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ErrBase

GE Washer Error 18: Overflow Protection Activated

Quick Answer

Overflow protection triggered - water level inside the drum exceeded the safe maximum. Caused by a stuck pressure sensor, leaking water inlet valve, or siphoning drain hose.

GE washer Error 18 means the overflow protection activated - too much water entered the drum. The most common cause is a faulty pressure sensor that incorrectly reads the water level, or a water inlet valve that leaks and allows water to enter when the machine is off. Also check for siphoning from an improperly installed drain hose.

GeWasherSeverity: highDifficulty: intermediate78% DIY Success
Time to Fix
30–75 min
Difficulty
intermediate
Parts Cost
$15 – $60
Tools Needed
Multimeter, Adjustable pliers

What Does the Error 18 Code Mean?

Overflow protection triggered - water level inside the drum exceeded the safe maximum. Caused by a stuck pressure sensor, leaking water inlet valve, or siphoning drain hose.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

Pressure sensor stuck or sending incorrect readings to control board40%
Water inlet valve solenoid leaking (not closing fully)24%
Drain hose installed too low, causing back-siphoning into drum14%
Control board sending continuous fill signal12%
Air hose connecting tub to pressure sensor clogged or kinked10%

Symptoms You May Notice

  • Error 18 displayed on control panel
  • Water visible above normal drum level
  • Washer pauses mid-fill without completing fill phase
  • Excess water running from the door seal or overflow channel
  • Water accumulating in the drum while machine is off

Can you reset a Ge washer to clear the Error 18 code?

After repairing the inlet valve or pressure sensor, turn off supply valves, unplug the washer for 60 seconds, then restore power and water. Run a short cycle to confirm Error 18 does not return.

Tools Required for Diagnosis

MultimeterAdjustable pliersScrewdriversBucket and towels

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

1

Check the drain hose installation height

Check the drain hose installation height. The end of the drain hose must be 32-96 inches above floor level. If installed too low, water from the standpipe siphons back into the drum, causing false overflow readings.

2

Locate the pressure sensor (water level switch) and trace the

3

Unplug the washer and close the water supply valves

4

Test the pressure sensor with a multimeter

5

After repairing the root cause

Replacement Parts

If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.

Part Name
Water Inlet ValveWH13X10024 · $30–$60
Pressure Sensor / Water Level SwitchWH12X10468 · $15–$35

Repair vs. Replace Calculator

Appliance Age (Years)7 Yrs
Labor Approach
Our Verdict
REPAIR
Estimated Cost: $38 (Parts) vs $900 (New Machine)

Frequently Asked Questions

What causes GE washer Error 18?
Error 18 is triggered when the water level sensor detects more water than the selected cycle allows. The three main hardware causes are a water inlet valve that fails to close (allowing water to leak in continuously), a pressure sensor that reads incorrectly, or a drain hose installed too low which allows water to siphon back into the drum.
Can too much detergent cause GE Error 18?
In some cases, yes. Excessive suds from non-HE detergent or too much HE detergent can interfere with the pressure sensor's ability to read the true water level. The foam can compress the air column in the sensor tube and send a false high-level reading. Always use HE detergent in GE washers and follow the dosage guidelines.
Is GE Error 18 dangerous?
It can be. If the inlet valve is stuck open with the machine in a fault state, water may continue to enter the drum or overflow. If you see water on the floor, immediately close the supply valves before unplugging the machine. After the immediate situation is controlled, diagnose the inlet valve.
How do I test if my GE washer inlet valve is leaking internally?
Close the water supply valves and unplug the washer. Check the drum water level. Wait 15-30 minutes and check the level again. If water has risen with everything off, the inlet valve diaphragm is not sealing. This is a definitive test for a leaking valve.
How is Error 18 different from Error 27 on a GE washer?
Error 18 specifically means an overflow condition - actual or falsely detected excess water. Error 27 means the pressure sensor is out of its expected range or sending a signal the control board cannot interpret. Error 27 can happen with a normal water level, while Error 18 always involves a fill level reading above the threshold.

Related Ge Washer Error Codes

Code: HUBGE Washer Error Codes GuideCode: H2O Supply ErrorGE Washer H2O Supply ErrorCode: RESETHow to Reset a GE Washer

Same Fix Works on These Brands

Ge shares the same hardware platform with these brands. The diagnosis and repair steps are identical.

Ge washerGE Washer Error Codes: Complete GTW and GFW Series Troubleshooting GuideGe washerGE Washer Troubleshooting: 9 Most Common Problems and FixesGe washerHow to Reset a GE Washer: All Models Including Top-Load and Front-LoadGe washerGE Washer Diagnostic Mode: How to Run a Service Test CycleGe washerGE Washer H2O Supply Error: Water Not Entering the MachineGe washerGE Washer Error 353: Drain Pump Failure Fix

Models Known to Experience Error 18 Errors

This repair applies to most Ge washers with this error code. Common model numbers include:

GTW685BSLWS, GTW720BSNWS, GFW850SPNRS, GFW550SSNWW, GFW148SSMWW

Last verified for technical accuracy on March 14, 2026