I have a Kenmore HE 2 Front Loading Washer, model #11047532601 (purchased new September 2006).Yesterday it stopped in the middle of a load and gave error code F28. I powered off and re-ran, and got same error. I performed the starting service history mode & diagnostic test (push button 4 seconds, release 4 seconds, push 4 seconds....
Make: KenmoreModel: XXXXXXXXXXX
Error codes were F28 (serial communications error), and F21 (long drain).
I removed the front bottom access panel & cleaned out pump motor filter
(loose change, broken pens, etc).
I discovered a piece of fabric had gotten past the filter and jammed into the pump itself.
I removed and cleaned the pump assembly and main hose (with ball valve),
and verified (by blowing through it) the drain hose was clear of obstructions.
Measured resistance across pins 1 & 2 of pump motor varies from 12.0 - 12.5 ohms.
After reassembly, I ran both the "Clean Washer" and "Rinse/Drain & Spin" cycles successfully.
Washer seemed to work & drain just fine.
I reloaded the laundry and ran a normal cycle. Again, Error F28.
Now when I check the service history I only get F28. F21 is no londer being reported.
I reset the load, double-checked the drain filter (clean) and ran a "Rinse/Drain & Spin" cycle successfully.
This "cycle" repeats every time. A normal load will throw error F28,
and a subsequent "Rinse/Drain & Spin" will sometimes fail (F28), and sometimes succeed.
I've tried to do the Diagnostic test (by following the instructions in the "Technician Only" booklet #W10071740),
and I'm fairly certain that it is not working. Meaning, I do what it says, and the machine does nothing.
I've inspected the wires / connections, and they all appear clean and tight.
The machine is out of warranty. Any ideas?
Do I call Sears and have a technician sent out, or do I just take a gamble that it is a bad Control Unit and replace it?
Any help will be greatly appreciated.
ok so F28 is a very very bad error code. Doing the diagnostics test will get you nowhere. The problem means that either your machine control board or the motor control board has gone bad and needs to be replaced. The bigger problem, is that there is no way to determine which one is at fault until you replace a part to see if it fixes the problem or if you need the other board. For this reason, it might be best to call a technician unless you have a place that will allow you to return the part you don't need, because you won't need both, you just need one of the two to fix the problem. If I were to guess, I'd say replace the main CCU or "central control board" first as this one tends to have solder joints break on it due to the shaking in the spin cycle.
As I don't have a true service manual (just the little booklet), can you tell me where / how to find / remove the CCU and MCU?
certainly. Just pull the washer forward and remove the 3 screws along the back holding the top panel on. Once the screws are removed the top panel will pull straight back and up to remove. The main CCU is located in the front right corner and it looks like a plastic rectangle with lots of wires going into it. This is the part you need to order and replace.
7+ years being an appliance technician with factory training