Kenmore Washer F28: Communication Lost Between Boards

Cost-First Assessment

Your Kenmore washer displays F28 — a communication fault between the central control unit (CCU) and motor control unit (MCU). Here is what this repair typically costs:

Best case (65% of occurrences): $0 — corroded connector that needs cleaning Common case (25%): $120-$220 — one control board needs replacement Worst case (10%): $270-$450 — both boards damaged from the same electrical event

Kenmore washers displaying F28 have a favorable repair outcome ratio. The majority of cases resolve with connector maintenance rather than part replacement. Whether your specific case falls in the "$0 fix" or "$300 repair" category depends on a few diagnostic steps explained below.

Worth Repairing? Here Is How to Decide

If your Kenmore washer is under 8 years old, F28 is nearly always worth diagnosing and repairing — even in the worst case ($450 for both boards), you are still well below the $800-$1,200 replacement cost of a comparable new washer with years of life remaining.

If the machine is 10-12+ years old, the calculation shifts: do you hear any tub bearing noise (rumbling during spin)? See any rust on the frame? Notice tub seal leaks? If yes to any of these, the machine has multiple age-related failures converging. A $200+ board repair buys you another year or two before the next expensive failure. At that age, weigh repair cost against putting that money toward a replacement.

Under 8 years: Repair without hesitation 8-10 years, no other symptoms: Repair — good value 10+ years with bearing noise or leaks: Consider replacement

What Exactly F28 Means

On Whirlpool-built Kenmore washers (model prefix 110.xxxxx — verify your prefix before proceeding), the CCU and MCU communicate over a serial data link. F28 and F11 both indicate communication failures on this link, but they trigger from different conditions:

• F11 triggers when the CCU sends a command and receives no acknowledgment
• F28 triggers when the MCU fails to respond to a specific initialization handshake at startup

Practically speaking, F28 tends to appear immediately at power-on or at the beginning of a cycle, while F11 can appear mid-cycle. The root causes overlap significantly, but F28 more often points to an MCU that has completely lost its firmware state or has a dead power supply section.

Platform note: This is exclusive to 110.xxxxx (Whirlpool). LG-built Kenmore (796.xxxxx) uses "PF" for power/communication faults. Frigidaire-built (417.xxxxx) does not separate board communication into its own error code.

DIY Savings Opportunity

The connector-cleaning fix is the highest-value DIY repair opportunity on F28 because it requires no parts, minimal tools (screwdriver and contact cleaner), and resolves the majority of cases.

What you need: Phillips screwdriver, electrical contact cleaner spray ($8 at any hardware store), clean cloth.

The repair:

1. Unplug the washer completely from wall power. Wait 3 minutes for board capacitors to discharge.

2. Access the CCU: Remove the three screws along the top rear edge of the control panel. Lift and tilt the panel forward. The CCU board is inside a plastic enclosure — open it by releasing the cover tabs.

3. Find the main communication connector: It is the largest multi-pin connector on the CCU board — typically white or beige, with 8-16 wires running downward through the machine to the MCU. Disconnect this connector by pressing its release tab and pulling straight out.

4. Inspect the pins: Look for green/white oxidation, blackened spots (arcing damage), or melted plastic around pin positions. Even light oxidation creates enough resistance to corrupt the low-voltage data signals.

5. Clean: Spray contact cleaner generously on both the plug pins and the board receptacle. Use a clean cloth to wipe accessible surfaces. Let it air-dry for 60 seconds.

6. Reconnect firmly: Push the connector back until you hear/feel the latch click. A connector that sits 1mm too shallow can cause intermittent F28.

7. Repeat at the MCU end: Access the MCU (rear panel on front-loaders, bottom of machine on top-loaders). Find the corresponding connector and repeat the cleaning process.

8. Test: Reconnect power, start a cycle. If F28 does not appear and the machine operates normally through a complete wash cycle, the repair is complete.

When Connector Cleaning Fails

If F28 returns after thorough connector cleaning, one of the boards has an internal failure:

Identifying Which Board Failed

Quick indicator: After unplugging the machine for 10 minutes (long discharge) and replugging, what happens?

• Machine shows F28 immediately with no delay → likely MCU (cannot complete startup handshake)
• Machine powers up normally, begins filling, THEN shows F28 when motor should start → likely CCU (transmitter works for basic functions but fails under load)

Definitive test (if you have access to a second machine or known-good board): Swap one board at a time. If borrowing parts is not practical, a technician with specialized equipment can probe the serial data lines to see which side is transmitting and which is silent.

Board Replacement Tips

When ordering a replacement CCU or MCU for a Kenmore 110.xxxxx:

• The part number is printed on the board itself (look for a sticker or silkscreened marking starting with W10...)
• Searching by your full Kenmore model number on PartSelect automatically maps to the correct Whirlpool board
• Generic "Kenmore washer main board" searches return wrong results — always use the specific part number
• Before disconnecting the old board, photograph every single connector and its position — boards have many identically-sized connectors that can physically fit in wrong locations

CCU boards: $120-$200 typical MCU boards: $150-$280 typical

Prevention

The #1 cause of F28 connector corrosion: moisture. Washing machine environments are inherently humid — steam from hot water cycles condenses on electronics. You cannot eliminate this, but you can reduce its impact:

• Ensure your laundry room has ventilation (even a bathroom exhaust fan helps)
• After the last wash of the day, leave the washer door ajar to vent residual humidity from the tub (rather than trapping it inside where it condenses on interior surfaces and electronics)
• If your laundry room lacks climate control, consider a small dehumidifier during wet seasons

Important Note About Kenmore Parts Ordering

Because Kenmore is a multi-manufacturer brand (not a maker itself), parts must be ordered by the actual manufacturer's part number — not by searching "Kenmore washer parts." Your model number prefix identifies the real manufacturer:

For washers: the most common Kenmore washer manufacturer is Whirlpool (prefix 110.xxxxx for washers/dryers, 665.xxxxx for dishwashers, 790.xxxxx for ovens). Parts websites like PartSelect and RepairClinic accept your full Kenmore model number and automatically cross-reference to the correct OEM part number. Always verify the part number matches before ordering — similar-looking parts from different manufacturers are not interchangeable even though both machines say "Kenmore" on the exterior.

The Sears Parts Direct website (now Partstown) also stocks these parts but typically at a higher price point than ordering the OEM part directly from an appliance parts wholesaler. Shopping by the OEM part number rather than the Kenmore part number often saves 20-40% on identical components.

Extending Your Kenmore Washer's Lifespan

Regular maintenance prevents many error codes from developing in the first place. For your Kenmore washer, the most impactful maintenance items are:

Monthly: Run a clean cycle (dedicated Clean Washer cycle or hottest cycle with no clothes and a washer cleaner tablet). This dissolves detergent residue and mineral deposits that accumulate in the wash system, drain path, and sensor areas. Residue buildup causes false sensor readings, slow drainage, and reduced cleaning effectiveness.

Every 3-6 months: Clean the inlet screens where supply hoses connect. Hard water areas should clean every 3 months; soft water areas every 6. Also clean the drain pump filter if your model has an accessible one.

Annually: Inspect supply hoses for bulging, cracking, or discoloration. Rubber hoses should be replaced every 5 years regardless of appearance — internal deterioration is invisible until the hose bursts. Upgrade to stainless steel braided hoses for burst protection.

Always: Use the correct amount of HE detergent (if applicable). Check pockets before every load. Do not overload the drum past 3/4 capacity. Leave the door ajar between loads to prevent mold and mildew in the gasket and tub.

F28 code on your Kenmore? Our technicians carry CCU and MCU boards for common 110-series models — connector cleaning or board swap completed in a single visit. Book your repair.