Hotpoint Washer Error Code 18: Drain Pump Overcurrent... | appliancefaults.com

Technical Background:

Error Code 18 on a Hotpoint washer indicates an overcurrent condition in the drain pump circuit. The MCU monitors the current draw of the drain pump. If the current exceeds a pre-determined threshold for a specific duration, the MCU shuts down the pump and displays the Error Code to protect the pump and the control board. The voltage path flows from the MCU to a relay, then to the drain pump through the wiring harness.

Symptoms:

The homeowner reports that the washer stops mid-cycle and displays Error Code 18. The washer may not drain, or the drain pump may make a humming or buzzing noise.

Possible Causes:

Drain pump blockage (lint, debris, small objects)
Faulty drain pump motor
Wiring harness issue (damaged wires, loose connections)
MCU (Main Control Unit) failure
Drain hose obstruction or kink

Solution:

1

Disconnect power to the washer by unplugging it from the outlet.
2

Locate the drain pump (typically at the bottom rear of the washer) and remove the access panel using a 1/4-inch nut driver.
3

Inspect the drain pump for any visible obstructions. Remove any lint, debris, or small objects.
4

Disconnect the wiring harness from the drain pump. Use a multimeter to check the drain pump motor windings for continuity. A reading of infinity indicates an open circuit, suggesting a faulty pump.
5

Check the voltage supply to the drain pump when the washer is attempting to drain. You should measure approximately 120V AC using a multimeter. No voltage indicates a wiring or control board issue.
6

Inspect the wiring harness for any signs of damage, such as frayed wires or loose connections. Repair or replace as needed.
7

If all other components test good, the MCU may be faulty. Replacement of the MCU may be necessary.

Safety Warning:

Always disconnect power to the appliance before performing any repairs. High voltage is present within the appliance, and contact can result in serious injury or death. Use proper Lock Out Tag Out (LOTO) procedures.

Prevention:

Regularly clean the lint filter and inspect the drain hose for kinks or obstructions. Avoid washing items that may shed excessive lint or small objects that could clog the drain pump.

Expert Tip:

To enter service mode on some Hotpoint washers, press and hold the Start/Pause and Soil Level buttons simultaneously for 3 seconds. This will allow you to run diagnostic tests on individual components, including the drain pump.

Frequently Asked Questions

•What is the resistance range I should expect on a good drain pump?

Typically, a good drain pump motor will have a resistance between 5 and 20 ohms. Consult the service manual for your specific model for precise values.

•How do I check the drain hose for obstructions?

Disconnect the drain hose from both the washer and the drainpipe. Visually inspect the hose for any kinks or blockages. You can also use a garden hose to flush out any debris.

•Where can I find the service manual for my Hotpoint washer model?

You can often find service manuals online through appliance parts retailers or manufacturer websites. Search using your specific model number.

Hotpoint Washer Error Code 18: Drain Pump Overcurrent Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the resistance range I should expect on a good drain pump?

•How do I check the drain hose for obstructions?

•Where can I find the service manual for my Hotpoint washer model?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: