Manual advance works; auto sequence fails on a 4-zone Hydrotek 2120.
Controller logic board failed. Replace unit. Hydrotek is obsolete; modern 4-zone controllers (Rain Bird ESP-4TM, Hunter XC-4) are $80–$120.
Irritrol RD600 Pump Start Signal Every 60 Sec: Test Controller Output Continuity
Troubleshooting Sprinkler System Error Codes After Plumbing Work
Rain Bird RC‑7BI: Manual Zone Advance Works but Auto Start Fails
Hardie Rain Dial: One Station Runs With System Off – Valve or Controller?
Pump Relay Not Clicking? Check Voltage at Relay & Controller
Rain Bird ESP-6SI Auto Program Skips Stations 4 and 5: Verify Programming Steps
System Won't Water: Check Water Supply First, Then Controller Voltage
Hardie 9‑Station Controller Replacement: Irritrol Rain Dial
Hunter i-Core "Station Overflow" Error: Finding the Leak
Toro TMC-212 "FUSE" & "dL y5" Errors: Causes & Reset
Rain Bird RC-1260BI: Zones Won't Activate, Clock Runs
Hunter SRC Plus Unreliable After 6 Years: Replace Controller
Two-Station Controller: Station 1 Runs When It Shouldn't—Program Separation Needed
Rain Bird RC-7A Station Overlap: Controller Port or Valve Fault?
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