On Wed, 13 Oct 2004 00:50:41 -0700, steve wrote:

Ed,

It's definitely in the 'a' category. Permanent pilot, no electronics,
no controls other than the stat and the pilot ignitor. All the wiring
and controls are seperate - junction box in the airing cupboard
linking the valve, hot water cylinder stat etc... and a seperate
timer/programmer control unit.

Coming into the boiler is just one live supply which is then directly
and only linked to another wire going into the gas valve unit. Boiler
themostat is a seperate box which seems to be wired directly into the
gas valve unit (and obviously the sensor going into the heat
exchanger).

There's nothing else of note in the boiler, no PCB or warning lights.
Seems everything is contained within the gas valve unit.


Have you put a probe/multi-meter or neon tester on the gas valve?
This will split the problem between the gas valve or the thermostat.
My gut feeling is that it will be the thermostat because you find that you
need to turn it down and up to get a result.

The themrostat is like less than £20.
If you replace the gas valve make sure you know what you are doing.

--
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