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Kenmore oven 790.9642240A LEFT front burner doesn't work

Kenmore oven 790.9642240A rig

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7 replies to this topic

#1 jkilgore34

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Posted 20 October 2011 - 02:48 PM

I got a call on a Kenmore oven. Customer said the stove kicked the breaker so they turned off the stove and reset breaker then turned the stove back on. They heard a loud pop and it kicked the breaker again. The left rear and left front surface elements no longer work. I ohmed out the two elements, the left rear was open so I replaced it which fixed that issue. The left front tested at about 20 ohms. I don't know if that is in range or not. I did a voltage test at the switch for the left front element and got very low voltage maybe 1 volt ac or so. I traced the wiring back to the simmer control board. The board had signs of acring on it so I replaced the control board. I also ohmed out the switch and it was bad so I replaced it.

So here is the current situation: Left rear element now working. Left front still not working after replacing the switch and the simmer control board. Still reading the same low voltage, about 1 vac at the switch between L1 and L2. *Note: While installing the new simmer control board I did bend it a little to much and heard it pop. I could have damaged the new board.

Do you think it is another bad simmer control board or is there some other things to ckeck? Does the element's resistance check within range at about 20 ohms?

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#2 jkilgore34

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Posted 20 October 2011 - 04:23 PM

Ok I realize my original post was a little wordy. Let me try again.

I'm getting very low voltage to the infinite switch for the left front surface element. I would like to do some more voltage checks. How can I do voltage checks on the simmer control board to see if it is getting proper voltage in and out of it. Also how can I do voltage checks on the cooktop lockout board to see if I'm getting proper voltage in and out of it. Is there a way to ohm out the relays on the cooktop lockout board?

#3 RegUS_PatOff

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Posted 20 October 2011 - 07:06 PM

Kenmore oven 790.9642240A right front burner doesn't work


... very low voltage to the infinite switch for the left front surface element.

... so... which Burner doesn't work ?
.

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#4 jkilgore34

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Posted 21 October 2011 - 09:17 PM

Sorry, the left front one doesn't work. The one that the simmer select control board.

The one that the simmer select board controls.



#5 RegUS_PatOff

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Posted 21 October 2011 - 09:44 PM

Remove the entire Left Front Surface Unit.
Turn the Surface Unit Switch to ON
Test for 120v AC from the following points to chassis (ground) or Neutral
Simmer Select Board
P2
P3

Surface Unit Switch
L1
H1
L2
H2

CookTop LockOut Relay Board
P6
P7

Frigidaire Kenmore 790.9642240A
316441485en.pdf
link PM'd
.

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#6 jkilgore34

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Posted 22 October 2011 - 03:44 PM

Ok. The test points I kinda understand. Can you tell me why it is important to remove the entire left front surface unit before making the tests? By surface unit do you mean the element?

#7 RegUS_PatOff

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Posted 22 October 2011 - 07:40 PM

... By surface unit do you mean the element?

yes,
or just disconnect ...
otherwise you'd be measuring 120v from L1 to chassis and from L2 to chassis
wouldn't be able to tell which "voltage source" is missing.
After determining the problem, try test again with the Element connected. :whistling:
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#8 jkilgore34

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Posted 24 October 2011 - 01:39 AM

After determining the problem, try test again with the Element connected. :whistling:


Is this like "wax on wax off?"




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