Panasonic U-72MF1U9 Service Manual page 84

3. W-3WAY VRF Alarm Codes
Correction
Example
Notes
1
2
3
4
5
6
7
(1) Replace the sensor.
(2) Replace the outdoor unit PCB.
(3) Correct the problem locations.
All of the probable causes
Operates continuously for a set length of time.
Indicates 2.5 minutes or longer for an inverter compressor (compressor 1) and 30 seconds or
longer for a constant-speed compressor (compressor 2).
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Trouble Diagnosis