View single post by stainlesssteel
 Posted: Thu Dec 7th, 2006 01:04 am
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stainlesssteel

 

Joined: Sat Dec 2nd, 2006
Location: San Diego, California USA
Posts: 55
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Thanks for the reply.

I don't see how a bad #2 burner (surface unit) switch could be the problem.

As I understand it, all the electrical switch integrated in the burner knob does is connect line voltage to the spark module. The spark module uses this information to send kilovolt level voltage to all 4 sparkers.

Since the sparkers (all 4 by design) start sparking when the #2 burner knob is turned on, the switch in the #2 burner appears to be doing its job. It's just that sparking continues even after the #2 burner flame lights.

If my understanding of the surface unit switch is correct, it receives no feedback as to whether the burner flame is lit. Therefore it has nothing to do with the sparkers continuing to spark even after #2 flame ignites.

My best guesses
1) spark module is not correctly detecting whatever feedback it receives through the sparker. I assume this feedback is the sparker's heat-dependent electrical resistance. There is only one wire from the burner to the spark module....the sparker wire...that is, there are no other wires for, say, a heat or flame sensor.
2) electrical resistance vs. temperature curve of the sparker is not what the spark module expects. This could be because it's the wrong sparker (quite possible, as I had no part number when I bought it--the guy at Coast Appliance just matched the sparker to the old one I brought in on looks) or it's defective--aging, heat damage etc.

Therefore the best things to try replacing are the spark module, then the #2 sparker.

Am i missing something?

What would really help me is more detail on how the spark modules senses flame. Does anyone have a schematic for this sort of spark module, or know generally how they sense flame and/or temperature?



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