Panasonic U-4LE1R8 Service Manual page 75

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
4WAY Valve
(CN-20S)
Crankcase
heater
(CN-CH)
PIN2
(VDC-)
NU W V U
NU W V U
3-35
P
P PIN1
(VDC+)
Mini VRF SYSTEM
Trouble Diagnosis
3