Why does the pressure drop on my Combi boiler hot water and central heating system ?
Over a period of a few days – the pressure in the system drops to 0 so that the boiler will not fire up. Ther is a small leak from one of the valves on a radiator, but it has been dripping for a while and it is only recently that I have had to top it up so often. Any suggestions ?
There are four possible causes for the pressure drop in your system -
1/ A leak, it is unlikely that the drip on your radiator would cause such a dramatic pressure drop
2/ The pressure relief valve letting-by – there will be an open ended pipe that goes from your boiler through the wall to outside, check that this isn’t dripping/running
3/ The expansion vessel losing it’s pressure – the system would have to be drained down and the pressure in the expansion vessel checked
4/ Air in the system venting through the automatic air vent in the boiler
It will be one of these problems, only investigation will determine which one.
Hope this helps
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