Sunlight Supply Samsung Programmable Thermostat for Split Systems - Manual (Page 90)

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AC zero cross signal error
Indoor display ሱ ل ሱ Outdoor error
Outdoor display م م ሱ AC zero cross signal error
1.Checklist :
1) Check the power condition at customer's house (Is there any power noise?)
2) Have been there power failure?
2. Troubleshooting procedure
Is the AC line zero cross signal error
appeared again?
YES
Terminate the
service NO
Exchange the Outdoor PBA
Restart a Ōer power oī