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Thermador PRSG304 troubleshooting

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I have a Theramador PRSG304 that my wife and I inherited with our house about 2.5 years ago. Before we

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Old 01-18-2018, 02:34 PM
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Default Thermador PRSG304 troubleshooting
Model Number: PRSG304   Brand: Thermador   Age: More than 10 years   

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I have a Theramador PRSG304 that my wife and I inherited with our house about 2.5 years ago. Before we moved in, we knew there were ignitor issues and the owner had a technician come out twice too fix them. The first time, the technician actually left the stove with more issues than existed before he started, so I forced the owner to get it dealt with a second time because she was reluctant to do more work. Anyway...

This oven is from the mid-90s. We have had pulsing on the oven element since we bought the oven and now it stopped lighting all together. I just realized its because the ignitor is old and the pulsing was a sign it was going out. It only gets to about 2.6A draw when on for 60s, so I am replacing that. I figured while I am in there, I should resolve the gas top issues. Here's my layout.

NW burner(has XLO)
- Has gas flow
- Will spark all burners, but only once
- To light, need to turn once to prime the gas, turn off, turn on again
- This burner makes a sound like a solenoid is being opened and closed. None of the other burners make this sound.

SW burner(has XLO)
- No gas flow
- Will not spark any burners
- Will not start with a match

NE burner
- Has gas flow
- Will spark all burners until this burner is lit
- Works perfectly as far as I can tell

SE burner
- Has gas flow
- Will not spark any burners
- Can be lit using a match

As you can see, I have basically every combination of problem here. The other thing I am struggling with is that the PRSG304 diagrams on this site are too low resolution for me to read in a way that allows me to check for any electrical issue. Any help is appreciated.


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  #2 (permalink)  
Old 06-15-2018, 01:48 PM
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Default

Have you sorted everything out yet? The left front burner probably needs either a potentiometer, and/or a solenoid. The extra low feature employs a potentiometer that controls the burner using on-off cycles via the simmer controller. Because of this feature, the extra low burners use solenoids to turn the gas on, or off to the burner. I'd be interested in what was found to be the problem with the left rear burner. Spark ignitor problems can be caused by bad grounds, or even reversed polarity at the receptacle.
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