LRE3083ST LG Electric Oven Not Heating to Correct Temp

[krisdurb]

Model Number

LRE3083ST

Brand

LG

Age

6-10 years

I have an LG oven that is approximately 6 years old that is not heating to the correct temperature. The oven pre-heats in the normal amount of time and says that it has heated fully, then does a normal re-heat cycle. This is the case for both convection and regular bake. I have manually adjusted the temperature to the maximum 35 degrees, but the oven continues to gradually deviate from the correct temperature. The temperature does not fluctuate once it gets to the temperature it thinks it needs to be at. The symptoms are that the oven was not cooking properly and I have verified the temperature with a precision oven thermometer.

I also replaced the thermostat, thinking that the resistance reading was not correct, but the problem is identical with the new thermostat.

My next thought is the computer board. I wouldn't think it was the heating coil, because the problem isn't with the oven getting hot -- it is with the oven reading the temperature correctly. Am I correct?

 

[rickgburton]

I also replaced the thermostat, thinking that the resistance reading was not correct,

Are you referring to the oven sensor? It should be around 1100Ω at room temperature. Check both elements for continuity.

LG EBR77562705 Pcb Assembly, Main - AppliancePartsPros.com

PCB ASSEMBLY, MAIN EBR77562705 / AP6040054 made by LG

click.linksynergy.com

 

[krisdurb]

Yes, the temperature sensor. I would love to check resistance on the probes, but the included wiring harness has needle sized holes. No multimeter probe can fit in there and even the smallest copper wire cannot fit in there as an extension too. I tried. Bought the new sensor and same behavior, so pretty sure it's not the sensor.

 

[krisdurb]

Also, your attached link to a PCB -- that is most certainly the wrong PCB for this model.

 

[rickgburton]

No multimeter probe can fit in there

that is most certainly the wrong PCB for this model.

It most certainly is not. Unless you gave me the wrong model number.

 

[krisdurb]

View attachment 53771

It most certainly is not. Unless you gave me the wrong model number.

Beating a dead horse here. Already tried that and still won't fit in the harness. But once again, that's why I bought a NEW sensor. Not a coincidence that the behavior is EXACTLY the same, so I think we can put that to bed.

And yes, it most certainly is. The correct PCB is model EBR741648 and yes, the model in the post is correct. I am sorry your website is wrong. But no context as to why you shared that anyways. Are you saying it's likely the PCB? If so, just say that.

 

[rickgburton]

Wow, you're an ornery cuss!
I know you replaced the sensor. I can read. I was only showing you a way to get into tight places using a safety pin.

Already tried that and still won't fit in the harness

You're the only one so you must be doing something wrong. Maybe you're in the wrong spot. They make different size pins.

But no context as to why you shared that anyways.

Because you said:

My next thought is the computer board.

Did you forget that thought?

Are you saying it's likely the PCB? If so, just say that.

I thought I did say that

It should be around 1100Ω at room temperature. Check both elements for continuity.

I said if the sensor is good, and the elements are good, that's the only thing it can be.

I am sorry your website is wrong.

We don't have a parts website.

And yes, it most certainly is. The correct PCB is model EBR741648

MOST CERTAINLY IS NOT YOU ORNERY SOB.....

But since you're obviously not going to listen to me, look it up yourself.

 

[Jake]

Rick, I think he means the relay PCB board in the back of the range.

LG EBR74164805 Pcb Assembly - AppliancePartsPros.com

PCB ASSEMBLY EBR74164805 / AP5785752 made by LG

click.linksynergy.com

EBR741648

But he left out the 05 at the end.

Jake

 

[rickgburton]

Oh OK

 

[Firefighter1230]

Oh OK

Hey Rick. I’ve seen a few issues on here. I also have an LRE3083ST. No oven heating at all. No preheat no broil. A few of the other threads I’ve looked at makes me suspect the pcb that you mentioned earlier. I don’t have any manuals for it. Is there a diagnostic chart to check out before throwing a $300 board at it? Or do you suspect that to be the case? Could it be the relay board also mentioned in this thread? Thanks for any info!

 

[rickgburton]

I don't have the wiring diagram for that model. Check for 220 VAC at the relay board then check your output voltage to the relays.

 

[Firefighter1230]

I don't have the wiring diagram for that model. Check for 220 VAC at the relay board then check your output voltage to the relays.

So if I have it to the relay board, the main pcb should be ok. If I don’t, probable main pcb?

 

[rickgburton]

correct

 

[Firefighter1230]

correct

I found a melted relay on the relay board. Replaced the board and still no heating. Likely main pcb?

 

[rickgburton]

Replaced the board and still no heating. Likely main pcb?

Probably but it's rare to have more than one part fail at a time. Check the wiring.