Panasonic U-4LE1R8 Service Manual page 90

3. Mini VRF System Alarm Codes
Sigle-phase outdoor unit HIC board
4WAY Valve
(CN-20S)
Crankcase
heater
(CN-CH)
CN-VDC-
CN-VDC+
3-phase outdoor unit HIC board
3
4WAY Valve
(CN-20S)
Crankcase
heater
(CN-CH)
NU W V
PIN2 NU W V
(VDC-)
U P
U P PIN1
(VDC+)
3-50
Mini VRF SYSTEM
Trouble Diagnosis