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Hello,
A couple of weeks ago I got suspicious that a small amount of water
may have leaked from the bottom of the boiler onto the surface below.
I put a "collector" thre to get an idea of the amount. I checked it a
few days ago and there just seemed to be a small patch ((worrying in
itself).

Today, I had trouble with the how water demand - turning a tap fully
on would activate the hot water from the boiler, but lower flows, eg
my morning shower, would not get it to heat up.

Since then, I have noticed that larger amounts of clear water have
leaked from the boiler into the tray, eg perhaps enough to fill a mug
by 1 cm every half hour.

Does anyone have any experience of this or ideas on what might be
wrong?

Also, I have tried contacting Bosch as I seem to recall they used to
offer servicing and repairs directly, but I am having trouble finding
contact details.

Do Bosch still offer direct repairs and servicing, or are there any
other reliable specialist firms who I could contact, rather than
plucking an outfit at random from the yellow pages? My location is
West London.

Thanks,
Richard Hamer


How strange! My Worcester 28Cdi RSF had similar problems a few weeks
back too...

I had excessive changes in pressure, lack of hot water and water
appearing from the pressure relief valve.

Check Ed Siretts FAQ - it will answer everything!

Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html

What's the system pressure doing? If it's peaking at 3 bar then the
relief valve is opening - hence the water leaking? If so your pressure
vessel may be ruptured. Check the air valve on it. If water comes out,
you'll need a new vessel. The easy way to replace it is to take the
boiler off the wall, drill out the rivets that hold the mounting plate
and drop it out of the back.

Lack of hot ware could be the diverter valve. Take the flow switches
off, by removing the C clip and take a look at the plunger pin. It
should come out when the hot tap goes on. If not, you need a new valve.

We used an Ariston (i think) diaphragm instead of buying a whole new
valve.

The install manual is available on the net, it has a fault finding chart
which may help.

God, I didn't even know what a combi boiler was last month.....!

TTFN

--
Richard Markham