Baxi Condensing Boiler Query.

[Evans Electric]

When the mains pressure drops we get the error code on the control panel.    I recharge the boiler until the pressure gauge reads  2.5 bar which is the limit of the green (safe)  scale .   After a month it usually drops below 1 bar and the error code flashes.

But I notice that when the boiler is actually working the pressure rises to 3 bar  which is in the red scale  .

Is  this OK   ?   

 

[Andy™]

it should only be filled to 1.2 bar. if it goes up to over 3 in use then you need a new expansion chamber

low pressure warning is usually around 0.5 bar

 

[Steve3948]

Sounds like there is a slow leak somewhere  :innocent

 

[Evans Electric]

Think you're right about the leak .

Andy ...so I've overcharged it ....best bleed a rad then !

Thanks guys.

 

[Andy™]

is there any water coming from the blow off?

 

[ProDave]

Large pressure change from cold to hot is a sure sign the bladder in the expansion vessel has ruptured and it's full of water, so little or no air in the bladder to allow for expansion of the water.

 

[Sharpend]

Charge it to 1-1.5, if you find you are continually having to charge it, then it could need a new expansion chamber as the diaphragm has probably got a hole in.

 

[Richard-the-Ninth]

According to other plumbing forums, (I am not a plumber) if the Pressure relief valve has ever activated it should be replaced as they do not re seal very well. in effect making a slow leak.

Could also check the air pressure of the expansion vessel.

just saying.

 

[Adrian]

If the diaphragm has gone you will need to remove the boiler from the wall to replace it . it would be easier to fit another one somewhere else on the system they are really easy to fit 

 

[SLIPSHOD & SLAPDASH]

According to other plumbing forums, (I am not a plumber) if the Pressure relief valve has ever activated it should be replaced as they do not re seal very well. in effect making a slow leak.

Could also check the air pressure of the expansion vessel.

just saying.

Quite right about them rarely sealing correctly at  first, but i have  always managed it after a  couple of goes 

 

[Evans Electric]

is there any water coming from the blow off?

Dunno where the blow off is Andy .  

I bled a radiator , all water BTW , and lowered the pressure to 2bar .       Thanks for your tips,  I'll monitor it now  , see how long before it goes to error again .   Boiler almost new so could get them back to take a look. 

 

[Andy™]

Dunno where the blow off is Andy .  

I bled a radiator , all water BTW , and lowered the pressure to 2bar .       Thanks for your tips,  I'll monitor it now  , see how long before it goes to error again .   Boiler almost new so could get them back to take a look. 

its insde the boiler with a pipe going outside