KitchenAid KEMS378S combo oven F6E0

Oven/Range/Cooktop Repair
1

Shortly after end of 1 year warranty, KEMS378SSS04 began displaying F6E0 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?

2

For the benefit of KEMS378SSS04 owners diagnosing F6E0 on the left side panel (lower oven ui), here is the actual resolution.

In this case, the Kitchenaid F6E0 on the left side (lower oven ui) was caused by a misbehaving right side panel (microwave oven ui W10118735), although no error or loss of functionality appeared on the ride side panel or microwave. Kitchenaid F6E0 error reporting and diagnostics seem to be unreliable, which hinders diagnosis. Turning power off and on often temporarily fixes the problem, but also hinders diagnosis since it may take hours or days to verify whether the problem is permanently resolved.

When diagnosing F6E0 on the left side panel, if wiring (upper and lower harness), electronic boards, and connectors appear ok, and the problem is not with W10118734 (lower over ui) or W10119143 (lower oven appliance manager), you may want to try replacing W10118735 (microwave oven ui). This is an easy fix behind the front panel, so if you have the part, you may even want to try it before the difficult-to-access lower oven appliance manager.