Need help with a schemetic diagram.

Old 12-31-14, 11:41 AM
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Need help with a schemetic diagram.

This is the wiring diagram of a Frigidaire wall oven, which has stopped working.
there is a thermal safety switch on one leg of the 240 volt line. If I understand the thinking of this layout, the thermal switch should be normally closed, and open when the temperature of the sensor rises to some temperature, say 150F. this link shows the wiring diagram.

Parts for Frigidaire PLEB30S9DCA: Wiring Diagram Parts -

Here is the problem. I measured the voltage on both sides of the switch. 240 is on one side, but not the other, which prevents the circuit from completing, and of course, no voltage to the elements. I ordered a replacement thermo switch thinking that is was open, but the new part was the same. Normally open.

I do not see how this could possibly work. I would like a second opinion, and please feel free to correct my thinking... It makes no sense to me at all.
Thanks in advance.
Old 12-31-14, 02:43 PM
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Which device on the drawing? Two of the sensors appear to work the opposite as they closes with temp to engage a fan.

It is possible you got a new bad switch.
Old 12-31-14, 03:22 PM
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What is the issue you are trying to if?has the oven completely stopped working?
Old 12-31-14, 04:04 PM
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I'm on the road and just passing thru. From what I can see you don't have any stats in the bake or broil lines. The power comes directly from the control board.

Turn the power off. Pull the element out and make sure the ends can't touch metal. Turn power back on and in bake mode check for 240vac at the element. If it's present... the element is bad. If voltage is not present the control board has an issue.

It is extremely common to find defective solder connections on the control board in the area of the heavy relays. If you are electronically inclined you can resolder the relays yourself. If not.... you need to confirm no power is leaving the control board and if not... replace the control board.

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