Kenmore Washer Error Code F/28

F/28Kenmore Washer

What this code means

Serial communication error - communication between the CCU and the MCU cannot be sent correctly.

First step from the service manual

Unplug washer or disconnect power, check wire harness connections to the MCU, motor, and CCU.

Next steps: diagnose the root cause

1
Verify the error code is active

Power cycle the unit and see if the code returns. If it does, the fault is persistent and requires diagnosis.

2
Get the full diagnostic procedure

Get step-by-step guidance, test values, and wiring diagrams from the OEM service manual.

Start diagnosing F/28 on your Kenmore washer

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Related Kenmore washer error codes

CAAverage current limit tripCECommunications errorCIInstantaneous current limit tripCLControl lock is activeCSCall ServicedCDoor is not completely closed; displayed as a reminder to close the door before…dEDoor open errordE2Foreign objects such as coins, pins, clips caught between the wash plate and…dLDoor Lid Lock FailuredUDoor Unlock FailureE11Fill time too long.E13Water leak in tub or air leak in air bell.E14Reed switch fault.E21Water not pumping out fast enough.E22Fill problemE23Fill problemE24Drain pump relay on control board failed.E30Drain problemE31Better modelsE35Better modelsE38Dispenser problemE39Dispenser problemE41Control board thinks the door switch is open.E42Door remains locked after cycle is completed.E43Motor drive internal problem.E44Control board problem.E45Motor drive operation above design limits.E46Control board problem.E47Board thinks the door PTC circuit is open in spin.E48Board thinks the door PTC circuit is closed.E49Motor drive operation above design limits.E4AMotor drive internal problem.E4BMotor drive internal problem.E4CMotor drive internal problem.E4EMotor drive internal problem.E4FMotor drive internal problem.E50Motor drive internal problem.E52Bad signal from tacho generator.E53Motor drive internal problem.E54Motor drive internal problem.E55Motor overheating.E56High motor current.E57Motor drive internal problem.E58Motor drive internal problem.E59No tacho signal for 3 seconds.E5AHigh temperature on heat sink.E5BHigh temperature on heat sink.E5CHigh temperature on heat sink.E5DCommunication problem between control board and speed control board.E5ECommunication problem between control board and speed control board.E5FCommunication problem between control board and speed control board.E60Main control internal problem.E61Main control internal problem.E62System contact failureE63Door lock assembly problem.E64Door lock assembly problem.E65Water level sensor problem.E66Water temperature sensor problem.E67Input voltage on microprocessor incorrect.E70Stuck key detected on control panel.E71Motor drive internal problem.E75Better models onlyE76Better models onlyE95Communication error.EB1Incoming power frequency out of limits.EB2Incoming line voltage above 130 VAC.EB3Incoming line voltage below 90 VAC.EEEEPROM errorEF1Clogged drain pump.EF2Too much soap.EF5Better models onlyErProcessor reset errorF/13Main relays errorF/14Motor Control Unit errorF/21Long drainF/23Heater failureF/24Water temperature sensor (NTC) errorF/25Drive motor tachometer errorF/26Door switch errorF/27Overflow conditionF/29Door unlock errorF01No water detected entering machine or pressure switch trip not detected after…F02Long drainF05Water temperature sensor (NTC) value is out of range during water heating step…F06Drive motor tachometer errorF07Motor Control Unit errorF08Steamer defectF09Overflow conditionF1No water detected entering machine or pressure switch trip not detected…F10Motor Control Unit (MCU) heat sink thermal tripF11Serial communication errorF15MCU thermal trip errorF2Keypad/user interface faultF20No water detected entering machine or pressure switch trip not detectedF22Pump drive system error (alternate code)F30Water temperature increase during the first 40 minutes is less than 86°F (30°C)F31Water temperature sensor (NTC) value is out of range (23°F to 217°F / -5°C to…F32Pressure switch failureF33Unload indication (information only)F34Analog pressure sensor failureF35Motor Control Unit failureF40Steamer communication failureF41Motor RPS Thermistor Open/ShortF42Total steamer failureF43Steamer inlet valve failureF44Steamer time out reachedF5Pump driver fails to activate, one of the main relays is not working properly…F50Motor StalledF51Motor RPS FailureF52Motor rotor position sensor (RPS) faultF53Motor phase current sensing faultF54Motor control over-current faultF6Serial communication errorF60Central Control Unit heartbeat failureF61User Interface heartbeat failureF7Motor speed sensing faultF70Not supportedF72Basket Re-engagement FailureF9Door switch errorFdLDoor lock errorFdUDoor unlock errorFEOverflow error; water level has exceeded the expected level.FHFlip HosesFLOverfill conditionHCHot, Cold ReversedHEHeating errorIEWater inlet erroriPInstall PassLdLong drainLELocked motor errorLFLong filllidLid open conditionLoControl Lock is active; displayed when attempting to wake up a locked unit…LSLid switch errorndWasher experiencing drain problems during cycle; drain pipe may be blocked.nFNo or slow water fill detected during operation.nHNo water detected from install cycle or water supply issue; also indicates cold…nWNo WaterobOff balanceOEWater is not completely drained within 12 minutes; drainage error.OFOverflow erroroLOverloadedOROpen relay failure; the machine controller relay failed in the open position…PEPressure sensor errorPFPower failurePoPump Out (lid opened)PSPressure sensor errorrLCleaning cycle unload indicationSdSuds lockSLSuds lockSrStuck relaySudSuds locktEHeating errortHThermistor error; the water temperature sensor is faulty.UEUnbalance erroruLUnbalanced Load
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