Panasonic U-72MF1U9 Service Manual page 86

3. W-3WAY VRF Alarm Codes
P05 Alarm
Alarm code
Alarm meaning
Alarm conditions
Probable cause
Check
Correction
Example
Notes
P16 Alarm
Alarm code
Alarm meaning
Alarm conditions
Probable cause
Check
Correction
Example
1
Notes
2
3
4
5
6
7
P05
Reverse phase (or missing phase) detected
This alarm occurs when a reverse phase or missing phase is detected in the L1-L2-L3 phases.
Reverse phase or missing phase in the L1-L2-L3 phases
Check the wiring at the power terminal plate.
Switch the phases and reinsert. Check if the result is OK.
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P16
Compressor 1 (INV) overcurrent alarm
This alarm occurs when current trouble or current detection trouble occurs at an inverter frequency
of less than 80 Hz after start (when trouble judgment current is detected in the primary or
secondary current, or when an instantaneous secondary current of 48 A or higher is detected).
There is a strong possibility of a compressor failure.
An alarm occurs for current detection trouble when it is judged that no current is flowing after start
(DCCT is damaged). In this case, the cause is a DCCT failure.
Check the power wiring and connector wiring.
It is possible to resolve this trouble by limiting the maximum frequency.
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Trouble Diagnosis