Speed Queen Washer Error Code Eio 50: Auxiliary Fill Valve Shorted
Eio 50 means the input/output board found a short on the output for the auxiliary fill valve. A pulsing alarm sounds for two minutes, and the manual clears the error by disconnecting and reconnecting power. A repeat calls for a technician.
Medium: a shorted valve output needs service, and the manual describes only an alarm and a power reset.
- Code
- Eio 50
- 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 50 mean?
An auxiliary fill valve is an extra water inlet that a washer-extractor program can call on in addition to its main hot and cold fill valves. Like the others, it is switched by an output on the input/output board, and the board checks that output for a short. Eio 50 is raised when it finds one, with the display text “Auxiliary Fill Valve Shorted”.
What the manual states is brief. The control sounds a pulsing alarm tone for two minutes, and the error is cleared by disconnecting and then reconnecting power to the machine. No causes are listed, and the manual does not tell what happens to the cycle. Because this valve is used only when a program asks for it, the code may show up on one program and never on another. If it appears every time a certain program reaches its auxiliary fill step, that points toward the valve circuit rather than toward the main fill valves, which have their own codes.
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
- A two-minute pulsing alarm
- Eio 50 on the display
- Extra water not added at the auxiliary fill step
Possible causes
Likely causes — what usually sits behind error code Eio 50 on this control. A technician confirms which one it is before any part is replaced.
- Auxiliary fill valve coil shorted
- Harness to the auxiliary valve chafed against the frame
- Board output driving this valve damaged
Safe checks before calling for service
- Write down Eio 50 and which program was running.
- Disconnect and reconnect power as the manual says.
- Run the same program and note whether the code comes back at the same step.
- Tell the technician if the main hot and cold fills work normally.
How a technician diagnoses error code Eio 50
- Check that the code returns at the same program step after a power cycle.
- Measure the auxiliary valve coil with the power off.
- Check the wiring and connector at the valve.
- Inspect the board output and connector.
- Replace the valve, wiring or board that the readings implicate.
- The valve wiring is routed beside mains-voltage parts inside the cabinet.
- Telling the valve from the harness or the board takes resistance tests.
- Repeated restarts against a short can damage the board.
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 auxiliary fill valve my main fill?
No. The main hot and cold fill valves have their own codes, Eio 45 and Eio 46.
Does the alarm stop by itself?
It sounds for two minutes, according to the manual.
Will the washer still wash?
The manual does not say. Programs that do not use this valve may be unaffected, but ask the technician.
Need help with Speed Queen error code Eio 50?
A technician confirms the cause on site and gives you the price in writing before any work starts.