GE Dishwasher Error Code C1: Air Gap Cleaning Guide -... | appliancefaults.com

Technical Background:

The dishwasher's main control unit (MCU) monitors the drain cycle using a timer and a pressure sensor. If the water level does not decrease within a specific timeframe, the MCU interprets this as a drain failure and triggers the C1 error. Voltage paths related to the drain pump, pressure sensor, and the control board itself are critical to verify during troubleshooting.

Symptoms:

The dishwasher starts a cycle but does not drain properly. The C1 error code appears on the display panel. The dishwasher may fill with water, but the water remains after the wash cycle completes. Homeowner reports seeing standing water.

Possible Causes:

Clogged air gap
Blocked drain hose
Faulty drain pump
Restricted garbage disposal connection (if applicable)
Defective pressure sensor
Control board failure

Solution:

1

Disconnect power to the dishwasher at the breaker panel.
2

Inspect and clean the air gap. Remove the air gap cover and clear any debris with a small brush or wire.
3

Detach the drain hose from the dishwasher and the drain connection (garbage disposal or sink drain). Check for kinks and obstructions. Flush with water to dislodge any debris.
4

Test the drain pump. Use a multimeter to check for continuity. If no continuity, replace the pump. If continuity is present, apply 120V AC to the pump terminals (after reconnecting power temporarily and CAREFULLY) to see if the pump activates.
5

Inspect the pressure sensor and its hose for blockages. The pressure sensor detects water levels in the dishwasher.
6

Reassemble the drain components and restore power to the dishwasher.
7

Run a test cycle to verify the C1 error is resolved.

Safety Warning:

Disconnect power at the breaker panel before working on any electrical components. Lock Out/Tag Out (LOTO) procedures should be followed. Dishwashers operate on 120V AC, which can cause severe electrical shock.

Prevention:

Regularly clean the air gap (every 3-6 months). Avoid overloading the dishwasher with excessive food debris. Ensure the garbage disposal is clear of obstructions. Use a dishwasher cleaner monthly to prevent buildup.

Expert Tip:

Many GE dishwashers have a service mode that allows for specific component testing, including the drain pump. To access this mode, press and hold the Start/Reset button for 5 seconds, then press the following sequence: High Temp - Heated Dry - High Temp - Heated Dry. Consult the service manual for specific test procedures.

Frequently Asked Questions

•How do I properly test the drain pump with a multimeter?

Disconnect the drain pump from the wiring harness. Set your multimeter to the ohms setting. Place the probes on the pump terminals. A reading between 10-30 ohms typically indicates a good pump. No reading (OL) indicates an open circuit and a faulty pump. A very low reading suggests a shorted pump.

•Where is the air gap located on my GE dishwasher?

The air gap is usually located near the sink, on the countertop. It's a small, chrome-colored cap. Some dishwashers might not have a visible air gap, in that case, the drain hose connects directly to the sink drain or garbage disposal.

•If the drain pump tests good, what else could be causing the C1 error?

If the drain pump is functioning correctly, the issue could be a blockage further down the drain line, a faulty pressure sensor that is not properly detecting water level, or a malfunctioning control board failing to send the signal to activate the drain pump or misinterpreting the water level information.

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I properly test the drain pump with a multimeter?

•Where is the air gap located on my GE dishwasher?

•If the drain pump tests good, what else could be causing the C1 error?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: