Panasonic U-72MF1U9 Service Manual page 65

1. Contents of Remote Controller Switch Alarm Display
Outdoor unit
Thermistor
fault
Ceiling panel connection failure
Protective Indoor unit
device
Outdoor unit
Failure of nonvolatile memory IC (EEPROM) on indoor unit control PCB
Failure of nonvolatile memory IC (EEPROM) on outdoor unit control PCB
Overload current detected.
Protective
Lock current detected.
device
No current detected when
compressor was ON.
Discharge temp. sensor
trouble
Outdoor unit protection
Outdoor unit protection
Connection failure of oil detection sensor
Fusing of electromagnetic contact (Current detected when compressor was OFF)
Automatic backup operation
<< >> 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
Compressor 1 (INV) discharge temp. sensor
Compressor 2 (constant speed) discharge temp. sensor
Outdoor air temp. sensor
Heat exchanger 1 liquid temp. senso r
Heat exchanger 1 gas temp. senso r
Compressor intake temp. sensor (suction temp)
High-pressure sensor
Low-pressure sensor
Heat exchanger 2 liquid temp. senso r
Heat exchanger 2 gas temp. senso r
Thermal protector in indoor unit fan motor is activated.
Float switch is activated.
Fan inverter protection function activated.
Oxygen (O ) gas sensor activated
2
Compressor 1 (INV) discharge temp. trouble
High-pressure switch or Overload Protector (OLR)
Reverse phase (missing phase) detected.
DCCT, ACCT overcurrent (compressor less than 80 Hz)
Compressor 2 (constant speed) discharge temp. trouble
Outdoor unit fan trouble
DCCT, ACCT overcurrent (80 Hz or more)
Start failure caused by compressor wire missing phase, DCCT
failure, or similar problem (INV compressor start failure).
Compressor 2 (constant speed)
Compressor 2 (constant speed)
Compressor 1 (INV)
Compressor 2 (constant speed)
Compressor 2 (constant speed)
Low-pressure trouble
HIC trouble alarm
Compressor 1 (INV)
Compressor 2 (constant speed)
3 - 3
Trouble Diagnosis
ON: Blinking: OFF:
Wired
Wireless
remote
remote controller
control
receiver display
display
F04
F05
F08
F07
Operating and timer
lamps blinking
F06
alternately
F12
F16
F17
F24
F23
<<P09>>
Timer and heat
<<P01>> ready lamp blinking
alternately
<<P10>>
<<P12>>
P14
P03
P04
P05
Operating and heat
P16
ready lamp blinking
P17 alternately
P22
P26
P29
Operating and timer
lamp blinking
simultaneously
F29
Operating and timer
lamp blinking
simultaneously
F31
H11
H12
H03
H13
Timer lamp blinking
H15
H06
H31
H08
H27
only blinking (No display changes)
1
2
3
4
5
6
7