Baxi 105 HE Instant

[sie1uk]

Had the above boiler fitted a year ago, and have recently had to keep toping up the pressure, then when iv checked it today its down to .5 bar re pressured it up again to 1.3 without the pump going. I have checked all the rads and everyting is dry no loss anywhwere. Only thing i can think off is during the night when the pre heat comes on i can hear a sort of kettling sound through the rads. Any ideas ?
Cheers
simon

 

[gas4you]

hope baxpoti comes on line 2nite. Sorry

 

[ChrisR]

If the rads warm up at all when the preheat comes on, yer diverter valve's "letting by".

Check the presure relief pipe which goes through the wall for drips
Check the automatic air valve for dribbles

How much does the pressure rise when the CH warms up from cold?

Pressure vessels are prone to failure on these.

Mañuel at partsarena.com/baxi.

 

[sie1uk]

rads dont heat up at all, no drips from relief pipe, not sure where the auto air valve is, pressures rises around 1 bar. can you let me know where the airvalve is, the filling loop has been on since theye installed the boiler will this make any diffrence ?

 

[Agile]

The pressure should only increase about 0.3 Bar from cold to hot.

Repressurise the expansion vessel as in FAQ but in this case let ALL the air out first to see if water comes out as they have a high likelyhood of having failed!

Tony

 

[baxpoti]

The pressure should only increase about 0.3 Bar from cold to hot.

With 2 small rads, maybe.



Put a bag/balloon over the end of the PRV pipe and see if it any water is discharged

 

[sie1uk]

No water coming from PRV, any more ideas, if it is the vessel how much roughly to replace ? cheers

 

[baxpoti]

If you keep putting water in, it must be coming out somewhere!

Charge the system to 0.5bar cold and see if there's any loss o/night

 

[sie1uk]

ok will try that now i will pressure to 0.5 now and check again tomo, cheers