Multi F Four-Way Ceiling Cassette Service Manual

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Part 5. Trouble Shooting

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39

Transmission Error

Between (PFC Micom →

INV Micom)

Communication Error

Between PFC Micom

and INV Micom.

1. Micom defect/Circuit defect

2. Different Micom S/W Version

3. ODU inverter PCB assembly damage

Display

code

Title Cause of error Check point & Normal condition

■ Error Diagnosis and Countermeasure Flow Chart

Is Inverter PCB assembly normal?

No

Replace inverter PCB assembly

Is PFC Micom & INV Micom

S/W Program normal?

No

Upgrade Micom Program

Yes

Yes

Recheck power and installation condition