Baxi HE Flue Problems Again

[arran197]

Ok, just to give everyone a heads up on this as I am coming across it a lot more now.

Baxi HE range of flue, so fitted to Duo Tec, Platinum and Megaflo HE and HEA boilers. The flue cracks down the exhaust plastic pipe where the flue duct seperator wire is. I've been to an address this evening and there's 4 flue extensions on the vertical flue and then the terminal section. All 4 sections are cracked. 2 of the sections have been cut down and they were fitted ok, not supported sufficiently, although I don't think that has any bearing on this issue.

Baxi have now finally altered the design of the flue seperators from being wire to a completely different plastic shape. The one this evening was giving a co reading of over 4000 ppm in the air intake and wouldn't stay lit for more than 30 seconds on high fire. When re fitting the new flue, you need to make sure the starting section has the flue outlet seal fitted to the top of the flue outlet.

Good luck.

 

[solutions]

Ok, just to give everyone a heads up on this as I am coming across it a lot more now.

Baxi HE range of flue, so fitted to Duo Tec, Platinum and Megaflo HE and HEA boilers. The flue cracks down the exhaust plastic pipe where the flue duct seperator wire is. I've been to an address this evening and there's 4 flue extensions on the vertical flue and then the terminal section. All 4 sections are cracked. 2 of the sections have been cut down and they were fitted ok, not supported sufficiently, although I don't think that has any bearing on this issue.

Baxi have now finally altered the design of the flue seperators from being wire to a completely different plastic shape. The one this evening was giving a co reading of over 4000 ppm in the air intake and wouldn't stay lit for more than 30 seconds on high fire. When re fitting the new flue, you need to make sure the starting section has the flue outlet seal fitted to the top of the flue outlet.

Good luck.

Not come across this before so thanks for the heads up. The new plastic spacers for the 60 / 100 flues are deffinately way better than the old metal ones. Would still like them to integrate some kind of clamp or screw to keep flue sections inserted in each other. and a means to keep the exhaust tube fixed to the outer air intake tube so they dont move independently. I hate when your dissmantling to remake and the exhaust section seperates from the next joint but 2 extensions further away than you need it too.

 

[dmheat]

Worked on these every day for nearly 2 years and came across that once. The flues you're referring to are the Multifit range.

 

[arran197]

Baxi Group HE Flue. Multifit, Interpart, Baxi, Potterton, Main, etc all Baxi Group.

 

[dmheat]

It's not called the Baxi HE range of flue is what I mean, the flue products you're referring to are the Multifit Group A flues. It's doesn't fit all Baxi HE boilers (or all potterton/main/avanta...)

 

[Billy Bob Bob]

are you finding this on the horizontals as well Arran or just the verticals,just for info the multifit used on the duotec HE/HEA also goes back as far as all baxi 105/80 HE potterton performa HE and main 30/24 HE

 

[arran197]

Not found any horizontal flues with this problem, although I think it's just the extensions that it happens on, so would need a very long flue for it to happen on a horizontal.

Yes, I was just giving some examples of boilers the flue is fitted to, I obviously failed to name every one. But I think people get the general ideal about the type of flue it is.

 

[dmheat]

I'm not trying to take away from the fact you've provided really useful information fella to help out fellow forum goers 🙂

The only time I had this at Heateam was one I found on a std horizontal flue kit fitted to a main he combi (band b). It hadnt cracked completely,but had a very defined crease along the plastic inner flue. The fga readings were exactly where they should be the only reason I found it was because I had the boiler off the wall changing the expansion vessel

 

[Ermintrude]

Had this on some 105he with vertical flue

 

[Pelsey]

Seen this a few times on suprima He's and once on a combi he