Vaillant VCW 242E Reluctant hot water
In message , Thomas Prufer
writes
On Wed, 2 Dec 2009 21:23:51 +0000, geoff wrote:
My questions a
1. Are we right in suspecting the diaphragm is at fault here?
Almost certainly the diverter valve and yes, probably the diaphragm
Is there a small chance that lubricating it would help?
I have a 240, and the diverter valve pin that actuates the microswitch started
to stick. A drop of light lubricant (no, not WD-40!) sorted it, now
going on for
a few years.
Usually, the diaphragm kit includes the pin, which does wear with use
If you must lubricate - silicone grease
Personally, armed with the exact model and serial number (e.g. is it a
242E or 242EH?) I would email them and ask them which one (I would buy
the diaphragm kit as should include the seals etc. It's not something
you want to repeat next year because a seal has gone or something), then
the responsibility lies with them to get it right
3. Will we need the service manual in order to fix the problem or
should it be pretty obvious disassembly-wise to remove and replace?
No - the manual only goes as far as replacement of the diverter valve
IIRC
SO ...
You want to repair your diverter valve
Make drawings and photos at every stage. I can't emphasise how important
this is - there are so many things that could go one way or an other
Do it in one sitting then you have less time to forget
its much easier once you've done a few
Other than that, it's straightforward
Isolate the boiler, drain down, remove the diverter valve, mend and
replace
And you may need some stuff to descale the innards, depending on your
water. And
gaskets for the stuff nearby. They will start to leak if disturbed when the
shops are closed...
--
geoff
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