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Boiler pressure loss when off, returns after 30 mins on

VAILLIANT 3year old boiler.loses pressure when off, switch heating on pressure returns to normal in 1/2 Hour.

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  • John Harrison Nov 27, 2013

    No longer have a problem, Just found out it goes away, when next door goes out,( He very recently lost his wife after 60years together ).

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  • Master
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Wow, Im sorry I have no idea what you are talking about. but Im glad you no longer have a problem.

Posted on Dec 07, 2013

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my heat line capriz 25 boiler is flashing that i have flam or gas falure and has stoped workin? what do i do?

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SOURCE: Hi, my ideal c24 mini

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Alpha cd28c boiler loosing water and pressure through pr valve when heating is on,and when then switched off needs repressuring to use heating again.no obvious leaks.new pr valve been fitted.pressure


I assume losing pressure through the PR means Pressure Relief Valve (PRV) or temperature pressure (TPR). Open in TPR may mean boiler is overheating/overpressurized. Open in PRV means the Pressure Reducer/Fill Valve in the fill line of the boiler is broken.
House Water Pressure in a home is 30/40 PSI min to 60-80+PSI max.
Boiler PRV/TPR are set at 30 PSI open (SYSTEM PRESSURE) so too high a house water pressure will open the PRV/TPR. Replace the reduction regulator on/in the fill valve assembly

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Ravenheat 80/20 boiler. the boiler looses water pressure but only when working in central heating mode. Boiler holds pressure indefinitely if central heating is not used,hot water can be drawn without a...


Hi, your boilers pressure should be holding 1.5 bar with the relief set about 3. If the pressure is below this the flow switch will cause the boiler to stop as theirs not enough pressure to operate. Another thing, does your boiler have an auto fill system or do you need to plug a hose in to fill it? If its an auto fill system and you lose pressure you could have a leak.

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is the boiler a combi if so have you checked the pressure. it needs to be at 1.5 bar 2 bar at the most . also check that the heat the boiler is producing is completeing the circuit on the heating if you have access to the pipe work there should be 2 or 3 22mm copper pipes. now turn the heating on and check which one is getting warm. the one that is is your flow and in about 2 to 3 min there should be one more pipe getting hot let me no if this is the case

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Loss of pressure in boiler, no obvious leaks, water pressure switch changed plus pressure release valve


Check that your make up water is on.

Make sure your fill valve is working but it sounds like it is not. Your min pressure should be 15 psig. on the boiler. Fill valve will maintain a15 psig on the boiler. Water and pressure does get out of the boiler when radiators are bleed. When fill valve is not working people will keep bleeding the radiators trying to get heat but only lowering the boiler pressure with no water make up.

Make sure your boiler is getting water and has pressure when running.

If it isn't...SHUT DOWN and have a professional look at it.

Pressure relief valve is factory set ta 30 psig and opens when pressure is above 30 psig. This is a safety valve.

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Thier is no hot water running but boiler central


check diagram in instruction booklet,it will guide you.
if not mail me and i will go through it with you

jollygreenplumbing@hotmail.com

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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

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