Panasonic U-72MF1U9 Service Manual page 19

6. Meaning of Alarm Messages
Possible cause of malfunction
Activation of Protective device in indoor unit
protective is activated.
device
Thermistor fault Indoor thermistor is either open
or damaged.
Outdoor thermistor is either
open or damaged.
EEPROM on indoor unit PCB failure
Protective Protective device for
device for compressor No.1 (INV) is
compressor is activated.
activated
Protective device for
compressor No.2 (constant
speed) is activated
Low oil level alarm.
Oil sensor fault.
(Disconnection, etc.)
Thermal protector in indoor unit fan motor is activated.
Improper wiring connections of ceiling panel.
Float switch is activated.
Operation of protective function of fan inverter.
2
O sensor (detects low oxygen level) activated.
Incorrect discharge temperature. (Comp. No. 1 (INV))
High pressure switch is activated.
Negtive (defective) phase.
Compressor running failure resulting from missing phase in the
compressor wiring, etc. (Start failure not caused by IPM or no gas.)
Incorrect discharge temperature. (Comp. No. 2 (constant speed))
Outdoor unit fan motor is unusual.
Overcurrent at time of compressor runs more than 80Hz (DCCT
secondary current or ACCT primary current is detected at a time other
than when IPM has tripped.)
IPM trip (IPM current or temperature)
Inverter for compressor is unusual. (DC compressor does not operate.)
Indoor coil temp. sensor (E1)
Indoor coil temp. sensor (E3)
Indoor suction air (room) temp. sensor (TA)
Indoor discharge air temp. sensor (BL)
Comp. No. 1 (INV) discharge gas temp. sensor (DISCH1)
Comp. No. 2 (constant speed) discharge gas temp. sensor (DISCH2)
Outdoor No. 1 coil gas temp. sensor (EXG1)
Outdoor No. 1 coil liquid temp. sensor (EXL1)
Outdoor air temp. sensor (AIR TEMP)
Compressor suction temp. sensor (SCT)
High pressure sensor.
Low-pressure sensor failure
Outdoor No. 2 coil gas temp. sensor (EXG2)
Outdoor No. 2 coil liquid temp. sensor (EXL2)
EEPROM on the main or sub outdoor unit PCB has failed.
Current is not detected when comp. No. 1 (INV) is ON.
Overload current is detected.
Lock current is detected.
Current is not detected when comp. No.2 (constant speed) is ON.
Discharge gas temperture of comp. No.2 (constant speed) is not
detected.
Low pressure trouble
Comp. No.1 (INV) oil sensor
Comp. No.2 (constant speed) oil sensor
1 - 15
Test Run
Alarm
Message
<<P01>>
<<P09>>
<<P10>>
P12
P14
P03
P04
P05
P16
P17
P22
P26
H31
P29
<<F01>>
<<F03>>
<<F10>>
<<F11>>
1
F04
F05
F06
F07
F08
2
F12
F16
F17
F23
F24
3
F29
F31
H03
H11
H12
4
H13
H15
H06
H07
H08
5
H27
Continued
6
7