BAXI 105 HE PRESSURE KEEPS FALLING

[KEV KJ]

hi
i have a baxi 105 he, 16 months old. i keep finding that the pressure keeps falling, about once a day. the neon for pump/low pressure flashes and the boiler needs resetting. i fill the system to 2 bar, it heats upto 3 (overflows) then drops untill it reaches 0 and cuts out. from filling to refilling is about 24hrs.
i have checked the radiators, i cant find a leak, the times this is happening i would be swimming if it was a leak.

 

[Baxmax]

Instant ?

 

[KEV KJ]

yes

 

[baxpoti]

Try filling to 0.5bar max, it'll work fine.

Replace expansion vessel

 

[Baxmax]

When you say it overflows do you mean discharge through the pressure relief valve ? expansion wessel req part no 5117185,or is water discharging through the condensate pipe ? secondary heat exchanger req part no: 5112388.

 

[Baxmax]

Call heateam thems the guys that will sort it out

 

[baxpoti]

tryin' to get some overtime Baxmax?

 

[Vic Spanner]

part no 5117185

You have been told about that part number baxy boy.You naughty naughty boy

 

[KEV KJ]

installer came out today, said it was the blow off valve (pressure) would get a new one for £20 (£60 fitted) as its outside of warranty (12 month). hope this dose it .

 

[baxpoti]

When you say it overflows do you mean discharge through the pressure relief valve ? expansion wessel req part no 5117185

This is more likely to .... 'dose it'

The PRV is leaking due to pressure increases above 3 bar, unless your system is filthy and has contaminated the PRV.

 

[slamdunker]

Hi
Had this same problem about a year ago. Turns out that I have too many radiators/too large a system for the internal expansion vessel to cope with. Get a supplementary expansion vessel and tee this off the system somewhere conveniently discrete. Then replace the PRV as this is probably no good. Refill with inhibitor and then set the system up to 0.5-1.0 bar max when cold. Should sort you out
Dunk

 

[slamdunker]

Hi
Had this same problem about a year ago. Turns out that I have too many radiators/too large a system for the internal expansion vessel to cope with. Get a supplementary expansion vessel and tee this off the system somewhere conveniently discrete. Then replace the PRV as this is probably no good. Refill with inhibitor and then set the system up to 0.5-1.0 bar max when cold. Should sort you out
Dunk

 

[claire34]

can anyone tell me how to refill the baxi 105? Its pressure is at zero, i have three keys underneath but nothing happens if i turn any of them, the heatingis fine, the water is hot, but no pressure. Any help?