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Some time ago, I asked this question. The problem I had was that the pressure in my central heating system was dropping, and I couldn't find the leak in the system. I'm now convinced that I don't have a leak.

I've heard that cold weather can cause heating pressure to drop, and this relates to the overflow pipe from the heating system. So my follow up questions are:

  • Is this true? Can something outside the house freezing cause the pressure inside to drop (and if so, why)?
  • How can this be fixed?
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I really hate to say this, but your suspected problem is probably way beyond the capabilities of a DIYer. If you are still having problems, it may be time to call in a pro. I have not seen any good answers to this kind of question here on the Stack. I don't think we really have a HVAC expert here. Bite the bullet, find a really competent tech with the right diagnostic tools to find and fix your problem. What you are losing in comfort, fuel effiency , and potential fuel costs might be more than the bill from a proper repair. You may have an equipment malfunction and only putting off the inevitable.

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To be honest, I didn't really intend to attempt this myself (it's actually illegal in the UK anyway). I just find it a lot cheaper when I heating engineer (or anyone) comes around if I can point them in the right direction and be able to recognise some of what they are talking about. – pm_2 Feb 17 '11 at 16:42
up vote 2 down vote accepted

I found a very useful answer here which put me on the right track. The phrase that the heating engineer we got used was "Pressure Valve" but it sounds like exactly the same this - he suggested as well that it'd be quicker and cheaper to fit an external one.

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