Wild swings in water pressure - Ariston Combi

[dandy]

I have an Ariston EuroCombi (SX 20 MFFICE) installed, and I am experiencing significant fluctuations in water pressure. I.e. swings of +3bar to 1 bar over several hours, sometimes resulting in water being dumped through the pressure release valve.

As an interim, I have re-pressurised the system each time. The radiators have been bled and have checked for possible leaks in the central heating system, but found none.

Any suggestions?

 

[IanDB]

You have the same problem that I have - see "High Boiler Pressure" in the Plumbing section. The advice I was given was that it may be to do with the expansion vessel - either needs re-pressurising or is faulty in some way.

 

[dandy]

Thanks Ian,

It sounds quite plausible. I shall have to dig out the manual to see how I can re-charge the vessel, if at all. Presumably if I have a leaky valve in the pressure vessel, then it should be leaking water (out of the valve) as well?

Andy

 

[Registered Gas Man]

Pressure vessel is knackered, depending on how long its been like this determines if you will get away with just pressurizing it!!!

 

[dandy]

Thanks for the sound advice Ian & GasMan. I’ve re-pressurised the expansion vessel, and put the boiler through a number of hot ‘n cold cycles – so far, so good!

 

[Registered Gas Man]

Good job, your in the wrong industry.