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Central Heating
LBMEFM - 6/1/09 at 07:44 PM

Any heating engineers who can help out there. My combination boiler keeps shutting down due to low bar pressure in the system. I have checked all pipe-work and rads for leaks, all seem fine where visible and I would imgine that there would be damp patches if it leaked elswhere. If I top-it up to 2 bar in the morning the following day it will drop to approx 0.5 bar. Any ideas what the problem is?

fesycresy - 6/1/09 at 07:58 PM

Check the pressure relief valve is not passing.

Should see drips coming from the pipe outside.

adam1985 - 6/1/09 at 08:40 PM

check the glands on rad vlave too can weep and follow the pipe

coozer - 6/1/09 at 08:52 PM

I had a similar problem and found it was a leak under the concrete kitchen floor. Didn't find until a mouldy patch appeared on the lino the n under neath was soaking.

Check round the whole house if you know where the pipes run for leaks. Under wooden floors into the void? (downstairs)

Are you having to bleed air off all the time as well? No idea what that means apart from calling the heating engineers

Steve

LBMEFM - 6/1/09 at 08:55 PM

Cheers guys, time for an engineer I think

DarrenW - 7/1/09 at 10:21 AM

quote:
Originally posted by coozer
I had a similar problem and found it was a leak under the concrete kitchen floor. Didn't find until a mouldy patch appeared on the lino the n under neath was soaking.

Check round the whole house if you know where the pipes run for leaks. Under wooden floors into the void? (downstairs)
Steve



Exact same happened to me. Just finished renovating the house. New laminate floor in kitchen etc. Leak was under the kitchen floor and fridge was on top of it. Only noticed it after a while when fridge was moved and floor felt damp. Problem was old joint in pipework leaking.
Happened to me after changing standard boiler and tanks for the combi. Was told it was common due to combi's running on full mains water pressure rather than gravity feed - meaning if a joint is prone toa leak then the higher pressure will cause it to fail. Im afraid its not easy to find sometimes, if no obvious leaks in ceilings etc (id expect those to show up quickly if leak is in first floor voids) keep a close eye open for anomolies in the downstairs floors. And keep checking those rad valves for leaks.

Works boiler kept losing pressure due to the valve mentioned above.

[Edited on 7/1/09 by DarrenW]