Dave Ramage wrote:

I sure that there is a running thermostat which is the one with the knob
and numbers.
If this does not cut out the boiler well before it boils then there is a
problem.

IIRC there is also a high limit over heat cut out - which is manually
resettable.

Both operate from a copper bulb inserted into a pocket into the heat
exchanger.

The fact that neither is operating is cause for concern.

Whether or not the problem is coincidence the problem needs attention.

Ed,

Thanks for your input. I did some testing with a multimeter and
concluded that the thermostat *was* openning after about 20 minutes,
but the PCB was ignoring this. CORGI guy is fitting a new PCB- this
time a new one, as the recon PCBs don't seem to be relyable!

Grr! The guy is meant to know that checking the operation of the
thermostat is a basic safety check...
but we all make mistakes...


--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html