Frigidaire wall mounted oven broiling but not baking

[John.Smith]

Hi,

I have a Frigidaire (Electrolux) wall mounted oven that stopped baking recently. I suspected the temperature sensor and replaced that with a new part. The broil/grills works properly, when set to broil, the broil element inside the oven heats up quickly, turn orange and works fine. The newly replaced temperature switch comfirms this, as temperature changes show on the oven display.

The lower -- bake element doesn't seem to do anything. I have accessed the bake element ends from the back of the oven. After disconnecting them from their wiring, I did a continuity test and the element measured 26 ohms. I understand that this means there is no damage or integrity problems with the element itself.

Not sure how to diagnose the problem after this. I was also looking for a overheating sensor switch to reset that. I understand that this sometimes gets tripped up after selfcleaning. I have not done any selfcleaning but thought a reset wouldn't do any harm. However, it seems this switch is not located on the back of the oven for my model?

Finally, my model # is CGEB27S7CB1.

I appreciate any help with this.

John.

[Hiroshi]

The next best step is to determine what voltage you are getting to the element when the BAKE cycle is selected... this is where the stakes get dangerous as it will require "live" testing with the machine powered-up.

Do you have the tech sheet that came with the unit? ...you will want to look at the wiring diagram, there is a Relay in the bake circuit that is not part of the control board

Does the convection element and fan motor work?

 

Edited January 5, 2017 by Hiroshi

[johntech]

Most likely you will need the control board. If your voltage testing determines you are not getting 120 vac out of the bake relay on the board. The bad news is the control has been discontinued. You may be able to find a company to rebuild it or if you have good soldering skills you may be able to replace the relay itself. Part number: 318010701

[John.Smith]

On 1/5/2017 at 2:10 PM, Hiroshi said:

The next best step is to determine what voltage you are getting to the element when the BAKE cycle is selected... this is where the stakes get dangerous as it will require "live" testing with the machine powered-up.

Do you have the tech sheet that came with the unit? ...you will want to look at the wiring diagram, there is a Relay in the bake circuit that is not part of the control board

Does the convection element and fan motor work?

 

Yes. the convection element and fan motor both work. Not quite comfortable with the live voltage testing though :-)

[John.Smith]

On 1/5/2017 at 2:34 PM, johntech said:

Most likely you will need the control board. If your voltage testing determines you are not getting 120 vac out of the bake relay on the board. The bad news is the control has been discontinued. You may be able to find a company to rebuild it or if you have good soldering skills you may be able to replace the relay itself. Part number: 318010701

Yeah, I noticed the control board is nowhere available. I found a small number of companies that do repair work on the control board, maybe that's an option. I have not however, yet determined that it was the control board that's faulty. The panel on the inside had three relays. I have disassembled all of that panel, and have the three relays. They are all the same, part No 318112701. I should perhaps test those with a multimeter. So far I only established that they show a 80 ohm resistance on two of the connectors. Not sure what to do next.

I have also taken out the entire control board. I was hoping to inspect the soldering and see if there are loose ones that need resoldering. However, the control unit is comprised of two boards sandwiched in a plastic housing that appears brittle. I am not sure how to get the boards out of their housing to inspect the back of each.

Thanks,

John

 

[johntech]

If the relay is bad you will normally not be able to tell visually. Most of thoes Frigidaire boards have labeled terminals. The one that say ba is bake. Turn on bake and test for 120vac on that terminal and the neutral terminal or white wire. I can certainly understand why you would be apprehensive with live testing so another option would be to switch the terminals for bake and broil at the board and See if the problem changes to the broil element. If so then you know the board is the culprit.

[John.Smith]

ok so here is the epilog to this little story. I wasn't too comfy to do live wire testing, so I didn't do it. I was however intrigued to inspect the motherboards on both sides. I had a friend help me understand the wiring diagram, and then establish that the problem was with the bake relay on the board. Sure enough, once I opened the control unit, the back of the bake relay had a connector that needed resoldering. Problem solved, not eating cookies, but oven baked pizza instead.

Thanks for all the help.