Specifications

SiUS39-601 Troubleshooting by Remote Controller
Troubleshooting 117
Outdoor
Unit
LA 999Malfunction of power unit —
LC 999Malfunction of transmission between inverter and
control PC board
166
P1 999Inverter over-ripple protection 168
P4 999Malfunction of inverter radiating fin temperature rise
sensor
170
PJ 999Faulty field setting or faulty combination of PC board 171
System
U0 879Low pressure drop due to refrigerant shortage or
electronic expansion valve failure
172
U1 999Reverse phase / open phase 174
U2 999Power supply insufficient or instantaneous failure 175
U3 999Check operation is not conducted. 177
U4 999Malfunction of transmission between indoor and
outdoor units
178
U5 999Malfunction of transmission between remote
controller and indoor unit
180
U5 787Failure of remote controller PC board or setting
during control by remote controller
180
U7 999Malfunction of transmission between outdoor units 181
U8 997Malfunction of transmission between main and sub
remote controllers (malfunction of sub remote
controller)
183
U9 999Malfunction of transmission between indoor unit and
outdoor unit in the same system
184
UA 999Excessive number of indoor units etc. 186
UC 888Address duplication of central remote controller 188
UE 999Malfunction of transmission between central remote
controller and indoor unit
189
200
UF 999Refrigerant system not set, incompatible wiring /
piping
191
UH 999Malfunction of system, refrigerant system address
undefined
192
Central
remote
Control
ler and
Schedu
le
Timer
M1 8 or 79 9Central remote controller or schedule timer PC board
defect
194
202
M8 8 or 79 9Malfunction of transmission between optional
controllers for centralized control
195
203
MA 8 or 79 9Improper combination of optional controllers for
centralized control
197
205
MC 8 or 79 9Address duplication, improper setting 199
207
Heat
Reclai
m
Ventilat
ion
64 879Indoor unit’s air thermistor error —
65 879Outside air thermistor error —
6A 879Damper system alarm —
6A 999Damper system + thermistor error —
6F 879Malfunction of simple remote controller —
6H 879Malfunction of door switch or connector —
94 999Internal transmission error —
Malfunction
code
Operation
lamp
Inspection
display
Unit No. Malfunction contents Page
Referred
The system operates for malfunction codes indicated in black squares, however, be sure to check and repair.