Service manual
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11.6 Indoor Unit Error Display:E5 or E6
11.7 Indoor Unit Error Display:E4
11.8 Indoor Unit Error Display:E1
EEROM error, indoor PCB is defective.
11.9 Indoor Unit Error Display:E2
This is alarm signal when the main chip can’t detect over-zero signal. When such failure occurs, the main control board
must have fault.