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Error code reference

Speed Queen Washer Error Code OF, St

The washtub has filled to the overflow level.

Speed Queen codesSpeed Queen washer codes

The washtub has filled to the overflow level.

First step from the service manual

Press Start/Pause button; the machine will begin to spin to attempt to pump water out. If Start/Pause is not pressed within five minutes, Er, OF will be displayed and the machine will need to be unplugged for 15 seconds to clear the code.

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

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What OF, St means on a Speed Queen washer

The OF, St error code on a Speed Queen washer indicates that the washtub has filled with water to the overflow level. This is a critical overfill condition where the water level sensor or pressure switch has detected water rising above the normal maximum fill threshold. The washer halts normal cycle operation and enters a protective state to prevent water from spilling onto the floor or causing damage to internal components.

When this code appears, the machine is designed to give the operator a chance to intervene. Pressing the Start/Pause button triggers a spin cycle intended to activate the drain pump and remove the excess water from the tub. This is the primary recovery mechanism built into the control logic. If the operator does not press Start/Pause within five minutes of the code appearing, the error escalates to Er, OF, which is a locked fault state requiring the machine to be unplugged for at least 15 seconds before normal operation can resume.

Common causes of an overfill condition include a faulty water inlet valve that fails to close completely, a defective water level pressure switch that misreads the fill level, or a control board fault that fails to stop the fill cycle at the correct time. In some cases, household water pressure that is unusually high can overwhelm a weakened inlet valve and contribute to overfilling. Identifying the root cause is essential, since simply clearing the code without addressing the underlying component failure will result in the error recurring.

Source: manufacturer service documentation.

Common causes of OF, St

  1. 01

    Faulty water inlet valve

    Part replacement

    A water inlet valve that does not fully close when signaled by the control board allows water to continue entering the tub even after the fill cycle ends. This is the most frequent cause of overfill conditions and the valve typically needs to be replaced.

  2. 02

    Defective water level pressure switch

    Part replacement

    The pressure switch monitors water level by sensing air pressure in a small chamber connected to the tub. If the switch is faulty or the pressure hose is cracked or clogged, it may fail to signal the control board to stop filling at the correct level.

  3. 03

    Clogged or kinked pressure switch hose

    Wiring / connection

    The small hose connecting the tub to the pressure switch can become blocked with debris or kinked, preventing accurate water level readings. Inspecting and clearing or replacing this hose may resolve the issue without replacing the switch itself.

  4. 04

    Control board malfunction

    Part replacement

    If the main control board fails to send the shutoff signal to the inlet valve at the correct water level, overfilling can occur even when the inlet valve and pressure switch are functioning correctly. This is less common but should be considered after ruling out other components.

  5. 05

    Excessively high household water pressure

    Wiring / connection

    Very high incoming water pressure can force water past a partially worn inlet valve solenoid, contributing to overfill events. Checking household pressure and installing a pressure regulator may be necessary in addition to replacing the inlet valve.

See the test procedure for each cause

Frequently asked questions about OF, St

What does OF, St mean on a Speed Queen washer?
OF, St means the washtub has filled with water up to the overflow level, triggering a protective stop in the wash cycle. The machine detects this condition through its water level sensing system and halts operation to prevent flooding. Pressing the Start/Pause button within five minutes will initiate a spin to pump out the excess water. If that window is missed, the code escalates to Er, OF and the machine must be unplugged for 15 seconds to reset.
How do I fix the OF, St error on my Speed Queen washer?
Start by pressing the Start/Pause button to trigger a spin and drain the excess water. Once the tub is clear, inspect the water inlet valve for signs of failure, check the pressure switch hose for kinks or blockages, and test the water level pressure switch. If the inlet valve is not closing fully, replacing it is typically the most direct fix for a recurring overfill condition.
Will unplugging my Speed Queen washer clear the OF, St error?
Unplugging the machine for 15 seconds is required only if the error escalates to Er, OF, which happens when Start/Pause is not pressed within five minutes of OF, St appearing. Simply clearing the code will not fix the underlying cause of the overfill, so the error is likely to return if the faulty component is not repaired or replaced.
Is it safe to use my Speed Queen washer when the OF, St code appears?
You should not run a new wash cycle until the cause of the overfill has been identified and corrected. An overfill condition can result in water spilling onto the floor, which creates a slip hazard and potential water damage to flooring and nearby structures. The machine's built-in recovery step, pressing Start/Pause to spin out the water, is safe to use, but continuing to operate the washer without addressing the root cause is not recommended.
How much does it cost to repair a Speed Queen washer showing an OF, St error?
Repair costs depend on which component has failed. A replacement water inlet valve typically runs in the range of $25 to $75 for the part, while a water level pressure switch generally costs between $15 and $50. If professional labor is involved, total repair costs including diagnosis and parts can range from $100 to $250 or more depending on your location and the specific component requiring replacement.

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