GE dishwasher — Error Code C1

The control board has identified that the unit is not draining within the allotted timeframe.

What it means

The C1 error code on your GE dishwasher points to a drain timeout issue. When the drain cycle begins, the main control board activates the drain pump and checks the water level using the float switch or pressure sensor. If the water doesn't reach an empty status within the set interval—usually between 90 and 120 seconds—the board halts the process and displays the C1 code. This safety feature protects the wash pump from running without water and prevents potential flooding. The issue usually stems from a physical obstruction in the plumbing, a faulty drain pump motor, or a sensor that is incorrectly reporting water levels.

Likely Causes

1

Clogged Drain Hose or Air Gap

Any obstruction in the corrugated drain line, the sink air gap, or the connection to your garbage disposal will impede water flow and cause the tub to drain too slowly.
2

Blocked Pump Filter or Sump

Small items like broken glass, food scraps, or labels can bypass the coarse filter, jamming the drain pump impeller and significantly hindering its ability to move water.
3

Failed Drain Pump

The drain pump motor windings may have an open circuit, or the impeller could have detached from the motor shaft. In either scenario, even with 120V supplied, the pump cannot effectively evacuate water.
4

Faulty Pressure Sensor or Float Switch

If the sensor is stuck or suffers an electrical failure, it may falsely notify the control board that water remains in the tub even when it is actually empty, leading to a timeout.
5

Main Control Board Failure

In rare instances, the drain relay on the main control board may fail, preventing the board from delivering the necessary 120V to the drain pump when required.

How to clear / reset

To attempt to clear the C1 error, press the Start/Reset button to stop the current cycle. Allow 2 minutes for the dishwasher to try a forced drain. Should the code remain, perform a hard reset by flipping the circuit breaker off for 5 minutes. Power the unit back on and attempt a short rinse cycle. Please be aware that if a physical blockage exists or standing water remains, the C1 code will reappear during the next drain attempt; the physical drainage issue must be corrected to clear the error permanently.

Common replacement parts

Drain Pump Assembly $45-90

Drain Hose $15-35

Pressure Sensor / Flood Switch $30-60

Main Control Board $120-250 $120-250

When to call a pro

If you have cleaned the filters and checked the air gap but the C1 code persists, it is time to contact a professional. Diagnosing a bad drain pump requires a multimeter to verify 120V output from the control board and test the motor windings for continuity. Tasks involving main control board replacement or accessing the pump assembly under the tub are best handled by our technicians. A-Fix Service provides a $90 diagnostic fee (waived if you proceed with the repair) and includes a 1-year parts and labor warranty on all completed work.

FAQs

What is the typical cost to resolve a C1 error on a GE dishwasher?

For minor clogs, you will likely only pay the $90 diagnostic fee. If the drain pump requires replacement, you can expect total costs between $150 and $250, covering both parts and labor.

Is the C1 code something I can troubleshoot myself?

Yes, you can check the simple areas first: clean the bottom filter, inspect the sink air gap, and confirm the disposal knockout plug was removed if the unit was recently installed. For electrical or internal pump issues, we recommend professional assistance.

Will the C1 error disappear automatically once the water drains?

No, the control board stores the timeout error in its memory. You must manually clear the active error by pressing Start/Reset or power cycling the unit before starting a new cycle.

How long does a technician usually take to fix this?

Most drainage problems, including clearing stubborn clogs or replacing the pump, are finished in about 45 to 60 minutes once the technician arrives.

Is it safe to continue using the dishwasher while the C1 code is present?

The dishwasher will generally refuse to complete a cycle until the drainage problem is solved. Running the unit repeatedly with a failing pump risks running the wash motor dry and can cause standing water to become unsanitary or lead to leaks.

Need help with C1?

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