Potterton 28 HE Plus Combi Boiler Leak at 3 way valve and

[sundaybighouse]

Hi guys, I wonder if you could help me:

The potterton 28 HE plus is around 10 years old. On two occasions in the last 2 months the chs and hot water stopped working. On the first I occasion the pressure had dropped to 0.5 bar and I just topped up the system and it started working.

On the second occasion I was keeping an eye on the pressure which was going very close to 3 bar(the cut off point)and then it stopped working and the pressure dropped down to 0.5.

Having read the faq on diynot I decided to try to measure the expansion vessel pressure but I could not get my hand in to access the valve. The valve is on the top but I could not see a way to remove the top panel to access it and could not access it from head on.

Whilst doing this I had a look around and noticed white powder discharge coming from a bolt on what i think is the three way valve and other discharge on the drain off bolt.

So basically are these leaking?

What should be my next step?

I have attached pictures which hopefully make it clearer.

Thank you in advance.

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[pallen5000]

It looks like you're getting too involved. Although this is not classed as "gas work" the area that the expansion vessel is in is a sealed unit that effects the combustion.

 

[sundaybighouse]

No, not qualified.

I just took off the front panel to measure the pressure in the expansion vessel which I had done a few times on a different boiler.

 

[sundaybighouse]

The guide is in the faqs.

 

[CombustionGuy]

You need a angled pressure gauge and need to remove the bracket holding the green spark generator then you can get you hand in.

 

[sundaybighouse]

Yeah I removed the spark generator but still couldn't get my hand in. I was using a standard gauge though not an angled one.

Thanks anyway