Greenstar Highflow 440. Loss of pressure

[Diyisfun]

Above combi boiler, loss of pressure last few days, I refill & next day no pressure again.
I called a local plumber today he told me to see if the PRV was letting water escape. He said turn boiler off so all gets cold, set pressure to 1bar & switch on, he said if pressure goes up to +3bar, then the expansion vessel may have gone.
Looked at a few youtube clips & I now note the following:
if I press the Schrader valve water comes out.
I have expelled the water best I can & pumped up the vessel (0.75bar).
I have now restarting the boiler, (it was running ok, just need to keep topping up).
What I want to know is have I fixed it? or do I need a new part?
Murphys law, I am away all next week & I cant have the lady of the house without hot water & heating.

 

[terryplumb]

When you pumped up the EV ,did you relieve system pressure prior ? If water was coming out of the EV valve ,its likely it may have to be replaced. You will know tomorrow if your attempts have been successful , if you leave boiler / ch on today and monitor pressure gauge.

 

[Diyisfun]

When you pumped up the EV ,did you relieve system pressure prior ? If water was coming out of the EV valve ,its likely it may have to be replaced. You will know tomorrow if your attempts have been successful , if you leave boiler / ch on today and monitor pressure gauge.

I did relieve the pressure. Its been running now for about an hour, pressure has gone from 1bar to 1.75bar, so that is certainly better.

 

[terryplumb]

Time will tell. If it has not sorted it ,you can use a radiator as a temporary EV whilst you are away.and sort it proper upon your return.

 

[rochdalegas]

If you had water at the shraeder valve i would expect the expansion vessel would need changing sooner rather than later.

 

[Diyisfun]

If you had water at the shraeder valve i would expect the expansion vessel would need changing sooner rather than later.

Just been looking at prices, best I found £90.58 +£7.50postage. Looks like an easy job to replace. IS IT?

 

[rochdalegas]

Very straightforward in these.one nut and one screw if i remember correctly.