My client's LG refrigerator is experiencing warming temperatures (31 degrees freezer, 64 degrees fresh food compartment), as well as, the Er FF code indicating "freezer fan" malfuction. Inside the freezer there was ice build up on the back wall and quite a bit on the floor. Taking the shelving out required breaking some ice away. There was water in the ice tray indicating to me that the icemaker was cycling, even with the high temperature.
I pulled out the icemaker assembly and removed the panel that covers the freezer fan. I was expecting to find ice buildup around the fan, but found that nothing was obstructing the blades. By hand the fan would spin smoothly. According to the manual I downloaded from Reg (thank you!) the fan operates at high speed at initial power-up and regular speed when the door is open. It did not run at all. I unplugged the appliance for a bit and then plugged it back in. At first, the fan moved 1/4" or so. But, that was it. Then it moved again and stopped. Then it turned on for about 1.5 seconds and stopped permanently. Pressing in the door switch did not change this. The display returned to normal, but within the time frame noted by the manual was overtaken again by the Er FF code.
Here's where diagnosing gets difficult for me. I know that this fan is a variable-speed assembly. I believe it operates on DC voltage supplied by the main board. I don't know how to test the fan motor, or how to verify it's getting constant voltage or the right voltage. There are 3 tiny wires in the fan motor harness: Red, Black, and Purple. I attempted to get readings with my multimeter, but I did not understand what I was supposed to be looking for or what the proper readings should be.
I've done very well with GE Profile and Arctica refrigerators and I assume that these LG's are not super-different, however, this is my first one and it is a little overwhelming. I feel that I am right on the doorstep of figuring it out though.
By the way, the owner told me that the dispenser light bulb turned on when the "Er FF" code first overtook the display. He could not get the bulb to turn back off, so he backed it off a bit until it did turn off.
Defrost system is working.
I am not charging my client until I can give him a firm and factual diagnosis. If anyone can offer some clarity here, I would apply it immediately to the situation.
Thanks in advance
Edited by Sunlight Appliance, 07 December 2012 - 04:41 AM.