Roper Dishwasher Not Draining: Troubleshooting Guide -... | appliancefaults.com

Technical Background:

The dishwasher's main control unit (MCU) initiates the drain cycle after the wash cycle completes. The MCU sends a 120V AC signal to the drain pump motor. If the motor is functional and the drain path is clear, the water is pumped out through the drain hose. Blockages, pump failures, or control board issues can interrupt this process.

Symptoms:

The homeowner reports that the Roper dishwasher is not draining after a wash cycle, leaving standing water in the bottom of the appliance.

Possible Causes:

Clogged drain hose
Blocked drain pump
Faulty drain pump motor
Clogged air gap (if equipped)
Defective drain valve or solenoid
Control board malfunction

Solution:

1

Disconnect power to the dishwasher at the breaker panel. Turn off the corresponding breaker and verify with a non-contact voltage tester.
2

Inspect the drain hose for kinks or obstructions. Remove the hose from the drain connection under the sink and check for blockages.
3

Locate the drain pump, usually at the bottom of the dishwasher. Access it by removing the lower access panel. Remove any debris from the pump inlet. Sometimes a small object like glass shards can jam the impeller.
4

Using a multimeter, check the drain pump motor for continuity. A reading of OL (open loop) indicates a faulty motor. Check winding resistance; typical values are between 10-50 ohms.
5

Verify the drain pump is receiving 120V AC during the drain cycle. Use a multimeter to test the voltage at the pump terminals during the drain cycle. Initiate a drain cycle through the dishwasher's controls.
6

If the pump is receiving voltage but not running, replace the drain pump.
7

If the pump is not receiving voltage, inspect the control board for any signs of damage or burned components. Check for loose wiring connections as well.

Safety Warning:

Always disconnect power to the dishwasher before performing any repairs. Lock out and tag out (LOTO) the breaker to prevent accidental re-energization. Be aware of potential electrical hazards when working with 120V AC circuits.

Prevention:

Regularly run a dishwasher cleaner cycle with vinegar or a commercial dishwasher cleaner to prevent buildup of grease and food particles. Inspect and clean the drain hose and air gap (if equipped) every 6 months.

Expert Tip:

Many dishwashers have a diagnostic mode. Consult the service manual or manufacturer's website for the specific sequence to enter the diagnostic mode. This can provide valuable error codes and test the drain pump functionality directly.

Frequently Asked Questions

•How do I access the drain pump on my Roper dishwasher?

Typically, you need to remove the lower access panel. You may need a 1/4-inch nut driver or a Phillips head screwdriver. Refer to your dishwasher's service manual for exact instructions.

•What is the typical lifespan of a dishwasher drain pump?

A dishwasher drain pump typically lasts between 5-10 years, depending on usage and water quality. Hard water can shorten the lifespan.

•Where can I find a replacement drain pump for my Roper dishwasher?

You can find replacement parts at appliance parts retailers online or at local appliance repair shops. Have your dishwasher model number handy when ordering.

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I access the drain pump on my Roper dishwasher?

•What is the typical lifespan of a dishwasher drain pump?

•Where can I find a replacement drain pump for my Roper dishwasher?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: