Boiler making a hissing noise and pressure going up rapidly.

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patryk991

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Hi,

I have an issue with my boiler which consists of it making a hissing noise and pressure meter going up when the central heating is on.

I haven't tested what happens when the pressure is extremely high as I turn it off before it goes above 3 bars.

The central heating is not working but hot water is. Thing about hot water is that when I turned the tap on today I had rusty water come out and then steam for some time, this has stopped now and hot water seems to work properly.

Additionally, the last couple of time I had central heating on I could hear loud banging of the pipes a couple of times, not often.
 
sounds like your expansion vessel needs re-pressurizing lots of explanations of how to do it in the FAQ section
 
If in fact it is a problem with the expansion vessel then would it be safe to use hot water at least?
 
Last edited:
yes the swift flow is a combi, but a very old one, I wouldnt be spending a lot of money on that to be honest
 
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