Shortly after end of 1 year warranty, KEMS378SSS04 began displaying F6E0 Lost Communication on lower over UI (not on the microwave). Turning power off/on (multiple times required sometimes) fixes the problem temporarily for hours or weeks, but the problem always returns. 1) When the problem occurs, the oven light still works. Power at the lower oven manager and lower oven user interface harness connections tests good (12VAC blue/yellow). Power from the user interface transformer tests good. 2) Ground at breaker panel, wall junction box, and oven appear good. All connections to oven manager, user interface, touch pad, and transformer appear good. All electronic components appear in good condition. 3) Replacing lower oven manager and lower oven user interface boards made no difference. 4) Replacing upper wiring harness between lower oven manager and lower over user interface boards made no difference. 5) Replacing the UI power transformer made no difference. 6) L1 and L2 filters test ok except that L2 has high resistence between terminals 3 and 4 instead of 660-700 per KitchenAid diagnostics. A new L2 filter tests the same, so KitchenAid disgnostics appear wrong. Components not replaced yet: 1) Touch pad 2) L1 and L2 filters 3) Microwave oven manager, user interface, and WIDE boards 4) Fuses and thermostats 5) Lower wiring harness Not yet tried: 1) Contract a licensed electrician to verify grounding again 2) Replace the lower oven manager and user interface boards again in case the first replacement parts were bad Anyone have experience with F6E0 on this or similar models? How was the problem resolved? What should be the next step?

Last night I saw the lights in the house flicker momentarily... This morning, I turned the oven on, set it to Bake and within a few seconds, the control panel reported error code "F6 E0" then shut the oven off. The control panel also reported "Lost communication...". I read on another site that this code may require replacing the control panel itself. Apparently, the momentary power fluctuation wasn't large enough to damage the electronics (since the control panel still works), but was significant enough to confuse the electronics controlling the oven. To fix the oven, I simply turned the 30 AMP breaker for the oven off for about 5 minutes. When I turned it back on, the oven worked just fine. Solution #1 recommends taking off the control panel, which voids the warranty. It's more likely that it was fixed just by cycling power to the oven via the breaker. if this does not help tell me so that we can proceed next,

Hi,

Below is the complete instruction sheet.

You are having a communication error between the appliance. Here is the actual tech manual instructions for that code:

PROCEDURE: Before proceeding, press OFF, OFF, START to enter Diagnostic

mode and verify the error codes. Ensure AM software, UI software and EEPROM

CHECKSUM versions appear on the lower text line. If AM software and EEPROM

versions do not appear, UI and AM may not be communicating. Verify this for the

lower oven UI and for the microwave (upper oven) UI. The lower oven UI will show

the AM software version for the lower oven appliance manager, and the microwave

UI will show the AM software and EEPROM versions for the microwave appliance

manager.

If the lower oven UI is not displaying the AM software version, go to UI IS NOT

DISPLAYING AM SOFTWARE VERSION.

If the upper oven UI is not displaying the AM software and EEPROM versions,

go to UPPER OVEN UI IS NOT DISPLAYING THE AM SOFTWARE AND

EEPROM VERSIONS.

If lower oven UI and microwave UI are both displaying an error, go to LOWER

OVEN UI AND MICROWAVE UI ARE BOTH DISPLAYING AN ERROR.

UI IS NOT DISPLAYING AM SOFTWARE VERSION:

A. Unplug oven or disconnect power.

B. Open the back panels and make sure the P6 and P2 connectors are fully

inserted on the appliance manager and on the lower oven user interface board.

- If they are not plugged in, plug in connectors and go to step F.

- If they are plugged in, go to step C.

C. Visually inspect all wires between P6 on the appliance manager and P2 on the

lower user interface.

- Make sure wires are not cut or pinched.

- If the wires appear to be intact, perform a continuity check between

P6-1 of the appliance manager and P2-1 of the user interface board.

Complete for P6-2(AM) to P2-2(UI), P6-4(AM) to P2-4(UI) and P6-5(AM) to

P2-5(UI). All the measurements made should be less than 5 ?. If any of

these measurements exceeds 5 ?, go to step E.

D. Replace the appliance manager. Ensure all connectors are properly inserted.

E. Replace the wiring harness (signal). Ensure all connectors are properly inserted.

F. Replace all parts and panels before operating.

G. Plug in oven or reconnect power.

H. Observe for longer than 1 minute to determine if error has been repaired.

I. If error does not appear, initiate a bake cycle. Let the cycle run for at least

1 minute.

- If no error occurs, cancel the cycle, the problem has been repaired.

- If error occurs again, restart the troubleshooting procedure at step A.

At step D, replace the lower oven user interface board if appliance

manager has already been replaced.
- If both are replaced the problem has been repaired.

Let me know,if needed further assistance.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!