How to Fix Maytag Dryer Error d12

Error Code: Dryer Difficulty: Moderate

Problem: Diagnostic code: Motor sensor circuit failure—failed tachometer or Hall effect sensor

How to Fix Dryer Error

1. Enter diagnostic mode and run motor speed test—observe if RPM reading displays correctly or shows error.
2. Unplug dryer and remove rear panel to access motor WPW
3. Locate tachometer/Hall sensor mounted on motor end bell (typically 2-3 wire harness).
4. Disconnect sensor harness and inspect for damage or corrosion.
5. Test sensor output per manufacturer specifications (typically requires oscilloscope to verify pulse signal while manually rotating motor shaft).
6. If sensor output absent or erratic, motor assembly must be replaced—sensor is integrated into motor housing and not serviceable separately.
7. Remove motor mounting bolts and belt tensioner to extract motor assembly.
8. Transfer blower wheel to new motor WPW10438706 if not included—ensure setscrew tightens securely on shaft flat.
9. Reinstall motor with proper belt tension (idler pulley should deflect 1/2-3/4 inch when pressed).
10. Exit diagnostic mode and run test cycle—verify motor reaches proper RPM and maintains speed under load.