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Pioneer YN020GMFI22M2D Service Manual page 34

Multi split system outdoor units/two, three, four and five zones
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8.4.1.2 Communication malfunction between indoor and outdoor units diagnosis and
solution.
Malfunction decision
conditions
Supposed causes
Trouble shooting:
Indoor unit does not receive the feedback from outdoor unit
during 120 seconds.
● Wiring mistake
● Indoor or outdoor PCB faulty
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