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Error code reference

Daewoo Washer Error Code OF

Water overfill due to faulty water inlet valve or inferior water level sensor.

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Water overfill due to faulty water inlet valve or inferior water level sensor.

First step from the service manual

Change the water inlet valve.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What OF means on a Daewoo washer

The OF error code on a Daewoo washer indicates an overfill condition, meaning the machine has detected that water has risen beyond the intended maximum level inside the drum or tub. This situation arises when the washer cannot properly regulate water intake, either because the component responsible for stopping water flow has failed or because the sensor responsible for detecting water level is providing inaccurate readings to the control board.

The water inlet valve is the primary suspect in most OF error cases. This electromechanical valve controls water entry into the tub and is designed to close completely when the control board signals it to stop. If the valve's internal solenoid fails or its diaphragm becomes worn or debris-laden, it may allow water to continue trickling or flowing into the tub even when it should be closed. This condition is sometimes called a "weeping valve" and will cause overfill during any cycle phase.

The water level sensor, also known as a pressure switch, monitors tub water volume by detecting air pressure changes in a connected pressure hose. If this sensor malfunctions or its readings drift out of calibration, it may fail to signal the control board to shut off the inlet valve at the correct fill level, resulting in continued water entry and an OF fault. A blocked or kinked pressure hose connecting the tub to the sensor can produce the same symptom by giving the sensor a false low-water reading.

Source: manufacturer service documentation.

Common causes of OF

  1. 01

    Faulty water inlet valve

    Part replacement

    A worn or debris-damaged inlet valve solenoid or diaphragm may fail to close fully, allowing water to continue entering the tub. Replacing the valve is the recommended first diagnostic step.

  2. 02

    Defective water level sensor (pressure switch)

    Part replacement

    If the pressure switch fails internally, it may not send the correct stop-fill signal to the control board, causing overfill. Testing the sensor for proper pressure response can confirm this fault.

  3. 03

    Blocked or kinked pressure hose

    Wiring / connection

    The hose connecting the tub to the pressure switch can become kinked, clogged with residue, or disconnected, causing the sensor to read a falsely low water level and allowing overfill.

  4. 04

    Control board failure

    Part replacement

    In less common cases, the main control board may fail to process the water level signal correctly and not cut power to the inlet valve at the appropriate fill point.

See the test procedure for each cause

Frequently asked questions about OF

What does OF mean on a Daewoo washer?
OF stands for overfill on a Daewoo washer, indicating that water has risen above the safe maximum level inside the tub. This error is triggered when the machine cannot properly regulate water intake. The two most likely causes are a water inlet valve that is not closing completely or a water level sensor that is not accurately detecting the water volume in the tub.
How do I fix the OF error on my Daewoo washer?
The recommended first step is to replace the water inlet valve, as a faulty or weeping valve is the most common cause of this error. If replacing the valve does not resolve the issue, inspect the pressure hose connecting the tub to the water level sensor for kinks or blockages, and test the pressure switch itself for proper function. In rare cases, a failed control board may be responsible and would need to be addressed last.
Is it safe to run my Daewoo washer when it shows the OF error?
No, you should not continue running the washer when the OF error is active. An overfill condition can lead to water leaking onto the floor, potential damage to the machine's components, or an electrical hazard if water contacts internal wiring. Unplug the washer and turn off the water supply until the fault is diagnosed and repaired.
Will resetting my Daewoo washer clear the OF error?
A reset may temporarily clear the OF error code, but if the underlying cause is not repaired, the error will return as soon as the washer attempts to fill with water again. A faulty inlet valve or pressure switch will continue to cause overfill on every cycle until the defective part is replaced. Resetting without repairing the root cause is not a lasting solution.
How much does it cost to repair an OF error on a Daewoo washer?
Repair costs depend on which component has failed. A replacement water inlet valve typically costs between $20 and $65 for the part alone, while a water level pressure switch generally ranges from $15 to $50. If you hire a technician, labor charges will add to these part costs. Diagnosing the exact faulty component before purchasing parts can help avoid unnecessary expense.

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