Releasing pressure on Ariston 23MFFI combi boiler

[gruber]

Hi,

I have the above boiler in my home and the pressure is currently sitting at around 2.5 bar. I realise i need to reduce this and have tried bleeding rads etc but this has made hardly any difference.

Does anyone know if and where there is a pressure release valve as scanning over brochures etc i can't seem to find one?

Cheers

 

[boreas]

Under the boiler, right side, you'll find a black cap, very similar to a ballpen cap. that is the magnetic activator of the automatic refill. Remove it, then you can release some of the pressure by bleeding on one of the rads. If the pressure decreases in the coming days, or anytime when top up needed just pu the cap back for a minute, check gauge etc. etc.
Anyhow 2.5 bar is not critical, you have also PRV.

 

[gruber]

Thanks Boreas, but i can't locate the ballpen cap you refer to. Is this behind the bar gauge above the circulation pump?

 

[boreas]

Not inside, outside underneath on the right side

 

[gruber]

Defo not there. Any idea where the PRV might be?

 

[boreas]

Awfully sorry, given wrong advice, yours is a 23MFFI, not an 32MFFI
You can release overpressure slowly turning PRV clockwise. You can find it behind the pump, a bit higher.Has a red or black cap on it.

 

[so-solar]

bang a hose on a drain off and drop the pressure this way, i am not a fan of using pressure relief valves as i have done this in the past and have had them not re seat and let by,

 

[gruber]

thanks a lot, have located it, just need to try and budge it now!!!

 

[JimH]

thanks a lot, have located it, just need to try and budge it now!!!

Shouldn't need much effort - try anti-clockwise... LOL!

 

[Billy Bob Bob]

do not use the prv on your microgenus to release pressure,you will ruin it as said use a hose pipe on a drain off dissipate the pressure that way