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I just replaced my Orbit Model # 27999 for a NO AC message/fault. Installed unit, programed zones and tested each one manually. All sprinkler solenoids operated fine. Ran the program manually, got intermittent NO AC fault. Tried another power source. NO AC is displayed after resetting the circuit breaker or reseating the power cord. When running any zone, get NO AC after about 10 minutes. Called Orbit, took unit back to store and exchanged it for another. Same thing happened. All Orbit sprinkler solenoids work just fine, controller gets NO AC fault when trying to run one or on auto.
Have a good one,
Dan
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