I have a combi boiler. the pressure keeps going down every day despite filling. even when the pressure is ok i find that the water system does not work. the central heating works fine. there is no obvious leak. and no obvious build up of air in the system. can anyone help. can i fix the problem? thanks
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you have a leek prop under groud. feeding house.
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.
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??
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
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
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.
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!
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.
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