UniMac Washer Error Code Eio 32: Door Lock Relay Pin
Eio 32 on a UniMac QN washer-extractor means the I/O board reported a hardware failure on the door lock solenoid relay pin, so it cannot count on the relay to hold the door shut. The control stops the machine. Switch the washer off, wait for the drum to stop, and call us with the code and model.
High: the lock circuit cannot be trusted, so the machine stops until it is tested.
What does UniMac error code Eio 32 mean?
Eio 32 appears on UniMac QN washer-extractors such as the UCA020QN when the input and output board reports a hardware failure on the door lock solenoid relay pin. That pin switches the relay that powers the lock. The board tests the pin as part of its self-check. When it fails, the board cannot count on the relay to hold the door shut during a cycle, so the control stops the machine instead of running with an uncertain lock. The message comes from the board's hardware test and does not mean the door has opened. The manual lists a failed relay driver on the I/O board that powers the door lock, a loose or corroded lock connector causing an intermittent relay load, and a lock solenoid drawing too much current through the relay.
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 32 on the display and the cycle halts
- Relay click missing or erratic at the door
- Door releases earlier than usual or not at all
- Code returns on each start
Possible causes
Listed in UniMac's documentation
- Failed relay driver on the I/O board that powers the door lock
- Loose or corroded lock connector causing an intermittent relay load
- Lock solenoid drawing too much current through the relay
Other likely causes — what usually sits behind error code Eio 32 on this control. A technician confirms which one it is before any part is replaced.
- Contacts on the relay worn after a very high number of door lock cycles
- Corrosion on the lock plug from steam at the door
- A solenoid coil that has aged and draws more current than it should
Safe checks before calling for service
- Write down Eio 32 and when it showed up.
- Switch the washer off and wait for the drum to stop.
- Leave the cover panels in place.
- Call us and mention the code and model.
- Keep the area clear.
How a technician diagnoses error code Eio 32
- Read the code and confirm whether the lock relay clicks.
- Inspect the lock connector for corrosion and heat marks with power locked out.
- Measure the lock coil resistance and the current it draws when energized.
- Check the board's relay output with a meter.
- Replace the lock or board depending on which test fails.
- The relay switches the lock circuit at line voltage, and testing it means working on an energized board.
- Current measurements on the lock circuit require a clamp meter and the machine's wiring diagram.
- A lock that can release unexpectedly is a hazard until the circuit is proven.
How error code Eio 32 differs from similar codes
Eio 32 is the relay pin that powers the lock. Eio 30 and Eio 34 are the disable pin and its hardware, and Eio 35 covers the lock output hardware.
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
Is it safe to open the door after Eio 32?
Only once the drum has completely stopped; do not force the door.
Can a restart clear Eio 32?
The display may clear, but the check fails again if the relay or lock circuit has failed.
What does the relay do?
It switches power to the lock solenoid so the door stays closed during the cycle.
Need help with UniMac error code Eio 32?
A technician confirms the cause on site and gives you the price in writing before any work starts.