vaillant eco max 828/2e losing pressure

[kevvvin]

HI Guys

Got this boiler vaillant eco max 828/2e it as been fitted 5 years now when the heating as been on the needle on the pressure gauge goes off the scale

and at some point we seem to lose the pressure in the system, i have not seen any water come out of the 15mm expansion pipe as yet as we seem to lose it early in the morning or over night

i assumed the pressure vessel needed pumping up so i got me bycicle pump out and tried to connect it to the pressure vessel nipple but water came out of the nipple and drowned me lol

as i assume only air should fill the top half of the diaphragm in the vessel am i right in saying that the diaphragm is split and we need a new vessel?

thx for help guys

 

[Agile]

Yes

Tony

 

[kevvvin]

Cheers for reply

 

[The831Bunny]

Not necessarily!

Turn off the heating isolation valves on the boiler. Drain via drain offs on valves. Pump up expansion vessel to 0.7 - 1.0 Bar. Refill boiler to 1.5 Bar. Open isolation valves. Test Dhw and Heating.

THEN try Schrader valve on expansion vessel. A small amount of water is permissible, it usually creeps round the welt of the diaphragm when the vessel is completely flat. I would be very surprised if you had to change the vessel. Not impossible, but very rare!

View media item 28141

 

[kevvvin]

Not necessarily!

Turn off the heating isolation valves on the boiler. Drain via drain offs on valves. Pump up expansion vessel to 0.7 - 1.0 Bar. Refill boiler to 1.5 Bar. Open isolation valves. Test Dhw and Heating.

THEN try Schrader valve on expansion vessel. A small amount of water is permissible, it usually creeps round the welt of the diaphragm when the vessel is completely flat. I would be very surprised if you had to change the vessel. Not impossible, but very rare!

View media item 28141

the Schrader valve is on the side and half way up of the pressure vessel on this boiler i assume thats the right place to try to pump it up


1.0 BAR is that about 15 spi on the foot pump i think



cheers for the info The831Bunny

 

[The831Bunny]

Yep, you got it