Panasonic U-72MF2U9 Service Manual page 165

1. Contents of Remote Controller
Switch Alarm Display
Thermistor fault Outdoor thermistor is either
open or damaged.
Activation of pro- Protective device in indoor unit
tective device is activated.
Protective device in outdoor
unit is activated.
Indoor unit communication
error of group control wiring.
EEPROM on indoor unit PCB failure
EEPROM on the main or sub outdoor unit PCB has failed.
Protective Protective device for
device for compressor No. 1 is activated.
compressor is
activated
Protective device for
compressor No. 2 is activated.
Oil sensor fault.
(Disconnection, etc.)
Abnormal device function
<< >> alarm indication: Does not affect the operation of other indoor units.
< > alarm indication: In some cases may affect the operation of other indoor units.
Possible cause of malfunction
SCT thermistor at the suction refrigerant of compressors has
failure. (SCT)
SCG thermistor at the outlet of subcooling heat exchanger in
outdoor unit has failure. (SCG)
High pressure sensor of the outdoor unit has failure. (HPS)
Low pressure sensor of the outdoor unit has failure. (LPS)
EXG2 thermistor at the gas side of 2nd heat exchanger of the
outdoor unit has failure. (EXG2)
EXL2 thermistor at the liquid side of 2nd heat exchanger of
the outdoor unit has failure. (EXL2)
Indoor fan motor activated thermal protector.
Connection to the panel of indoor unit is not good.
Float switch of drain pan safety is activated.
Indoor fan inverter protection control is activated.
Input detected at EXCT terminal on indoor PCB for refrigerant
detector.
1st compressor discharge temperature too high.
Protection device activated. High pressure switch (63PH, 63PH1
or 63PH2) or compressor thermal protector (49C1 / 49C2).
Open phase in power input is detected at HIC for 1st
compressor.
Open phase in power input is detected at HIC for 2nd
compressor.
Overcurrent of 1st compressor on the secondary side of
inverter circuit, or inverter failed to syncronize with rotation.
2nd compressor discharge temperature too high.
Inverter for 2nd compressor failed to start or failed to
syncronize with rotation.
Fan motor or inverter drive of outdoor unit has failure.
Overcurrent of 2nd compressor on the secondary side of
inverter circuit, or inverter failed to syncronize with rotation.
Inverter for 1st compressor failed to start or failed to
syncronize with rotation.
Other indoor unit in group control has an alarm.
Overcurrent in 1st compressor.
Current sensor for the 1st compressor is disconnected or
shorted.
DISCH1 thermistor at the discharge of 1st compressor is
disconnected, shorted or misplaced. (DISCH1)
Overcurrent in 2nd compressor.
Current sensor for the 2nd compressor is disconnected or
shorted.
DISCH2 thermistor at the discharge of 2nd compressor is
disconnected, shorted or misplaced. (DISCH2)
Low pressure is too low.
OIL1 thermistor for the oil of 1st compressor has failure. (OIL1)
OIL2 thermistor for the oil of 2nd compressor has failure. (OIL2)
HIC for 2nd compressor has failure. Overcurrent or overheat
of HIC.
HIC for 1st compressor has failure. Overcurrent or overheat of
HIC.
5 - 3
3WAY VRF SYSTEM
Trouble Diagnosis
ON: Blinking: OFF:
Wired
Wireless
remote
remote controller
control
receiver display
display
F12
F14
Operating and
timer lamps blinking
alternately
F16
F17
F23
F24
<<P01>>
Timer and heat
<<P09>>
ready lamp blinking
alternately
<<P10>>
<<P12>>
P14
P03
P04
P05
P15
Operating and heat
P16
ready lamp blinking
alternately
P17
P19
P22
P26
P29
<P31>
Operating and
timer lamp blinking
F29 simultaneously
Operating and
timer lamp blinking
F31 simultaneously
H01
H03
H05
H11
H13
Timer lamp blinking
H15
H06
H08
H27
H21
H31
1
2
3
4
5
6
7
8
9