Why Is My Sprinkler Timer Not Working?
A controller that's blank, frozen, or skipping zones is the most fixable problem on this list — when you know what to check.
Sprinkler timers fail for four main reasons: dead backup battery, lost power at the outlet, a blown fuse or surge-damaged internal board, or a scheduling error after a power blink. Many can be solved in a single visit — and sometimes by phone if you can read us what the display shows.
Does this match what you're seeing?
If any of these describe your system, you're on the right page.
Here's what's usually going on, in priority order
We start at the most common cause and work down — the same way a real irrigation tech diagnoses.
Dead backup battery
Most controllers use a 9V or coin battery to hold the schedule during power outages. When it dies, every power blink wipes the program.
Power loss at the outlet or transformer
A tripped GFCI, unplugged transformer, or failed wall-wart kills the controller entirely.
Blown internal fuse or surge damage
South Florida lightning takes out controller boards constantly. Sometimes only one zone output fails; sometimes the whole controller is gone.
Rain or freeze sensor stuck active
A failed sensor can tell the controller to skip every cycle even when conditions are fine.
Programming error after a power blink
If start times got cleared or AM/PM got flipped, the controller will appear off even though it's working perfectly.
Real method, not guesswork
Every visit follows the same structured diagnostic so you only pay for what's actually wrong.
- Confirm power at the outlet and at the controller transformer
- Test the backup battery and replace if weak
- Check the rain sensor wire and override switch
- Read the full program with the homeowner to rule out scheduling errors
- Meter each station output for surge damage
What we can do about it
Most of these problems have a repair path first. We only recommend replacement when it's the right call.
Repair paths
When replacement makes more sense
- Visible burn marks or melted components on the board
- Multiple station outputs are dead
- Controller is 10+ years old and parts are obsolete
- You want WiFi or weather-based scheduling — older controllers don't support it
Why this looks different in Miami
Miami-Dade and Broward see more lightning per square mile than almost anywhere in the country. We recommend a quality surge protector on every irrigation controller — it pays for itself the first storm season.
No two repairs are identical — here's what drives the price
We quote in person after diagnosis so you know exactly what you're paying for.
- Replacement vs simple battery and program fix
- Controller brand and number of zones
- Whether you want smart / WiFi capability
- Surge protector add-on
Questions Miami homeowners ask
Real answers from the field, not boilerplate.
How do I reset my sprinkler timer?
On most Hunter and Rain Bird controllers there's a small reset button or dial position. Hold it 5-10 seconds. You'll have to reprogram afterward — write down your current schedule before resetting.
Why does my sprinkler timer keep losing the schedule?
Almost always a dead backup battery. Replace it ($5 part) and reprogram. If it loses the schedule again within a few months, the controller board is failing.
Should I upgrade to a smart sprinkler controller?
If your controller is more than 8 years old, yes. Smart controllers cut water use 15-30% by adjusting to weather, and most pay for themselves within two seasons in Miami.
Can a power surge damage my sprinkler timer?
Yes. Surges from nearby lightning are the single biggest cause of controller failure in South Florida. We add a surge protector to every install we do.
Let's get your sprinklers working right.
Same-week service across Miami-Dade and Broward. Free estimate, no pressure, no upsell on parts you don't need.