Panasonic Urban Multi MX1R Series Service Manual page 176

PACD011001C2
Malfunction
code
Outdoor J6
Unit
J6
JA
JC
JH
L0
L4
L5
L6
L8
L9
LA
LC
System P0
P1
P4
U0
U1
U2
U4
U5
U5
U7
U7
U8
U9
UA
UC
UE
UF
UH
Centralized UE
Control and
Schedule
M1
Timer
M8
MA
MC
In case of the malfunction with the shaded error code, the unit still operates. However, be sure to have it inspected and
repaired and as soon as possible.
Troubleshooting Urban Multi "MX1, ME1 Series" Using R-22
Operation Inspection Unit No.
lamp display
9 9
8 7
9 9
9 9
8 7
9 9
9 9
9 9
9 9
9 9
9 9
9 9
9 9
9 7
9 9
9 9
8 7
9 9
9 9
9 9
9 9
7 8
9 9
8 7
9 9
9 9
9 9
8 8
9 9
9 9
9 9
9 9
8 or 9
9
8 or 9
9
8 or 9
9
8 or 9
9
Malfunction contents
Malfunction of thermistor (R2T) for heat exchanger
9
(loose connection, disconnection, short circuit, failure)
Malfunction of thermistor (R2T) for heat exchanger
9
(loose connection, disconnection, short circuit, failure)
Malfunction of discharge pipe pressure sensor
9
Malfunction of suction pipe pressure sensor
9
Malfunction of oil temperature thermistor (R5T)
9
Failure of inverter system
9
Malfunction of inverter radiating fin temperature rise
9
Inverter instantaneous over-current
9
Compressor motor insulation defect, short circuit
9
Inverter thermostat sensor, Compressor overload
9
Inverter stall prevention, Compressor lock
9
Malfunction of power unit
9
Malfunction of transmission between inverter and
9
control PC board
Gas depletion (heat build up)
9
Inverter over-ripple protection
9
Malfunction of inverter radiating fin temperature rise
9
sensor
Low pressure drop due to refrigerant shortage or
9
electronic expansion valve failure
Negative phase / open phase
9
Power supply insufficient or instantaneous failure
9
Malfunction of transmission between indoor units
9
Malfunction of transmission between remote controller
9
and indoor unit
Failure of remote controller PC board or setting during
7
control by remote controller
Malfunction of transmission between indoor units
9
Malfunction of transmission between outdoor units,
malfunction of transmission between outdoor unit and ice
build-up heat unit
Malfunction of transmission between outdoor units (cool/
9
heat unified, low noise)
Malfunction of transmission between master and slave
7
remote controllers (malfunction of slave remote
controller)
Malfunction of transmission between indoor and outdoor
9
units in the same system
Excessive number of indoor units
9
Address duplication of central remote controller
8
Malfunction of transmission between central remote
9
controller and indoor unit
Refrigerant system not set, incompatible wiring / piping
9
Malfunction of system, refrigerant system address
9
undefined
Malfunction of transmission between central remote
9
controller and indoor unit
PC board defect
9
Malfunction of transmission between optional controllers
9
for centralised control
Improper combination of optional controllers for
9
centralised control
Address duplication, improper setting
9
Troubleshooting by Remote Controller
Page
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