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Oven Preheats well, but won't maintain temp

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My GE electric oven (model # J BP78G S2BB) will preheat perfectly, but the temperature drops steadily without reheating to

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  #1 (permalink)  
Old 12-14-2008, 07:38 PM
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Default Oven Preheats well, but won't maintain temp
Model Number: J BP78G S2BB   Brand: GE   Age: More than 10 years   

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My GE electric oven (model # J BP78G S2BB) will preheat perfectly, but the temperature drops steadily without reheating to maintain temperature.

If I turn the oven off every few minutes, then reset the temp dial, it will keep baking (the heating elements will produce heat until the proper temperature is reached). If I don't keep doing this the oven just steadily cools.

I have a medium amount of electrical knowledge. I can do some basic stuff with a volt-ohm meter. I am trying to decide whether to attempt a repair myself, or just buy a new oven/range. I don't want to end up replacing all the possible problem parts then also end up paying as much as purchasing a new oven. Similarly, I suspect that paying a repairman to come out and fix it will cost a significant percentage of a brand new appliance.

I was hoping it would be something as simple as replacing a relay - but I'm not sure this oven uses one to regulate the temperature.

Anyone willing to help me take this on?


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Last edited by craigdblom : 12-15-2008 at 04:10 PM.
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  #2 (permalink)  
Old 12-15-2008, 08:53 PM
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Most likely the problem is a bad control board which has to be replaced together with the face plate according to the manufacturer instructions.

- The part number for the control board is AP2026779

- The part number for the face plate is AP2025969

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Old 12-16-2008, 05:22 AM
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Default test before repair?

First I want to say thanks very much for the help.

Is there a way I can test the control board to be sure that is the problem before I replace the parts?

AND

Are there other likely causes if that doesn't do the job?
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Old 12-16-2008, 05:27 AM
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First I want to say thanks very much for the help.

Is there a way I can test the control board to be sure that is the problem before I replace the parts?

AND

Are there other likely causes if that doesn't do the job?
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Old 12-16-2008, 07:49 PM
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I do no think it is possible to diagnose the electronic control board without very special equipment and the complete technical specifications.

I do not see anything else what can cause such problem.

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Old 12-16-2008, 08:33 PM
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Thanks, Gene, for taking the time to help.

Much appreciated.
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