Panasonic CU-8ME1XPK - Page 518

PACD011001C2 Troubleshooting by Remote Controller
Troubleshooting UM Combination “MA1R Series” Using R-407C 497
Outdoor
Unit
J6
999
Malfunction of thermistor (R2T) for heat exchanger
(loose connection, disconnection, short circuit, failure)
519
J6
879
Malfunction of thermistor (R2T) for heat exchanger
(loose connection, disconnection, short circuit, failure)
519
JA
999
Malfunction of discharge pipe pressure sensor 520
JC
999
Malfunction of suction pipe pressure sensor 521
JH
879
Malfunction of oil temperature thermistor (R5T) —
L0
999
Failure of inverter system —
L4
999
Malfunction of inverter radiating fin temperature rise 535
L5
999
Inverter instantaneous over-current 536
L6
999
Compressor motor insulation defect, short circuit —
L8
999
Inverter thermostat sensor, Compressor overload 537
L9
999
Inverter stall prevention, Compressor lock 538
LA
999
Malfunction of power unit —
LC
999
Malfunction of transmission between inverter and
control PC board
539
System
P0
979
Gas depletion (heat build up) —
P1
999
Inverter over-ripple protection 541
P4
999
Malfunction of inverter radiating fin temperature rise
sensor
542
U0
879
Low pressure drop due to refrigerant shortage or
electronic expansion valve failure
522
U1
999
Negative phase / open phase 523
U2
999
Power supply insufficient or instantaneous failure 540
U4
999
Malfunction of transmission between indoor units 524
U5
999
Malfunction of transmission between remote controller
and indoor unit
525
U5
787
Failure of remote controller PC board or setting during
control by remote controller
—
U7
999
Malfunction of transmission between indoor units
Malfunction of transmission between outdoor units,
malfunction of transmission between outdoor unit and ice
build-up heat unit
—
U7
879
Malfunction of transmission between outdoor units (cool/
heat unified, low noise)
526
U8
997
Malfunction of transmission between master and slave
remote controllers (malfunction of slave remote
controller)
527
U9
999
Malfunction of transmission between indoor and outdoor
units in the same system
528
UA
999
Excessive number of indoor units 529
UC
888
Address duplication of central remote controller 530
UE
999
Malfunction of transmission between central remote
controller and indoor unit
543
UF
999
Refrigerant system not set, incompatible wiring / piping 531
UH
999
Malfunction of system, refrigerant system address
undefined
532
Centralized
Control and
Schedule
Timer
UE
999
Malfunction of transmission between central remote
controller and indoor unit
543
548
M1
8
or
99 9
PC board defect 544
549
M8
8
or
99 9
Malfunction of transmission between optional controllers
for centralised control
545
550
MA
8
or
99 9
Improper combination of optional controllers for
centralised control
546
551
MC
8
or
99 9
Address duplication, improper setting 547
552
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.
Malfunction
code
Operation
lamp
Inspection
display
Unit No. Malfunction contents Page
Refered