Testing Process (continued):
9. Once all indoor units have been checked, the digital display will show either “EC” or “0”
• “EC” indicates there is an error in the wires to the indoor unit(s).
• The LED(s) will be flashing, indicating which circuit(s) has the fault.
• For example, if the wires for circuit A and B are switched, then LED1 and
LED 2 will flash.
• Once the wiring is corrected, re-run this test to confirm everything is functional.
o “0” indicates that all wiring is correct.
o If all the wiring is correct, the LED’s remain solid.
10. Once the test is complete, make sure to change the dip switches back to the OFF
position. And set each indoor unit to preferred set points.
3
Service Bulletin
JUNE 2019
DFS05-19
DFS05-19
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