Ariston A23/27 mffi combi boiler

[savage443]

Hey Guys,

I wonder if you can help.

My boiler keeps its running pressure when in the water boiling mode and when cool stands at 1.5 bar, which I was advised to maintain.

When being used in water and central heating modes the pressure always drops right down the scale to about a quarter of a bar. As a result I have to top up the pressure using the filling loop every day.

Has anyone any suggestions how I can sort this out.

Thanks for looking

sav

 

[Paul Barker]

Might be expansion vessel (EV) problems. Does it get very high, then come out of the overflow pipe (PRV), and then go down to 1/4 bar? EV needs charging, has a blocked pathway or is ruptured.

Whichever a quick fix is drain some water off but don't bleed one of the upstairs rads when you refill. That rad will act as expansion vessel but won't get hot, until you get EV seen to.

 

[ricarbo]

Sounds like there's a leak?

 

[savage443]

Might be expansion vessel (EV) problems. Does it get very high, then come out of the overflow pipe (PRV), and then go down to 1/4 bar? EV needs charging, has a blocked pathway or is ruptured.

Whichever a quick fix is drain some water off but don't bleed one of the upstairs rads when you refill. That rad will act as expansion vessel but won't get hot, until you get EV seen to.

================================================

Thanks for your reply, I read that an expansion vessal is a optional extra, as far as I can see we havn't got one. However, we are losing water thru the overflow tho how much I can't say because of the damp weather. If we don't have an expansion vessal (I do beleive this is an external exrta) is there any other advice you could give me?

Thanks again for your reply.

sav

 

[savage443]

Sounds like there's a leak?

Doesn't seem to be a leak, tho we are losing some water thru the overflow.

Cheers

sav

 

[ChrisR]

as far as I can see we havn't got one

Look harder! Big flat red thing at the back of the boiler!


That isn't an overflow, but a pressure relief pipe. Read "boiler pressure problems" in ref section.[/quote]