baxi duotec 28hea

[deandive]

Ive diagnosed a faulty three way valve on a baxi duotec, its also leaking from the dhw temp sensor. Ive had to buy two parts one with a bypass and one without as im a dingbat and didnt take pics, the parts guy didnt have a washer pack for the valve, so im wondering if the dhw sensor washer is something i will have on the van or can pick up easily. or do i need to order it...............I should really stick to installs

 

[Ermintrude]

Buy a bag of Vokera aluminium ones pennies from hot on heating spares. They will get delivered to anywhere next day.

 

[arran197]

The 3 way valve should be without bypass if the serial number is after cac10. If you know that? If it is the one with the bypass, you can just change the cartridge. It's much cheaper. Make sure you follow the instructions with it though or you'll regret it! Ha ha!

The ntc sensors always leak. They rattle loose in transit. Most of the time you can get away with tightening them, but if the sensor is corroded you might need a wiring loom too. They've changed the fibre washer to a copper one now, but some jet blue and a bit of ptfe does the trick normally.

 

[bigads28]

An aluminium washer or a drop of ptfe for the sensor is plenty.

 

[deandive]

I changed the valve today, I used a fibre washer for the sensor. All was going peachy untill I pulled off the connectors for the water pressure switch and the poxy thing snapped off the thread cue a 25 min drive to pick up a new one, then to top it off the boiler wouldn't work on heating, I get to the bottom of that( faulty wireless stat ) and before I know it its 1830 and I've missed my boys bedtime I know some of you like fault finding and breakdowns but it's not for me

 

[bewsh]

I've had a couple of those pressure sensors snap on me, absolute pain in the arse, specially if the boiler is at 1 bar when it snaps!!

 

[Billy Bob Bob]

get the brass one plastic ones are shyt LW 205 Baxi Low Water Pressure Switch 5114748 Compatible Ariston 995903

 

[deandive]

I was thining brass on brass would be better than plastic, may take up bricklaying instead ;-)

 

[solutions]

I've had a couple of those pressure sensors snap on me, absolute pain in the arse, specially if the boiler is at 1 bar when it snaps!!

Had one snap on a duotec this week. It was leaking from the thread not much, but enough to start corroding the case and warrant a cereal bowl below it. Whent to wind it out and It just sheared off. Then spent half hour tentatively drilling the broken portion out of the manifold and using a knife to split the remaining plastic and prize it out. Got a new one applied a turn or 2 of locktite 55 then a dab of rectorseal ptfe paste and finally it was ready to go thankfully with no more leaks. It clearly is a week point. Composite / plastic parts should not be threaded in to brass or vice versa. If they have to join those materials orings and locking clips are a better solution. Although those can present there own problems too.

 

[solutions]

get the brass one plastic ones are shyt LW 205 Baxi Low Water Pressure Switch 5114748 Compatible Ariston 995903

Nice one gas man. And thats half of what bum center want for the compo one.

 

[arran197]

I've snapped 2 out of all the ones I've done. And I have done quite a few! The plastic ones are ok, you just need to put some jet blue on the thread. Then just tighten it a bit more than hand tight.