Trouble Diagnosis; Contents Of Remote Controller Switch Alarm Display - Panasonic U-120ME2U9 Service Manual

1. Contents of Remote Controller
Switch Alarm Display
Serial communi- Remote controller is detecting
cation errors error signal from indoor unit.
Mis-setting
Controller does not respond to indoor unit.
Indoor unit is detecting error
signal from outdoor unit.
Outdoor unit is detecting error
signal from indoor unit.
Improper setting
1
Improper setting
Indoor unit communication
error of group control wiring
During auto. address setting,
number of connected units
2
does not correspond to
number set.
3
Improper setting
4
5
Thermistor fault Indoor unit
6
7
Outdoor unit
8
9
Possible cause of malfunction
Indoor unit does not respond to remote controller.
The remote controller is having error in sending serial
communication signal.
Outdoor unit does not respond to indoor unit.
Some indoor units does not respond to outdoor unit.
Indoor unit address is dupulicating.
Two or more remote controllers are set as main on R1-R2 link. <<E09>>
Auto Address failed to start.
No response from sub indoor to the main indoor unit in group
control wiring.
Fewer indoor units are found in Auto Addressing than the
setting on outdoor PCB.
More indoor units are found in Auto Addressing than the
setting on outdoor PCB.
No indoor unit responded in Auto Addressing.
No response from sub outdoor unit.
The outdoor unit address is duplicating.
The number of responding outdoor units does not match with
the setting on the main outdoor unit.
No response from main outdoor unit.
The outdoor unit is having error in sending serial
communication signal on main-sub communication line.
Error in communication inside outdoor unit control box.
Indoor unit model does not match with the outdoor unit model.
(Multi-split/mini-split)
Two or more indoor units are set as main in group control.
Two or more indoor units are set as priority indoor unit.
Two or more indoor units are set as priority indoor unit.
Group control wiring is detected for indoor unit set as
individual control.
Indoor unit address is not set.
Capacity setting of indoor unit is not correct.
Duplicate system address setting on outdoor units.
Capacity setting of outdoor unit is not correct.
Model mismatch between outdoor units in one refrigerant
circuit.
Reversing valve or solenoid valve failure.
E1 thermistor on liquid side of indoor heat exchanger has
failure. (E1)
Indoor unit set as single split. (E2)
E3 thermistor on gas side of indoor heat exchanger has
failure. (E3)
TA thermistor for intake air temperature (room temperature) of
the indoor unit has failure. (TA)
BL thermistor for supply air temperature of the indoor unit has
failure. (BL)
DISCH1 thermistor at the discharge of 1st compressor
reading is abnormal.
DISCH2 thermistor at the discharge of 2nd compressor
reading is abnormal.
EXG1 thermistor at the gas side of 1st heat exchanger of the
outdoor unit has failure. (EXG1)
EXL1 thermistor at the liquid side of 1st heat exchanger of the
outdoor unit has failure. (EXL1)
TO thermistor for outdoor ambient air temperature has failure.
(TO)
5 - 2
2WAY VRF SYSTEM

Trouble Diagnosis

ON: Blinking: OFF:
Wired
Wireless
remote
remote controller
control
receiver display
display
<E01>
Operating lamp
blinking
<E02>
<<E03>>
E04
Heating ready lamp
blinking
E06
E08
Operating lamp
blinking
E12
E18
E15
E16
Heating ready lamp
blinking
E20
E24
E25
E26
E29
E30
E31
<<L02>>
Operating and heating
ready lamps blinking
<L03>
simultaneously
L05
L06
L07
L08
<<L09>>
Operating and heating
L04
ready lamps blinking
simultaneously
L10
L17
L18
<<F01>>
<<F02>>
Operating and
timer lamps blinking
<<F03>>
alternately
<<F10>>
<<F11>>
F04
F05
Operating and
timer lamps blinking
alternately
F06
F07
F08
Continued