Toro ECx Zone 1 Skips in Auto but Works in Manual—Microprocessor Glitch

Toro ECx 4-zone: Zone 1 skipped in auto (goes straight to Zone 2), but manual run works perfectly. Program correct, wiring good.

Diagnosis

Microprocessor glitch on Zone 1 output. Manual bypass works because it uses different code path.

Solutions

1. Full reset: battery out, power off 1 min, reprogram
2. Move Zone 1 wire to Zone 5 (if available), reprogram
3. If modular: swap Zone 1/2 module to Zone 5/6 slots, reprogram

Module Note

ECx uses plug-in modules. Moving module moves the circuitry.