GE Dishwasher 1H/IH Display Error: Troubleshooting Guide... | appliancefaults.com

Technical Background:

The dishwasher's Main Control Unit (MCU) monitors the drain cycle. error code 1H/IH typically indicates that the MCU is not detecting proper drainage within a specified timeframe. This can be due to a blockage in the drain path, a malfunctioning drain pump, or an issue with the MCU itself. Voltage readings on the drain pump circuit should read 120V AC during the drain cycle.

Symptoms:

The GE dishwasher displays an error code of either "1H" or "IH" on the control panel. The dishwasher may not drain properly, leaving standing water at the end of the cycle. The wash cycle may be interrupted.

Possible Causes:

Blocked drain line
Clogged air gap
Defective drain pump
Faulty control board
Obstruction in the impeller

Solution:

1

Disconnect power to the dishwasher at the breaker panel. Verify 0V AC at the dishwasher's power cord connection with a multimeter.
2

Inspect the drain hose for kinks or obstructions. Disconnect it from the garbage disposal or sink drain and check for clogs.
3

Clean the air gap (if equipped) by removing the cover and clearing any debris with a small brush or wire.
4

Access the drain pump (usually at the bottom of the dishwasher). Check for obstructions such as food particles or broken glass. Remove any debris.
5

Test the drain pump for continuity with a multimeter. A lack of continuity indicates a failed pump.
6

If the drain pump tests good, inspect the control board for signs of damage, such as burned components. Replace the control board if damage is evident. A 1/4-inch nut driver is needed for control board access.
7

After repairs, restore power and run a test cycle to confirm the error code is resolved.

Safety Warning:

Always disconnect power to the dishwasher before performing any repairs. Use Lock-Out Tag-Out (LOTO) procedures to prevent accidental re-energizing of the circuit. High voltage is present when the dishwasher is powered on.

Prevention:

Regularly clean the dishwasher filter to prevent food particles from entering the drain system. Run a dishwasher cleaner cycle monthly to remove buildup. Ensure the air gap (if present) is free of debris.

Expert Tip:

To enter service mode on some GE dishwashers, press and hold the Start button for 5 seconds, then press the Cycle Select button three times in quick succession. This allows you to run diagnostic tests and clear error codes.

Frequently Asked Questions

•What is the resistance range I should expect when testing the drain pump?

Typically, a good drain pump will read between 10 and 30 ohms. An open circuit (OL) indicates a faulty pump.

•Where is the dishwasher's drain pump located and how do I access it?

The drain pump is usually located at the bottom of the dishwasher, often behind a lower access panel. You may need to remove the lower spray arm and filter to access it. Check your specific model's service manual for detailed instructions.

•If the drain pump runs but the dishwasher still doesn't drain, what else could be the problem?

Even if the drain pump runs, the impeller inside could be damaged or obstructed. Also, check for a clog in the drain hose where it connects to the garbage disposal or sink drain. Finally, a partially blocked air gap can restrict drainage even if the pump is working.

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the resistance range I should expect when testing the drain pump?

•Where is the dishwasher's drain pump located and how do I access it?

•If the drain pump runs but the dishwasher still doesn't drain, what else could be the problem?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: