In message , Ed Sirett
writes
On Wed, 17 Oct 2007 08:39:45 +0100, bof wrote:

In message ews.net,
Doctor Drivel writes

Check the pressure vessel charge. This goes flat quickly on these
models. Check the system pressure. It has a low pressure switch, so if
pressure low problems.

If the pressure's stable and, from prior experience, if the pressure
does drop it won't light the DHW either.


I'm not sure if it also has a CH flow switch, if so check this.

Thanks, the CH light flashes continuously, irrespective of whether the
CH/DHW/stat switch etc. are on or off, which seems to imply that there's
an internal fault of some kind before attempting to run the CH.


There's a reset swtich somewhere IIRC.

First thanks for all the suggestions. The cutout switch I know of is on
the bottom right, but if that pops out it shuts off the DHW and the CH.
This fault is something specific to the CH.

--
bof at bof dot me dot uk