UniMac Washer Error Code Eio 44: Cold Fill Valve Shorted
Eio 44 on a UniMac QN washer-extractor means the I/O board found the cold fill valve shorted: too much current is flowing through the coil or wiring, so the board turned that output off. Shut the cold water valve at the wall if you can reach it, power the machine down, and call us to check the valve.
High: the cold fill output has been shut off, and the cycle stops until the valve is tested.
What does UniMac error code Eio 44 mean?
Eio 44 on UniMac QN washer-extractors such as the UCA020QN means the input and output board found the cold fill valve shorted. The board feeds each fill valve coil and measures what it draws. When too much current flows through the valve coil or its wiring, the board turns that output off, so a shorted valve does not damage the board. The control then stops the cycle. It is the cold-side partner of Eio 43, and the checks are similar. Both valves are tested. Because the cold valve is used in almost every wash, this code can stop the machine at the first fill. The manual lists the cold fill valve coil resistance, the valve wiring and connector, moisture near the valve, and the I/O board output stage.
Affected models and control systems
Listed for the CHM1792C family of UniMac QN washer-extractors (20-100 lb), with the UCA020QN as the example model, on the input and output (I/O) board.
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
- Eio 44 on the display at the first cold fill
- No water enters the tub, or only hot water does
- Cycle stops almost at once
- Code returns after a restart
Possible causes
Listed in UniMac's documentation
- Cold fill valve coil resistance
- Valve wiring and connector
- Moisture near the valve
- I/O board output stage
Other likely causes — what usually sits behind error code Eio 44 on this control. A technician confirms which one it is before any part is replaced.
- Condensation on a cold inlet valve dripping onto its connector
- A coil damaged by a pressure surge that hammered the valve
- Valve wiring pinched when the rear panel was refitted
Safe checks before calling for service
- Record Eio 44 and shut the cold water supply valve at the wall if you can reach it.
- Power the machine down.
- Wipe up any water on the floor.
- Call us to check the valve.
- Keep the area dry.
How a technician diagnoses error code Eio 44
- Read the code and confirm it appears on a cold fill command.
- With power locked out, measure the cold valve coil resistance against the specification.
- Check the wiring and connector for moisture and damage, and look for condensation on the valve.
- Swap the valve connectors to see whether the code follows the valve.
- Replace the valve if shorted, and the board only if the valve tests good.
- The coil is fed from the board at machine voltage, so the tests are done with the cabinet open and the supply isolated.
- Condensation or a drip that caused the short has to be found, or the new coil will fail the same way.
- Separating a shorted coil from a failed output stage requires a meter and a swap test.
How error code Eio 44 differs from similar codes
Eio 44 is the cold fill valve. Eio 43 is the same check on the hot fill valve.
Technical reference
- Document
- Washer-Extractor Programming CHM1792C_SVG, Part No. F8641001ENR4, Error Codes Table 29 (pp. 100-107)
- Maker documentation
- UniMac owner support
- Edition
- Part No. F8641001ENR4, January 2020
- Models / control
- CHM1792C family washer-extractor (QN models, 20-100 lb) front-end control
- 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 UniMac washer error codes
Can I still wash with hot water only?
Not reliably, since most programs call for cold water as well.
Is Eio 44 the same as E nFLo?
No. E nFLo is too little water flowing. Eio 44 is the board shutting off a shorted valve output.
Do both valves get tested?
Yes. A technician checks both fill valves on the visit.
Need help with UniMac error code Eio 44?
A technician confirms the cause on site and gives you the price in writing before any work starts.