This document provides a reference guide for common Alliance Laundry Systems machines error codes (including Speed Queen, UniMac, and Huebsch). It includes code meanings and recommended troubleshooting steps.
Diagnostic Mode Codes (Manual Mode)
Alliance machines feature Manual Mode for testing components and viewing real-time system values. Some key diagnostic codes include:
- d19 – Shows cylinder temp; displays SH or oP if thermistor error.
- d20–d40 – Used for testing switches, voltage, fans, and airflow.
Best Practices
- Always power down the machine for at least 3 minutes before restarting to clear fatal errors.
- Regularly inspect door lock, valves, pumps, and sensors.
- Use diagnostics to identify issues before replacing major components.