Speed Queen Washer Error Code Eio 55: Drive Contactor Coil Shorted
Eio 55 means the input/output board found a short on the output that drives the drive power contactor coil. The control sounds a pulsing alarm for two minutes, and the manual clears it by cycling power. Do not keep restarting the washer; call for service if it returns.
High: the shorted output belongs to the drive power contactor, so the washer should stay off until it is tested.
- Code
- Eio 55
- Maker
- Speed Queen
- Equipment
- Washers
- Applies to
- Alliance/Speed Queen CHM1792C_SVG washer-extractor (model numbers on p. 8)
What does Speed Queen error code Eio 55 mean?
The drive power contactor is a heavy-duty switch that connects power to the washer's drive. The input/output board energizes its coil through one of its outputs and checks that output. When the output looks shorted, the board reports Eio 55 and the display shows “Drive Power Contactor Coil Shorted”.
The manual explains that the control sounds a pulsing alarm tone for two minutes, and that the error is cleared by disconnecting and then reconnecting power. No causes are listed. This code is more serious in nature than a small valve short because the output belongs to a power contactor. The drive depends on that contactor, so the machine may not be able to turn the drum properly while the problem exists, although the manual does not say so. A technician should test the coil and its wiring before anyone repeatedly cycles power to see whether the code stays away.
Affected models and control systems
Alliance/Speed Queen washer-extractors covered by programming manual CHM1792C_SVG; the model numbers are listed on page 8 of that manual.
Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.
What you may notice
- Pulsing alarm for two minutes
- Eio 55 on the display
- The drum does not turn or the cycle will not start
Possible causes
Likely causes — what usually sits behind error code Eio 55 on this control. A technician confirms which one it is before any part is replaced.
- Contactor coil with shorted turns
- Coil wires crushed or chafed near the contactor
- Output on the board damaged by the short
Safe checks before calling for service
- Note the code and whether the drum was turning when it began.
- Cycle power once, as the manual says. Do not restart over and over.
- If the code returns, stop using the washer.
- Tell the technician if the machine has had electrical work, a flood or a power surge recently.
How a technician diagnoses error code Eio 55
- Verify that the code repeats after a single power cycle.
- With power off and locked out, measure the contactor coil resistance.
- Inspect coil wiring and terminals for heat marks or chafing.
- Check the board output and its connector.
- Replace the coil or contactor, harness or board according to the measurements.
- The contactor handles motor power, so the cabinet interior holds live high-current wiring.
- Locking out power and measuring a coil is routine for a technician and unsafe for others.
- Repeated restarts on a shorted coil output can burn the board.
How error code Eio 55 differs from similar codes
Eio 55 is a contactor coil short for the drive. Eio 56 is the same kind of short for the electric heat contactor.
Technical reference
- Document
- Washer-Extractor Programming CHM1792C_SVG (Original Instructions)
- Edition
- Part No. F8641001ENR4, January 2020
- Models / control
- Alliance/Speed Queen CHM1792C_SVG washer-extractor (model numbers on p. 8)
- Section
- Error Codes, Table 29, pp. 100-108 (PDF pages equal printed pages)
- Checked
- October 2026
We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.
Related Speed Queen washer error codes
Is the drum dangerous with Eio 55?
The manual does not say. Because the drive is involved, leave the washer off until it is checked.
Can I reset it several times?
One power cycle is what the manual describes. If it returns, stop and call.
What is a contactor coil?
It is the electromagnet that closes the contactor's power contacts. The code says its control output looks shorted.
Need help with Speed Queen error code Eio 55?
A technician confirms the cause on site and gives you the price in writing before any work starts.