GE Profile UltraFast Combo: Troubleshooting "End"... | appliancefaults.com

Technical Background:

The MCU (Main Control Unit) monitors various sensors and components to determine the completion of a wash or dry cycle. Voltage paths from the door lock switch, thermistor, pressure sensor, and drain pump provide feedback to the MCU. A fault in any of these circuits can cause the MCU to incorrectly believe the cycle is still in progress, resulting in the persistent "End" message.

Symptoms:

The "End" message remains illuminated on the GE Profile UltraFast Combo washer-dryer display for an extended period, typically an hour or more, after the cycle has completed. The door may or may not unlock.

Possible Causes:

Faulty door lock/latch switch assembly.
Main Control Unit (MCU) failure or corrupted software.
Moisture or corrosion on wiring harness connectors.
Blocked drain pump or drain hose.
Thermistor malfunction causing false temperature readings.
Pressure sensor malfunction.

Solution:

1

Disconnect power to the unit at the breaker panel. Verify zero voltage at the wall receptacle using a multimeter.
2

Inspect the door lock/latch assembly. Check for physical damage and ensure it's properly aligned. Measure the resistance across the door switch terminals with the door closed. It should read near zero ohms. If not, replace the door lock/latch assembly.
3

Check the drain pump and drain hose for obstructions. Remove the lower access panel and disconnect the drain hose. Inspect for clogs. Verify the drain pump impeller spins freely. Use a multimeter to test the drain pump windings for continuity (typically around 15-25 ohms).
4

Inspect wiring harnesses and connectors, especially those connected to the MCU, door lock, drain pump, and thermistor. Look for signs of corrosion or damage. Clean connectors with electrical contact cleaner.
5

Access the MCU (usually located behind the control panel). Visually inspect the board for burnt components or damage. If you suspect a software issue, try to locate a service flash drive to re-flash the MCU. Consider replacing the MCU if damage is evident or if re-flashing doesn't resolve the issue.
6

Test the thermistor using a multimeter. Consult the service manual for the correct resistance value at room temperature (typically around 10,000 ohms at 77°F). Replace if out of spec.
7

Reassemble the unit and reconnect power. Run a test cycle to verify the issue is resolved.

Safety Warning:

Always disconnect power to the appliance at the breaker panel before performing any diagnostic or repair procedures. Use Lock-Out/Tag-Out (LOTO) procedures to prevent accidental re-energizing of the circuit. This appliance operates on 120V AC, which can cause serious injury or death.

Prevention:

Regularly clean the lint filter after each drying cycle. Use appropriate HE detergent in the correct amount. Periodically inspect and clean the drain pump filter (if accessible) to prevent clogs. Check the drain hose for kinks or obstructions.

Expert Tip:

Some GE appliances have a service mode that allows you to run diagnostic tests and view error codes. To enter service mode on this unit, try pressing and holding the Start/Pause and Signal buttons simultaneously for 3 seconds. Refer to the service manual for specific instructions and test procedures.

Frequently Asked Questions

•Where is the thermistor located in the GE Profile UltraFast Combo?

The thermistor is typically located near the heating element in the dryer section or within the water inlet valve assembly for the washer. Consult the service manual for the exact location for your model.

•How do I re-flash the MCU if I suspect a software issue?

Re-flashing the MCU requires a GE service flash drive and specific software. This process is best left to a qualified technician, as incorrect flashing can permanently damage the MCU. Contact a GE authorized service provider.

•What is the typical lifespan of the door lock/latch assembly?

The lifespan of the door lock/latch assembly varies depending on usage frequency, but it typically lasts between 3 to 7 years. Signs of wear and tear include difficulty opening or closing the door, or the "End" message persisting even when the door is properly closed.

GE Profile UltraFast Combo: Troubleshooting "End" Message Stays On

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•Where is the thermistor located in the GE Profile UltraFast Combo?

•How do I re-flash the MCU if I suspect a software issue?

•What is the typical lifespan of the door lock/latch assembly?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: