GE Profile UltraFast Combo Error 18: Drain Hose &... | appliancefaults.com

Technical Background:

The MCU (Main Control Unit) monitors the drain pump circuit and water level sensors. error code 18 indicates the MCU has detected an issue with the drain cycle, usually insufficient draining or a drain pump malfunction. The MCU uses voltage feedback from the water level sensor to determine if the water has drained within the specified timeframe. If the voltage remains high (indicating water is still present) after the drain cycle is initiated, error code 18 is triggered.

Symptoms:

The homeowner reports the washer/dryer combo displays an error code 18 and the unit may not be draining properly. Water may be left in the drum after a cycle, or the unit may stop mid-cycle with the error code.

Possible Causes:

Drain hose inserted too far into the standpipe.
Standpipe is too low, causing backflow.
Partial blockage in the drain hose or drain pump.
Siphoning effect due to improper drain hose routing.
Faulty drain pump motor.
Clogged air gap in the drain system.

Solution:

1

Unplug the unit from the 120V AC power outlet and turn off the water supply.
2

Inspect the drain hose connection to the standpipe. Ensure it is not inserted more than 6 inches.
3

Verify the height of the standpipe. It should be at least 30 inches above the floor.
4

Check the drain hose for any kinks, clogs, or obstructions. Remove any blockages using pliers and a small brush.
5

Test the drain pump. Using a multimeter, check for continuity across the pump motor terminals. Typical resistance should be between 5-15 ohms.
6

If the pump fails the continuity test, replace the drain pump assembly. Use a 1/4-inch nut driver to remove the pump mounting screws.
7

Reconnect the drain hose, ensuring proper routing and securing it with clamps. Plug the unit back in and run a test cycle.

Safety Warning:

Always disconnect power to the appliance before performing any repairs. Use proper Lock-Out/Tag-Out (LOTO) procedures. This appliance operates on 120V AC, which can cause serious injury or death. If you are not comfortable working with electricity, contact a qualified appliance repair technician.

Prevention:

Regularly clean the drain pump filter (if accessible) to prevent clogs. Ensure the drain hose is properly installed and not kinked. Check the standpipe height and drain hose insertion depth annually.

Expert Tip:

Enter service mode by pressing and holding the Start/Pause button for 5 seconds. Use the cycle selector knob to navigate to the drain pump test and run the pump to verify its operation. This can help isolate the problem before disassembly.

Frequently Asked Questions

•How do I access the drain pump on this model?

The drain pump is typically accessed from the front of the unit, behind the lower access panel. You'll need to remove the panel using a 1/4-inch nut driver. Be sure to disconnect power and water before attempting to access the pump.

•What is the correct drain hose routing for this combo unit to prevent siphoning?

The drain hose should have a high loop above the top of the washer/dryer combo before descending to the standpipe. This high loop acts as an air break to prevent siphoning. Secure the hose to the cabinet with clamps to maintain the loop.

•What type of drain pump is recommended as a replacement?

Use only the OEM (Original Equipment Manufacturer) drain pump specified for the GE Profile UltraFast Combo. Aftermarket pumps may not provide the correct flow rate or fit properly, potentially causing further issues. Refer to the parts diagram or the unit's service manual for the correct part number.

GE Profile UltraFast Combo Error 18: Drain Hose & Siphoning Repair Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I access the drain pump on this model?

•What is the correct drain hose routing for this combo unit to prevent siphoning?

•What type of drain pump is recommended as a replacement?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: