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Error code reference

Speed Queen Washer Error Code Er, OF

Overflow error displayed when the Start/Pause button is not pressed within five minutes after the OF, St code…

Speed Queen codesSpeed Queen washer codes

Overflow error displayed when the Start/Pause button is not pressed within five minutes after the OF, St code appears.

First step from the service manual

Unplug the machine 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 Er, OF means on a Speed Queen washer

The Er, OF code on a Speed Queen washer indicates an overflow error condition that was not acknowledged by the user in time. Specifically, this error appears when the machine detects an overflow situation and displays an interim alert code (OF, St) prompting the operator to press the Start/Pause button. If that button is not pressed within five minutes of the OF, St code appearing, the machine escalates the alert to the Er, OF fault code. This sequence suggests the washer's water level sensing system detected water rising above the intended fill level and attempted to alert the user before logging a full fault.

The overflow detection system relies on a pressure switch (also called a water level sensor) to monitor the volume of water in the drum. If the pressure switch signals that water has exceeded the safe fill threshold, the control board initiates the warning sequence. Root causes can include a faulty water inlet valve that fails to close properly, a defective pressure switch providing inaccurate water level readings, or a slow drain condition where water backs up and raises the drum level. In some cases, using excess detergent can generate excessive suds that artificially trigger the pressure switch.

Because the Er, OF code can result from both a missed user prompt and an actual hardware fault, the first step is always a power reset. Unplugging the machine for 15 seconds clears the stored error and allows the control board to reinitialize. If the code returns after the reset without any user delay in pressing Start/Pause, the underlying water level or inlet valve system should be inspected more thoroughly.

Source: manufacturer service documentation.

Common causes of Er, OF

  1. 01

    User did not press Start/Pause in time

    Wiring / connection

    The most straightforward cause is simply that the OF, St prompt appeared while the machine was unattended and no one pressed Start/Pause within the five-minute window. This is a non-hardware cause that typically clears with a power reset.

  2. 02

    Faulty water inlet valve

    Part replacement

    A water inlet valve that does not close fully can allow water to continuously enter the drum, triggering the overflow sensor. Check whether water continues to trickle into the drum when the machine is idle.

  3. 03

    Defective pressure switch

    Part replacement

    The pressure switch monitors water level inside the tub. If the switch is faulty or its sensing hose is kinked or clogged, it may send incorrect signals to the control board indicating an overflow when the water level is actually normal.

  4. 04

    Slow or clogged drain

    Wiring / connection

    If the drain hose or pump filter is partially blocked, water cannot exit the tub fast enough, causing levels to rise and trip the overflow sensor. Inspect the drain hose for kinks and clean the pump filter if accessible.

  5. 05

    Excessive detergent or suds

    Wiring / connection

    Using too much detergent or a non-HE detergent in an HE washer creates heavy suds that can fool the pressure switch into reading a high water level. Switch to the correct detergent type and use the recommended amount.

See the test procedure for each cause

Frequently asked questions about Er, OF

What does Er, OF mean on a Speed Queen washer?
Er, OF is an overflow error code on a Speed Queen washer. It appears when the machine previously displayed an OF, St warning code prompting the user to press Start/Pause, but that button was not pressed within five minutes. The code indicates the washer detected or anticipated an overflow condition and shut down after the response window expired. A 15-second power reset is the recommended first step to clear it.
Will unplugging my Speed Queen washer reset the Er, OF code?
Yes, unplugging the machine for at least 15 seconds allows the control board to reset and clears the stored Er, OF fault. After restoring power, the washer should be ready to operate. However, if the code returns on the next cycle without a missed button prompt, a component issue such as a faulty inlet valve or pressure switch is likely the cause and should be investigated.
Is it safe to keep using my washer after the Er, OF code appears?
You should not continue running the washer until the cause of the overflow condition is understood. If the code was triggered simply because Start/Pause was not pressed in time, resuming use after a reset is generally safe. If an actual overflow occurred, water may have reached components or the floor, and the inlet valve or pressure switch should be inspected before running another cycle to avoid water damage.
How much does it cost to repair a Speed Queen washer showing Er, OF?
Repair costs depend on the root cause. If the issue is only the missed Start/Pause prompt, there is no repair cost beyond your time. Replacing a faulty water inlet valve typically runs between $50 and $150 for the part, with labor adding $75 to $200 if a technician is hired. A pressure switch replacement is generally less expensive, with parts ranging from $20 to $60 plus labor.
What should I check if the Er, OF code keeps coming back after resetting?
If the Er, OF code returns repeatedly, focus on the water inlet valve, the pressure switch, and the drain system. Verify the inlet valve fully closes when the machine is not filling, check the pressure switch sensing hose for kinks or blockages, and inspect the drain hose and pump filter for obstructions. Also confirm you are using the correct type and amount of detergent, as excess suds can trigger the overflow sensor.

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