Rain Bird SST Controller Dead After Electrical Storm: Transformer or Controller?

Diagnosing a Rain Bird SST4 Zone System After Lightning

Following an electrical storm, a Rain Bird SST 4‑zone controller shows no display. The user suspects the transformer but wants to test the controller before buying parts. The transformer has a proprietary plug not available locally.

Testing Steps with a Multimeter

1. Verify 120 VAC at the wall outlet.
2. Plug in the transformer; check if the controller display lights up.
3. Attempt a controller reset (small button on the unit).
4. Measure transformer output: should be ~24 VAC. If not, replace the transformer.

Checking Solenoids Without Power

Set the meter to ohms. At the controller terminal strip, place one probe on the common (C) terminal and the other on each zone terminal. A healthy solenoid reads 25‑50 Ω. A lightning strike often fries solenoids, so test each one.

Temporary Transformer Substitute

If the exact Rain Bird transformer is unavailable, a generic 24 VAC transformer with the same VA rating from an electronics store (e.g., RadioShack) can be used for testing.

Professional Supply Option

The responder offers to ship a transformer from Aquarius Supply (www.aquariussupply.com) and provides a work email for orders.