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Thermador Oven Problem
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Model: PRG304 Brand: Thermador Age: 5 - 10 years
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Servicer  
#11 Posted : Friday, October 8, 2010 10:32:17 AM(UTC)
Servicer

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Groups: Senior Expert
Joined: 2/29/2008(UTC)
Posts: 191
Originally Posted by: Jim-C Go to Quoted Post
I ordered the new parts. I'll update my results as soon as I get the parts and install them.

BTW, is there any problem testing the resistance of the new glowbar with my meter before I install it? Can I damage it in any way? I'm just curious to see what my meter will show...



Nope, you'll be fine.
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Jim-C  
#12 Posted : Monday, October 11, 2010 7:01:52 AM(UTC)
Jim-C

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Joined: 9/29/2010(UTC)
Posts: 8
I got the parts and installed them. The oven works great now. Servicer, I do have one final question just for my general understanding:

My understanding of the way this system works is that power comes from the wall, through the hot side of the terminal block to the T-stat. The T-stat acts as a switch that when turned on sends power to the relay. The relay acts as a switch that either sends power to the top or bottom of the dual gas valve depending on if the T-stat is on bake or broil. After the dual gas valve, power flows to the glowbar and finally to the neutral side of the terminal block. So the question is, what keeps the gas from flowing if the glowbar is beginning to fail as in my situation?

Looking back on my experience (hind sight is 20:20) I now recognize that when I first would turn on the oven, the glowbar would glow and gas would flow, but the flame was minimal. After the initial heat up (which would take forever) the glowbar would glow but the flow of gas was so low it would not ignite. So while I could see the glowbar glowing and smell gas, the oven would not work.

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Servicer  
#13 Posted : Monday, October 11, 2010 7:46:56 AM(UTC)
Servicer

Rank: Advanced Member

Groups: Senior Expert
Joined: 2/29/2008(UTC)
Posts: 191
Originally Posted by: Jim-C Go to Quoted Post
So the question is, what keeps the gas from flowing if the glowbar is beginning to fail as in my situation?



When the current drops, the bimetal within the valve cools and retracts. This then closes the valve, stopping the gas flow.

http://www.robertshawtstats.com/spaw2/SiteContent/Files/faq/ControlTips-GasRangeIgnitors.pdf

Clink on the above link. The paragraph below figure 3 better explains bimetal operation.
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