Panasonic U-8MF2E8 Service Manual page 125

1. Contents of Remote Controller
Switch Alarm Display
Thermistor fault Indoor thermistor is either
open or damaged.
Outdoor thermistor is either
open or damaged.
Activation of Protective device in indoor
protective unit is activated.
device
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 compressor No. 1 is activated.
for compressor
Protective device for
is activated
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
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 temperature sensor (SCT)
Temp. sensor at refrigerant gas outlet of dual-tube (SCG)
High pressure sensor failure. High pressure trouble.
Low-pressure sensor failure
Outdoor No. 2 coil gas temp. sensor (EXG2)
Outdoor No. 2 coil liquid temp. sensor (EXL2)
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.
O sensor (detects low oxygen level) activated
2
Compressor thermal protector is activated. Power supply
voltage is unusual. (The voltage is more than 260 V or less
than 160 V between L and N phase.)
Incorrect discharge temperature. (Comp. No. 1)
High pressure switch is activated.
Negative (defective) phase.
DCCT overcurrent
Incorrect discharge temperature. (Comp. No. 2)
Outdoor unit fan motor is unusual.
Inverter for compressor is unusual.
(DC compressor does not operate.)
When alarm message in other indoor units occurs in case of
group control, unalarmed state of indoor units are inoperative.
Compressor No. 1 current trouble (overcurrent)
Current is not detected when comp. No. 1 is ON.
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
IPM trip (IPM current or temperature)
5 - 3
3WAY SYSTEM
Trouble Diagnosis
ON: Blinking: OFF:
Wired
Wireless
remote
remote controller
control
receiver display
display
<<F01>>
Operating and
timer lamps blinking
<<F02>>
alternately
<<F03>>
<<F10>>
<<F11>>
F04
F05
F06
Operating and timer
F07
lamps blinking
F08 altemately
F12
F14
F16
F17
F23
F24
<<P01>>
Timer and heat
ready lamp blinking
<<P09>>
altemately
<<P10>>
P12
P14
P02
Operating and heat
ready lamp blinking
P03
altemately
P04
P05
P16
P17
P22
P29
P31
Operating and timer
lamp blinking
F29
simultaneously
Operating and timer
lamp blinking
F31
simultaneously
H01
H03
H11
H12
Timer lamp blinking
H13
H15
H06
H08
H27
H31
5