Nelson SmartZone EZ Error Code 2: Excessive Run Time

Nelson SmartZone EZ “Er2” Error – Total Run Time Exceeds 24 Hours

A Nelson SmartZone EZ controller that worked for years now displays “Er2” and cannot be programmed, though manual/test operation functions. The owner replaced the battery and power‑cycled the unit without success.

Solution

The manual states “Er2” indicates more than 24 hours of total runtime programmed across all programs. Review and reduce run times on all programs, or press Reset and “+” simultaneously to restore factory defaults.