Rain Bird "No Pwr" Error Persists After Transformer Swap

Recurring "No Pwr" Means Controller Failure

If a Rain Bird controller shows "No Pwr" after replacing the transformer (and battery, outlet checked), the main circuit board is likely failing to maintain power regulation or communication.

Why Board Failure Causes This

As the board ages, solder joints crack or components drift, causing intermittent power detection. The controller may work for days, then fail again.

Recommendation

Replace the entire controller. Modern equivalents (Rain Bird ESP-TM2, Hunter Pro-C) offer better reliability, features, and surge protection for $100–$150.

Before Buying

• Count your active zones.
• Note indoor/outdoor mounting needs.
• Check if you need a pump start/master valve output.

Don't waste money on a second transformer—the controller is the root cause.