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Whirlpool oven - no power, blank display

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Oven has had occasional problem since new (3-4 times over two years)where it would suddenly display "PF" and turn off

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Old 12-21-2008, 10:16 PM
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Default Whirlpool oven - no power, blank display
Model Number: RBS305PRS00   Brand: Whirlpool   Age: 1 - 5 years   

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Oven has had occasional problem since new (3-4 times over two years)where it would suddenly display "PF" and turn off in use. Now, the display has gone completely dark and oven appears to have no power. Resetting the breaker has no effect, however leaving the breaker off for several hours then turning back on results in oven working again (temporarily). Oven will "go dark" again, even if not used at all.

What should I check - control board? Thermal fuse?

Any insights appreciated...

-KB


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  #2 (permalink)  
Old 12-22-2008, 04:22 AM
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Here is your parts breakdown
Model RBS305PRS00

Here is your tech sheet
https://www.servicematters.com/docs/...%208301758.pdf

I would lean toward the control board being bad,.
Sounds like something on the board is heating up and causing the shutdown.
In the past it only did it intermittently causing your Power Failure error now it has become a full open.

Since I do not have info on exactly what trips the Power Failure error I would try removing and reconnecting the ribbon cable (keyboard to control).
Perhaps cleaning the connectors with isopropyl or electronics cleaner.

Most likely it is a bad solder joint on the control board or a bad winding in the transformer.
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Old 12-22-2008, 05:10 AM
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Look at #37 on the oven breakdown of your product. It is the thermostat, and it is located in the back of the oven. If you pull the oven out, and take the back off, you will see the thermostat. Make sure the oven breaker is off, and take the 2 wires off the thermostat, and put them together, and put some tape around it, so it does not hit metal, and turn the power on and see if it works. If so DO NOT run it like that, it is for testing reasons only. If it works replace the oven sensor, and the thermostat. If it does not work replace the board.
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Old 12-22-2008, 07:01 AM
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Thanks, guys...

Interestingly, the problem recurs wihout the oven being used (not heating up).

Last night I tripped the breaker back on, the oven came back in "PF" mode as expected, I reset the clock, and all was fine. This morning there was a clicking sound, then the display went back to "PF". Oven hasn't been used at all.


-KB
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Old 12-22-2008, 04:14 PM
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I agree with denman - there is an intermittent power interruption, most likely on the low voltage power supply side for the control board. Possible a micro crack somewhere or a bad winding in the low voltage transformer which breaks as soon as it heats up.

The oven shutdown thermostat, mentioned by Tom, in case if it's blown will interrupt power to the heating elements only.

- The part number for the control board is AP3873711

Gene.
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Old 12-26-2008, 05:42 PM
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Yeah, it's looking like it must be the control board. I got it working again for a few days, then it just went dark again. Heat doesn't seem to be an issue, as it does this when the oven is never even turned on.

Can I get at the control board without pulling the oven out?

Thanks again.
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Old 12-27-2008, 12:38 PM
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Quote:
Originally Posted by KingBiscuit View Post
1. ...Heat doesn't seem to be an issue, as it does this when the oven is never even turned on...

2. ....Can I get at the control board without pulling the oven out?...
1. The low voltage transformer is heating up as long as the oven powered up.

2. Yes, you can. Just open the control panel.

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Old 12-31-2008, 08:31 PM
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Thanks guys - replacing the control board did the trick.

-KB
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Old 01-03-2009, 10:22 PM
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We are glad you were able to fix it. Happy New Year!

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Old 01-04-2009, 07:03 AM
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Good Job!!! Its a good thing you didn't have to cook christmas, and new years eve dinner!!!! Tom
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