Worcester Bosch Pressure Problems

Aquaman · 31 Jul 2012

Can anybody help me with a Worcester-Bosch junior 28i condensing boiler which I have been having problems with for 6 months...as I’m pulling my hair out!!!
The pressure in the system after being on for 20 minutes rises from 1.0bar to 3.5bar and then the water pressure fires the prv. When you turn off the heating demand the pressure drops to 0.5bar or less, so you top it up and the whole scenario plays out again. This eventually broke the last prv (because of dirt on the seat and it wouldn’t reclose)
Here’s what has been done so far:

1.The pressure vessel has been checked by an engineer. It is not broken and has the correct pressure every time it’s been checked.

2.As I say the pressure release valve has been replaced last week after the previous one eventually broke due to releasing water

3.There are NO leaks anywhere in the system

4.The system has been checked and serviced regularly and two engineers’ from different companies seem at a loss to the problem

Has anybody here got any idea’s???

ANY help would be most appreciated!

misterdubya · 31 Jul 2012

The communication tube to the vessel is probably blocked - or has that been checked too?

McCombi · 31 Jul 2012

Sounds like expansio n vessel problem but you say that's been checked... Maybe some kind of restriction in boiler. How big is the house, is the exp vessel large enough to cope? If not adding an external vessel on the system may help.

Aquaman · 31 Jul 2012

misterdubya said:
The communication tube to the vessel is probably blocked - or has that been checked too?

One enginner thought it maybe this....but he says they shouldn't get blocked so I don't think he checked it.

misterdubya · 31 Jul 2012

Aquaman said:
misterdubya said:

The communication tube to the vessel is probably blocked - or has that been checked too?

Click to expand...

One enginner thought it maybe this....but he says they shouldn't get blocked so I don't think he checked it.

Well, they do block - I can assure you of that.

45yearsagasman · 31 Jul 2012

The connection tube is the flexible type and can easily be checked for blockages. I suggest this is done before going any further. If your man is not sure how to do it then employ someone who can.

doitall · 31 Jul 2012

Has addition rads or work been done prior to the problem.

Aquaman · 31 Jul 2012

45yearsagasman said:
The connection tube is the flexible type and can easily be checked for blockages. I suggest this is done before going any further. If your man is not sure how to do it then employ someone who can.

Is this something I can do?

45yearsagasman · 31 Jul 2012

The case on these is sealed and hides the fan assy and heat exch and as such should only be removed / replaced by someone gassafe registered.
The work itself is simple and should take no more than 30 mins to complete.

misterdubya · 31 Jul 2012

45yearsagasman said:
The case on these is sealed and hides the fan assy and heat exch and as such should only be removed / replaced by someone gassafe registered.
The work itself is simple and should take no more than 30 mins to complete.

As above, and there will be a lot of pressure from the vessel when the tube is cleared as it will partially be filled with water. It is a simple job though.

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Worcester Bosch Pressure Problems

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