Question about Automatic Air Vent on Baxi HE133 Plus

FooManChu · 18 Nov 2007

Hi

I've recently carried out a repair on a Baxi HE133Plus boiler(combi) which involved a drain down. I followed the instructions to open all vents etc for drain down but I am not sure at what level of opening the Automatic Air Vent should be at? The boiler filled ok with no problems and I have good pressure although it fluctuates from time to time even with a radiator bleed (no air at all present in the rads)

The boiler has been working fine since the repair (over a month ago now) but I have been wondering about the air vent. The vent iteselt has a small plastic cap on it. Should this be screwed tighly closed or loose? If I loosen it, a small drip appears from the valve but then stops.

Can anyon advise please?

Anth

ChrisR · 18 Nov 2007

Open it a turn or two. If it leaks much replace it.
If your pressure varies by more than about 0.5 bar see faq - pressure p's.

FooManChu · 18 Nov 2007

Thanks for your help.

I've now adjusted this and will monitor the pressure.

Anth

Pancus · 6 Nov 2012

ChrisR said:
Open it a turn or two. If it leaks much replace it.
If your pressure varies by more than about 0.5 bar see faq - pressure p's.

I need to replace my auto air valve cap on my Baxi 133 HE plus. The black plastic cap.

Can I get this on it's own for a few pence and if so where from. I am currently being told that I have to buy the whole auto air vent unit for £16. Thanks

45yearsagasman · 6 Nov 2012

It may well be the same as a dust cap from your car. Give it a try.
The cap is meant to be loose. If yours is leaking then replace the valve.

Pancus · 6 Nov 2012

Thanks. The existing one is like a dust cap but it has a small hole formed on the side near the top. I'll try my car one.

It is leaking but would have thought that if a replacement one was left loose then it would keep leaking??

Terry7556 · 6 Nov 2012

yes because the valve under the cap is leaking. a new valve comes with a new cap

CBF · 6 Nov 2012

Pancus said:
Thanks. The existing one is like a dust cap but it has a small hole formed on the side near the top. I'll try my car one.

It is leaking but would have thought that if a replacement one was left loose then it would keep leaking??

it's an auto air vent if you screw the cap down it can't auto air vent, so really then it's pointless having it there

Pancus · 6 Nov 2012

Got it now. Thanks.

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Question about Automatic Air Vent on Baxi HE133 Plus

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