baxi instant 105 he

[desrob]

i changed the exspansion vessel and when i put it back together it leaked from the pump the plate ex and the secondry heat ex,whats the best way for these connection on the secondry heat ex the boiler plan shows o rings but mine had none ,i tried some and it made no differrance,the pressure gauge is faulty giving incorrect pressures

 

[Billy Bob Bob]

re-fit new o rings with silicone grease the pump should just tighten up on the plastic base the high pressure is the reason its leaking change the pressure gauge

 

[Leo21]

Easy way is to take the o ring off and wrap ptfe round once in the groove re fit o ring. This packs out the ring, works every time for me. Also there are two pump o rings like a barrel nipple. It pulls out of the pump and easily missed. Took me hours to find this, kept on re fitting the pump with ring and it kept on leaking.

 

[Billy Bob Bob]

Easy way is to take the o ring off and wrap ptfe round once in the groove re fit o ring. This packs out the ring, works every time for me. Also there are two pump o rings like a barrel nipple. It pulls out of the pump and easily missed. Took me hours to find this, kept on re fitting the pump with ring and it kept on leaking.

you wont need ptfe on this boiler,just silicone grease a ferroli however that a different matter

 

[Leo21]

Using ptfe means you don't have to replace o ring. If you haven't got any new ones. Life saver when time is tight.

 

[desrob]

re-fit new o rings with silicone grease the pump should just tighten up on the plastic base the high pressure is the reason its leaking change the pressure gauge

thanks, i had no grease but will go armed tomorrow,i nipped pump up as much as i can,but still weeping,i was going to take out and replace rings etc

 

[desrob]

Using ptfe means you don't have to replace o ring. If you haven't got any new ones. Life saver when time is tight.

i used ptfe ,it held when cold but as soon as it got hot it started again,..

 

[Billy Bob Bob]

thanks, i had no grease but will go armed tomorrow,i nipped pump up as much as i can,but still weeping,i was going to take out and replace rings etc

ok replace the rings but use grease and sort the gauge this boiler must be set to 1 bar when cold or you risk blowing the recouperator

 

[Billy Bob Bob]

Using ptfe means you don't have to replace o ring. If you haven't got any new ones. Life saver when time is tight.

i can see where your coming from leo but ptfe will fail on a instant its under a lot more strain than a normal 105

 

[desrob]

ok replace the rings but use grease and sort the gauge this boiler must be set to 1 bar when cold or you risk blowing the recouperator

is an erratic condensate trap a sign its failed

 

[Billy Bob Bob]

is an erratic condensate trap a sign its failed

yes,if water is pouring into it,its failed

 

[Leo21]

Every days a school day. Just out of interest why is it under more strain? Sounds like its time for a new boiler.

 

[Billy Bob Bob]

Every days a school day. Just out of interest why is it under more strain? Sounds like its time for a new boiler.

its a instant so it has a small thermal store built into the EV for some reason it radiates high amounts of heat through the boiler and puts the whole thing under high water pressure this version is very prone to o rings failing,recouperaters blowing and dhw valves failing when baxi took the reliable 105 and butchered it to make the instant they really did not think this through,also if a o ring on the main hex leaks it often runs down the loom and kills the pcb DESROB​ your looking at a few o rings budget 20 quid for these they are quite dear if the recoups failed just get the front cover assembly its about 67+vat,plus a new pressure gauge about 9 quid

 

[dancinplumba]

is an erratic condensate trap a sign its failed

frgive ignorance, but what is an 'erratic' condensate trap

 

[Leo21]

Loved the old 80e and 105e, so easy to repair. The instants are bag of nails at best.I was tld by baxi tech that main heat x rings aren't available and that you have to buy whole new exchanger.

 

[Billy Bob Bob]

Loved the old 80e and 105e, so easy to repair. The instants are bag of nails at best.

yep,ever done a EV on a instant he in situ?not easy

 

[Leo21]

No always put an external on. not worth fitting original, life span to short.

 

[Billy Bob Bob]

No always put an external on. not worth fitting original, life span to short.

it is but sometimes custards with no cuboreds etc to hide it in want the original back glad i have no instants on service contr..... hang on just remembered i still have one somewhere,:81: yep crushing it should work

 

[Leo21]

Guess ive been lucky so far. Don't think I've ever come across a completely dry one.

 

[dancinplumba]

didnt know these had recuperators, tho you can get them as an extra, like the gassaver which fit on the flue

 

[Billy Bob Bob]

didnt know these had recuperators, tho you can get them as an extra, like the gassaver which fit on the flue

its sometimes called a recuperater its also called a secondary exchanger,HE exchanger,or the easier to understand version the round thing on the right hand sides shot love

 

[dancinplumba]

its sometimes called a recuperater its also called a secondary exchanger,HE exchanger,or the easier to understand version the round thing on the right hand sides shot love

is that what thay put in band b boilers love ? understand now thanks

 

[dancinplumba]

frgive ignorance, but what is an 'erratic' condensate trap

could you please explain what one of these is gasman, neva heard of one

 

[desrob]

could you please explain what one of these is gasman, neva heard of one

ha ha my god...it's a condensate trap ........miss behaving.... because the failed secondry ex chucking water into it rather than a steady trickle..

 

[dancinplumba]

ha ha my god...it's a condensate trap ........miss behaving.... because the failed secondry ex chucking water into it rather than a steady trickle..

why ? seems a sensible question