Water pressure problem

[PaulG]

The water pressure in my central heating system frequently drops. After re-pressurising it, it returns to normal, but then the next time the heating is switched off, the pressure drops again. Any ideas?

I have a combination of old "cast iron" radiators as well as more modern ones. Could this be the source of the problem? It's been working fine for the last 4 years. Also, I've checked all the radiators and there doesn't appear to be any leaks.

 

[oilman]

Check your expansion vessel if you haven't already.

 

[sharpshooter]

I have exactly the same problem, and I have all new readiators and boiler.
Question: How do you check your expansion chamber????
Help!!!!

 

[oilman]

How do you check your expansion chamber?

Search the forum for expansion vessel and filling loop. There's loads of posts sept to nov 2003.