combi boiler issue - losing pressure. Help!

[thelightsareon]

I left the heating on overnight last night because it was really cold. I left it on 10 degress on the thermostat.

this morning it is losing pressure - I've had to top it up twice as it's gone below 1bar. It's going so fast that I can see the gauge dropping.

I'll be phoning plumbers on Monday, but I doubt they will be out to see me very quickly (v snowy outside and village is currently cut off!).

Can anyone offer advice? is it a leak somewhere? is it the cold weather? should I just keep topping it up until I can get someone in to look at it?

Sounds like a leak - probably caused by a frozen pipe, DH is an electrician and he says the safest thing is to turn it off. Have you got any halogen or electric heaters you could plug in for now?

we had this, short term keep it topped up. as I recall the problem was a leaky valve with ours.

Make sure you get yours seen to by someone who understands the model though. we had a couple who didn't so it wasn't sorted until we got someone who did know the boiler, as such.

I've got a heater I can use instead.

Bugger. There's me thinking that keeping it on low would prevent frozen pipes. Damn.

then again, if it is a valve, maybe the pipes aren't frozen.

thanks for the help!

just to warn you- DH is living in a flat which was losing pressure due to a leak somewhere- Turns out the leak isnt in flat but is between gas box and flat which means a horribly expensive job to find and repair it. The gas supplier should be able to come out and check its not a leak upto the gasbox for free and then your plumber should be able to check inside the house if there is a leak anywhere but defo turn it off for now.

can you check the overflow pipe, could be coming out there, ours loses pressure quite alot never seem to be any leaks so i assume it comes out there

overflow pipe is dripping, actually. Could that be it? It does generally lose pressure anyway, but I'm usually only having to top it up weekly, not this often.

i don't know but if the heating was still working with no obvious leak it would take alot for me to turn it off in this weather! obviously get plumber in asap though

I'm with you there South! I'm erring on the side of the dripping overflow valve being the culprit. Will be on the phone to plumbers first thing in the morning, though. Always has to happen when you can't easily get help, doesn't it?!

We had this problem. Turned out the top up tap wasn't properly switched off (I wasn't tightening it properly).

Mind you, when the engineer cme, he found another problem (safety valve corroded, water getting past it...) so I'm not sure which was the culprit.

Yes its the dripping overflow that is the problem. The pressure vessel in your boiler may well have gone.

This happened to us two weeks ago. Still has not been fixed properly.

This happenend to us once. Turned out one of the radiators was leaking - maybe you could check the floor beneath each radiator to see if it's wet and then turn off that radiator.

the plumber's been - he has repaired the pressure relief valve. I no longer have running water coming out of the overflow pipe. Phew!