On Wed, 22 Sep 2004 17:15:01 +0100, Mungo "two sheds" Toadfoot wrote:

Christian McArdle wrote:
I've got a New World Royale 600 gas cooker with a self-lighting oven
- you turn the gas on and the sparker clicks away until the oven
lights.

First, how's it do that then?

Hardly rocket science.


Probably not, but then I don't think tiling is rocket science, or earth
bonding, or a lot of the questions asked here.

OK. I'm not familiar with this model but other models which work like this
do the following:

Attached to the spindle of the gas knob is a microswitch unit which powers
the sparker.
The electrodes of the sparker once the gas is lit are immersed in the
flame this means the that although the sparker is running the mini bolt of
lightning is shorted out by the flame and can't be heard. [2]
All the rest of the operation (flame failure detection and regulo stuff)
is the same as all other ovens.

[2] I beleive the Pott. Netaheat boilers work like this also.


Second, it only works when it feels like it - about 7 times in 10.
Any idea why?

Duff microswitch unit on the gas knob.
Poor HT cabling, Poor/eroded electrodes...

Most other things are more likely hard faults.


--
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
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