F9 error code

[cklassen]

Just wondering if anyone knows what the F9 error code stands for for LG walloven model# LWS3081st?

[cklassen]

Never mind. Found the Service manual.

[AJ]

Never mind. Found the Service manual.

Maybe you could share with us what F9 means then incase someone else comes searching for the answer. thanks.

[cklassen]

F9 stands for no heating. It will be displayed if oven temperature in oven does not exceed 150F/66C in less than 5 minutes.

[AJ]

Thanks, please let us know what you end up finding wrong with it.

[cklassen]

So went to customers home and tested the oven according to the service manual and it seems to lead me to the relay board. However all the service manual says is to try the relay board and if that doesn't work replace the main PCB, does anyone know if there is a way to narrow it down as this is a non-warranty job? Also after I tested things and power was reapplied I tried the oven and it started to preheat on bake and I went to see if it was heating and the door was locked, I'm not sure if that clarifies anything because both the main pcb and the relay board control the door lock. Any thoughts?

[tgoods]

If you can get access to the back of the relay board, check for voltage to coil of the relay. If there's voltage and the relay is not closing, you know the relay is bad.  I'm thinking the door locking was just a power failure self check, assuming it eventually unlocked on it's own.

[domain]

You have to check for your low voltage to your relay pcb. This can be tricky due to the High Voltage side . These relays are often put under massive stress and they seem to be failure prone! I also assume you checked your safety thermostats? If the customer recently put this into SELF CLEAN the safety may very well have tripped. This will cause a no heat condition but NOT shut down the rest of the stove. (IN WALL models only unless i'm mistaken)