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Error code 21 on Thermador

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Oven Repair (including Ranges and Cooktops)

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I replaced the board 2 years ago and fixed the problem but now have an error code of 21 -

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  #1 (permalink)  
Old 10-18-2010, 07:56 PM
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Default Error code 21 on Thermador
Model Number: pgr484gdzs   Brand: Thermador   Age: 5 - 10 years   

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I replaced the board 2 years ago and fixed the problem but now have an error code of 21 - is this the board again? The range is connected to a surge protector - do I need a better one or is this just an unfortunate common problem.


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  #2 (permalink)  
Old 10-19-2010, 12:15 PM
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Hello,
The 2-1 error is a Potentiometer Failure. The potentiometer it's referencing is the temperature selector. It could be that that part is bad, or you have a bad wire or connection between it and the X3 plug on the relay board.

KC
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File Type: pdf profaultcodes.pdf (142.2 KB, 13 views)
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Old 10-19-2010, 03:26 PM
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Quote:
Originally Posted by Servicer View Post
Hello,
The 2-1 error is a Potentiometer Failure. The potentiometer it's referencing is the temperature selector. It could be that that part is bad, or you have a bad wire or connection between it and the X3 plug on the relay board.

KC

Any suggestions on how to check this - determine which part is bad?
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Old 10-19-2010, 05:47 PM
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You'll have to measure the resistance of the potentiometer, either at the part itself or at the X3 connection on the board.

At the potentiometer, if you measure across the pins that the white and red wire connect to, you'll read around 20.5k ohms when set to 350. If you measure from the x3 connection, you'll disconnect the harness and measure directly across the wires.
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Old 10-19-2010, 08:04 PM
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Quote:
Originally Posted by Servicer View Post
You'll have to measure the resistance of the potentiometer, either at the part itself or at the X3 connection on the board.

At the potentiometer, if you measure across the pins that the white and red wire connect to, you'll read around 20.5k ohms when set to 350. If you measure from the x3 connection, you'll disconnect the harness and measure directly across the wires.

Any description (location, how to get to it, etc) or diagram of potentiometer before I pull the range out this weekend and test it? Also, if it's is the actual part/potentiometer, do you know the part number?
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Old 10-20-2010, 01:59 PM
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To get to the back of the potentiometer, you'll need to remove the part of the cooktop that sits behind it, i.e. the burners, griddle or grill.

Attached are some pages from the service manual that pertain to the potentiometer.


The part number is 418329.
KC
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