Mitsubishi Heavy Industries FDT90VNPWVH Service Manual page 122

Standard inverter packaged air-conditioners
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Error of signal transmission
① ②
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source
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② ③
-
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② ③
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Defective indoor unit PCB
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Wiring error including power cable, defective indoor/
outdoor unit PCB
Defective outdoor unit PCB
Defective outdoor unit PCB. Check crossover wires.
121
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'09•SRK-DB-087D
'19 • PAC-SM-334

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