CS-E21JB4EA, CU-E21HBEA - Panasonic Air Conditioner Service Manual (repair manual). Page 59

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59
15.5.12. H33 (Unspecified Voltage between Indoor and Outdoor)
Malfunction Decision Conditions
• The supply power is detected for its requirement by the indoor/outdoor transmission.
Malfunction Caused
• Wrong models interconnected.
• Wrong indoor unit and outdoor unit PCBs used.
• Indoor unit or outdoor unit PCB defective.
Troubleshooting
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