Comments on: Combi Boiler Problem – Pressure keeps going down everyday?

By: Lilyana Amin

Lilyana Amin — Mon, 11 Jun 2007 12:49:10 +0000

the obvious thing is a leak have you checked all the joints .the boilers internal pressure regulator might be leaking there should be a bleed nipple on top of it if that’s the case it will have to be pressurised again to manufactures spec is pressure relief valve leaking and dribbling water outside

By: Cole Brady

Cole Brady — Sun, 10 Jun 2007 22:09:31 +0000

If you don’t notice a leak anywhere then it could be serious.
You might have to get a heating engineer to find out where the water is going to.
When you are at it get inhibiting fluid put into your system after the cure. FERNOX is good (It won’t cure the leak) but it will prevent rusting.

By: Joey Edge

Joey Edge — Sun, 10 Jun 2007 14:51:45 +0000

You should have a vent pipe from boiler to outside, generally terminating just above floor level. Check that this pipe is not passing water (should see it on the path/soil outside).If not you may have a leak on radiator pipework underfloor, either way you should be looking for water!

By: Chance Farrow

Chance Farrow — Sat, 09 Jun 2007 19:17:02 +0000

Definetly losing water. Have expansion vessel checked and PRV checked. Could be heat exchanger leaking into insulation pads (hard to spot). Hot water problem doesnt sound related. Need to know more for further advice. What model, maker etc.

By: Nevaeh Appleton

Nevaeh Appleton — Sat, 09 Jun 2007 17:35:06 +0000

could be a lot of things – also depends on the make and model of the combi. Check out the link below – it answered the problem I had with my combi

By: Jake Park

Jake Park — Sat, 09 Jun 2007 08:03:06 +0000

this sounds like a regulating valve problem. this valve controls the hot water demand as opposed to normally feeding the heating circuit. Had a similar problem a couple of years ago.
The valves can be tricky to get out, but the seal kits can be purchased from most trade suppliers. mine was eleven pounds.
Good luck

By: Jaiden Brookes

Jaiden Brookes — Thu, 07 Jun 2007 10:53:45 +0000

it sounds like the pressure is falling below 1.5?

you fill up by turning the “black” tap pressure goes up?

over 24hrs pressure goes down?

my question ……….down to what??

By: Adriana Gibson

Adriana Gibson — Thu, 07 Jun 2007 03:35:33 +0000

You have definitely got a leak and it must be obvious, the usual place where it is not noticed is a faulty bleed valve. The water runs down the side of the rad and drops to the carpet, feel the carpet under the valve for wetness.

By: Ruben Hancock

Ruben Hancock — Fri, 01 Jun 2007 20:17:18 +0000

you have a leek prop under groud. feeding house.