Hi I've got a leak from the safety valve on my ariston combi and the safety valve has just been replaced but the leak continues. The pressure in the system is 1 bar at cold, but goes up to 2.5 or there abouts when in heating mode. This is when it starts dripping from the safety valve. Any ideas on a solution from anybody.
Ariston 20/1 MFS Leak from safety valve.
- Thread starter jif06
- Start date
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Drain boiler and leave drain point open to atmosphere.
use car tyre pressure tester to measure pressure in expansion vessel.
If too low (say under 0.8bar ) then use bicycle pump to bring the vessel up to that level.
use car tyre pressure tester to measure pressure in expansion vessel.
If too low (say under 0.8bar ) then use bicycle pump to bring the vessel up to that level.
I tried that the other day and it seemed ok for a while then it just kept loosing pressure even when the heating wasnt on. After 2 or 3 days it keeps pressure if only used for hot water, but as soon as the heating is turned on it looses pressure from the prv again. Should I just try to do the recharge again? I did go a little under on the pressure of the recharge to be on the safe side.
Is the vessel losing pressure as well as the CH?
Haven't checked that yet, I just ran a full bath earlier and it has kept pressure in the system, I just put the heating on but the pressure in the system will go up to 2 or 3 bar and will seep from the prv. I will try to repressurise the expansion vessel tommorrow and see how it goes. ( If it is loosing pressure from the expansion vessel does that mean it needs replacing?)
Thanks
Thanks
Yep, which will probably mean taking the boiler off the wall - and having just read the manual I wouldn't bother putting it back.
Just fit an external one somewhere until it is new boiler time.
Just fit an external one somewhere until it is new boiler time.
Just checked the pressure vessel at the valve and it is loosing a drop of water so it looks like the vessel needs replacing. A previous post says the boiler has to come off the wall but my book for it says that you only have to remove the box containg the flue switch and the vessel is removed from above. Any comments?
Before you do anything else let ALL the air out of the EXV and see if any/much water comes out!
They will still sometimes work for a while even if they are leaking a bit.
However when you pressurise the air with the system open then if they are leaking a lot you will not be able to get the pressure up to the 0.9 Bar. Then repressurise the water immediately to 1.5 Bar cold.
Tony
They will still sometimes work for a while even if they are leaking a bit.
However when you pressurise the air with the system open then if they are leaking a lot you will not be able to get the pressure up to the 0.9 Bar. Then repressurise the water immediately to 1.5 Bar cold.
Tony
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