Panasonic U-72MF1U9 Installation Instructions Manual page 51

Possible cause of malfunction
Activation of Protective device in indoor unit
protective device is activated.
Protective device in outdoor unit
is activated.
Thermistor fault Indoor thermistor is either
openor damaged.
Outdoor thermistor is either
open or damaged.
EEPROM on indoor unit P.C.B. failure
Protective device Protective device for compressor
for compressor No. 1 is activated.
is activated
Protective device for compressor
No. 2 is activated.
Oil sensor fault.
(Disconnection, etc.)
Thermal protector in indoor unit fan motor is activated.
Improper wiring connections of ceiling panel.
Float switch is activated.
O sensor (detects low oxygen level) activated
2
Incorrect discharge temperature. (Comp. No. 1)
High pressure switch or over-load relay is activated.
Power supply voltage is unusual. (The voltage is less than 160 V
between L1 and L2 phase.)
Negative (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)
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 (E2)
Indoor coil temp. sensor (E3)
Indoor suction air (room) temp. sensor (TA)
Indoor discharge air temp. sensor (BL)
Comp. No. 1 discharge gas temp. sensor (DISCH1)
Comp. No. 2 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 intake port temperature 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 is ON.
Discharge gas temperature of the comp. No. 1 is not detected.
Temp. sensor is not seated at the sensor holder.
Compressor No. 2 current trouble (overcurrent)
Compressor No. 2 current trouble (locked)
Compressor No. 2 CT sensor disconnected or short circuit
Compressor No. 2 discharge temp. sensor disconnected
Low pressure switch is activated.
Comp. No. 1 oil sensor
Comp. No. 2 oil sensor
51
Alarm
message
<<P01>>
<<P09>>
<<P10>>
P14
P03
P04
P05
P16
P17
P22
P26
H31
P29
<<F01>>
<<F02>>
<<F03>>
<<F10>>
<<F11>>
F04
F05
F06
F07
F08
F12
F16
F17
F23
F24
F29
F31
H03
H05
H11
H12
H13
H15
H06
H08
H27
Continued