Worcester 24CDi RSF Pressure Problems

marky79 · 20 Jun 2006

Hi

I have a 24 CDi RSF boiler. It is providing CH & HW fine but the pressure seems to rise of its own accord until it gets to about 3.5/4. This causes a lot water to continuosly pour out of the overflow pipe.

I've made sure that the bayonet key isn't inserted and the fill tap is definitely in the off position

chrishutt · 20 Jun 2006

I think this might be the boiler that has a history of leaks across the secondary heat exchanger (mains pressure to system). You can test it by closing off the isolating valve on the cold mains connection to the boiler. If the pressure rise then stops it confirms the leak. You'll need to have the secondary heat exchanger replaced.

ChrisR · 20 Jun 2006

by closing off the isolating valve on the cold mains connection to the boiler.

Having just spent half a day changing one of those on a cdi which leaked as soon as it was touched (I'm told) I'd be looking for the main stop-cock!

ollski · 20 Jun 2006

It will be the dhw hx as chris said, one of the very few jobs on this boiler which is simple.

marky79 · 20 Jun 2006

Thanks for your help. When you say it relatively simple, does that mean that with limited knowledge of boilers it can still be done?

ChrisR · 20 Jun 2006

Last one I took off, there was a plastic part which I knew should pull out but it didn't want to come.
a) you wouldn't know it was supposed to just pull out so you'd be scratching your head and
b) you wouldn't know what to lever against where to avoid breaking it.
Those are the sorts of things which could go wrong for anyone , first time, and a bit more likely if you haven't done similar things on other boilers before, or have the right sort of tools.
There's also a pipe which bends really easily then leaks, O rings and special grease you'll need, etc.

Gasguru · 20 Jun 2006

Yeah, years ago I checked with Chaff. technical on adjusting the slow ignition device on an old Brittony (the manual was unclear).

The idiot told me to unscrew a knurled cap - just about unscrewed it and it blew across the room - mains water pouring out and no access to the stopcock/isolating valve.

Having found it I then shredded my thumb getting it back on.

Lesson learnt - never trust technical helplines been told more bull s**t by them than anyone else. Worst was a very incompetent lady at Biasi technical trying to convince me the burner pressures didn't matter if was a Nat gas or LPG model on an old Savio Acq.

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Worcester 24CDi RSF Pressure Problems

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