Worcester 35CDI II pressure low then too high! Help

Hi
I have Worcester 35CDI II and over the last 6 months it sometimes looses pressure to 0.2 bar. I normally top it up and it seems to be okay.#

I'm not sure what the normal pressure should be and what it should be when on but I've set it to 1bar normal. When I turn the heating up the pressure has been increasing. If the thermostat temp is put up 1 to 2 degrees the boiler has to work for longer and the pressure has been going up to 3 bar. Is this too high? The other issue is when it is at 3 bar the boiler seem to leak. Well some drips of water come out of it. The upstairs radiators are not getting hot so I need to get it fixed. Any ideas on what I can do? pleae!Thanks

 

Sounds like the system is blocked so the water is not circulating .if the system is blocked which what it sounds like you will have to get it power flushed .if it was just the pressure problem I'd say it could be just the vessel blocked or the bladder buggerd but as some of your rads arnt getting hot it sounds like a sludge problem.

 

Hang fire on the blockaging fella, have you had anyone in to to check the expansion vessel at all?. you say the boiler is leaking but is it leaking directly from boiler or from the overflow(prv)? Having expansion issues can stop the system working correctly.

 

Hi Guys,

I was checking last night and some of the rads are warming up but not all. Some are stone cold. Downstairs seems to be fine.

I've not had anyone anyone in to to check the expansion vessel yet, I'ts going to be the next thing I do. Sorry I'm not too technical the leak was coming from the back part of the bilier. I spent ages trying to find it but was unable to pin point it. Where is the overflow(prv) is that the pipe going outside the house?

Thanks

 

My money would be on the expansion vessel.

 

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