On Thu, 12 May 2005 09:20:07 +0100, Edwin Spector wrote:

raden wrote:
...
Best first to check that the solenoid isn't open circuit


The solenoid is indeed open circuit. When it's switched on, it has 240V across
it, but nothing happens.

I learned that Honeywell do replacement operators (solenoids) for their valves.
Details at
http://content.honeywell.com/uk/home...s%20Spares.pdf

I expected that to be a cheaper solution than replacing the entire valve
assembly, and a lot easier.

Ed Sirett wrote:
...
The valve used is a multifunction unit.
It comprise the thermocouple valve, pilot supply, solenoid valve and
gas pressure regulator. The operating solenoid is integral with the whole
valve.

After the main valve (likely £50-100) is replaced you would adjust the
pilot flame and set the burner pressure to that indicated on the rating
plate then confirm that the gas rate is 90-105% of the intended rate.

Thanks for that. How is gas rate measured? Also, how is the pilot adjusted?

Some but not all solenoids can be exchanged.
Gas rate is maeasured as detailed in the gas fitting FAQ
The pilot is adjusted be the pilot adjusting screw on the multifunction
valve.

--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://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