Toro TMC-212 Odd/Even Watering Fails: Microprocessor Failure or Day Exclusion Error

Symptoms: Odd/Even Settings Don't Work, Manual Start Works

An 8-year-old Toro TMC-212 reluctantly runs on odd/even days; switching between them sometimes "fixes" it. Now it won't run on either setting. Date/time are correct. Manual start works.

Troubleshooting Steps

1. Check Day Exclusion feature: Ensure no days are accidentally excluded (all days blocked).
2. Use Interval mode instead: Set interval to 2 days (runs every other day) — bypasses odd/even logic.
3. Try Program B or C: Move schedule to another program; if odd/even works there, Program A is corrupted.

Root Cause: Microprocessor Degradation

If the above fail, the microprocessor is failing. This controller cannot be repaired. Replace with:

• Irritrol Rain Dial — repairable, durable, easy programming.
• Rain Bird ESP series — equally reliable.

Why Replace?

Toro modular controllers of this era have non-replaceable boards. New controllers offer better surge protection, battery backup, and features like seasonal adjust.