Speed Queen Washer Error Code Eio 63: 24 Volt Supply Under Voltage
Eio 63 means the input/output board sees its 24 volt supply running too low. The control sounds a pulsing alarm for two minutes, and the manual clears it by disconnecting and reconnecting power. If it comes back, the supply needs testing.
Medium: a low control supply makes the washer unreliable, and the manual describes only an alarm and a power reset.
- Code
- Eio 63
- 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 63 mean?
The washer's control electronics and output circuits depend on a steady 24 volt supply. The input/output board measures it, and when the level sinks below the allowed range it posts Eio 63. The display shows “24 Volt Supply Under Voltage”.
The manual says the control sounds a pulsing alarm tone for two minutes, and that you clear the error by disconnecting and then reconnecting power. No causes are listed. A low supply has several possible origins. The source of the 24 volts may be weak, a short on a valve or contactor output may be pulling it down, or the incoming power may be low. Because a shorted output can drag the supply down, a technician may see Eio 63 together with one of the shorted-output codes, and then the shorted part is the first one to check.
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 63 on the display
- Controls and valves act weakly or reset
Possible causes
Likely causes — what usually sits behind error code Eio 63 on this control. A technician confirms which one it is before any part is replaced.
- 24 volt supply weak or failing
- A shorted valve or contactor output loading the supply down
- Incoming line voltage low at the machine
Safe checks before calling for service
- Note the code and whether any other Eio code appeared at the same time.
- Cycle power as the manual describes.
- If it returns, stop using the machine.
- Tell the technician if lights flicker or other equipment slows when the washer runs.
How a technician diagnoses error code Eio 63
- Confirm the repeat after a power cycle.
- Measure the incoming line voltage under load.
- Measure the 24 volt supply at the board.
- Disconnect outputs one at a time to see whether one is dragging the supply down.
- Replace the supply, the shorted part or the board according to the findings.
- Voltage tests are live measurements inside the electrical area.
- Finding a load that drags the supply down means isolating circuits one by one.
- Low voltage in the building can come from wiring outside the washer.
How error code Eio 63 differs from similar codes
Eio 63 is the low side of the 24 volt supply check. Eio 62 is the high side.
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
Could a shorted valve cause Eio 63?
It can pull the supply down. If a shorted-output code shows too, that part is checked first.
Is it the same as a power outage?
No. The washer still has power but the 24 volt supply is low.
Will cycling power fix it?
It clears the code, but a real supply problem returns.
Need help with Speed Queen error code Eio 63?
A technician confirms the cause on site and gives you the price in writing before any work starts.