Controller replacement means removing the old timer, mounting a new one, moving the zone and common wires to the new terminals and programming the schedule.
It’s also a chance to consider features such as weather-based adjustment or app control, if they suit your system.
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Signs You May Need This Repair
- Controller won’t power on despite good power
- Failed station outputs
- Erratic behavior
- Outdated controller that’s hard to program
- Storm or surge damage
Common Causes
- Internal failure
- Surge damage
- Age
- Moisture damage
How a Technician Handles It
- Confirm the controller has failed by testing power and outputs
- Label existing wires
- Install and wire the new controller
- Program zones and schedules
- Test each zone
Repair or Replace?
Replace the controller when testing confirms it has failed or when its limitations are causing problems. If the issue is wiring or valves, a new controller won’t fix it.
DIY or Call a Pro?
Some homeowners replace plug-in controllers themselves, but wiring errors are common. A technician can confirm the controller is really the problem first.
Typical Cost
See our Sprinkler Controller Replacement Cost Guide for typical ranges. Prices vary by location, parts, access and how much diagnosis is needed.
Related Problems
- Why Is My Sprinkler Controller Screen Blank?
- Why Isn’t My Sprinkler Controller Working?
- Why Won’t My Sprinkler System Turn On?
Related Repairs
Frequently Asked Questions
How do I know if I need a new controller?
When power and wiring check out but outputs fail or the controller behaves erratically.
Should I get a smart controller?
It depends on your system and goals. A technician can help you decide.
Will a new controller fix zones that don’t run?
Only if the controller was the problem. Wiring and valves should be checked first.
Bottom Line
Controller replacement makes sense when the controller has failed or no longer meets your needs. Testing first ensures you’re fixing the right part.
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