised with a car tyre air pump. I think from the manual the pressure should be about 1 bar, but it depends on the length of pipework on your system. A competent boiler engineer should be able to sort this out, but it may be that your valve is leaking, or the expansion vessel has failed and the problem will occur again.

Nov 10, 2009 | Honeywell CT87B ROUND HEATING&COOLING...

1 Answer

I keep having to top up with water every few days, but no leaks to be found, the pressure drops down to less than one and the boiler turns off, please can you help,


what kind of heater combi? if combi you may be pressurising boiler to high ie over 1 bar boiler may be blowing off through release valve check discharge pipe

Oct 28, 2009 | Water Heaters

1 Answer

Boiler loosing pressur


generally preesure problems are caused by the following- obviously a leak, bleeding of rads without topping up the pressure, pressure relief valve passing( probably an integral part to the boiler), or potentially a problem with the expansion vesell.
the expansion vessel is a tank which
holds water and air- it should be pressurised with air by about 10 psi or up to 1bar, if the diaphragm has split this ill cause pressure problems all day long

hope this info helps

Sep 17, 2008 | Combi Centre DX - Mango

2 Answers

Ariston combi boiler


sounds like your diverter valve is passing on the boiler, this diverts the heat either to the rads or to the taps, if its passing through the heating chanel it'll heat up the rads- may also be a scaled up secondary heat exchanger, hope this helps you

Aug 21, 2008 | Combi Centre DX - Mango

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