I went out to look at a GE freezer on top ref. M# GTS22KCMBRBB. Customer said it was not cooling properly. When I got there the Ref was about 41 degrees.
I first checked the mother board on the back and everything seemed fine. The evap seemed to be frosting up nicely. I then started to watch the evap fan and it was really not blowing at a good stable speed. It seemed to be going up and down in rpms and never getting to a steady speed. I suspected it was going bad and then replaced it and when I first put the new one in, it ran good and strong. Then after a few minutes of operation, it started to do the same low rpm up and down pattern.
In the manual, it says that the DC motor has a rpm gain and loss at the low and mid speeds, but this seems really low.
When I put the meter on the wires at the board I got really low voltage, around 1 VDC and not steady.
Also, there was tape around the connector for the evap and condenser fan. When I took the tape off, there was a small resistor wired in across the red and blue wires. Blue is the tachometer and red is the 12 VDC power supply.
The board had no signs of being bad. I have replaced a few of these boards and usually there is evidence of something burnt out.
Does anyone have any thoughts on this? Luckily the people are nice and the Ref is in the garage, so it is not that big of a deal.
Any help would be great. Thanks.