I had the same problem with this boiler. I replaced it with a generic
switch set to the same pressure but it needed a bracket made up to mount
it. The exact replacement went OOS years ago. I then inherited the
correct part recently fittted to my neighbor's scrapped boiler so it
could be returned to the pattern part.

Unfortunately both were scrapped last year.

Beware - this boiler has a positive case pressure (ie the fan is on the
aire inlet). Negative case pressure is the norm now. Be *very* careful
about the condition of the case seals and any fittings that could breach
the case. There have been deaths from CO poisoning from leaky case
seals on this unit.

Otherwise a good unit that lasted 25 years with minimal maintenance.

Chris K


Tim+ wrote:
Roger Hayter wrote:
robby m wrote:

I have a very old boiler and the air pressure switch has stopped working.
British gas has said the part - no 64220403 has been obsolete for some years.
I have tried several major suppliers with no success. Has anybody got a good
supplier who might have this..

Is there room to use a different make of pressure switch connected by
some sort of adaptor?


I dare say that any number of pressure switches would work, especially if
they were adjustable to the correct pressure. I suspect though that the
issue is that its got to be a manufacturer approved part if you ever want
profession servicing (and maybe valid house insurance).

Looking at the crazy prices on eBay for second hand pressure switches for
that boiler I would guess that it *has* to be the €œright€� one.


Tim