Service manual

SiUS28-902_a Troubleshooting by Remote Controller
Troubleshooting 80
Outdoor Unit LA lllMalfunction of power unit —
LC lllMalfunction of transmission between inverter and
control P.C.B.
127
P4 klkMalfunction of inverter radiating fin temperature rise
sensor
128
System
U0 khlLow pressure drop due to refrigerant shortage or
electronic expansion valve failure
129
U1 lllReverse phase / open phase —
U2 lllPower supply insufficient or instantaneous failure 131
U3 lllCheck operation not executed 133
U4 lllMalfunction of transmission between indoor units
and outdoor units
134
U5 lllMalfunction of transmission between remote
controller and indoor unit
136
U5 hkhFailure of remote controller P.C.B. or setting during
control by remote controller
136
U7 lllMalfunction of transmission between outdoor units —
U8 llhMalfunction of transmission between main and sub
remote controllers (malfunction of sub remote
controller)
137
UE lllMalfunction of transmission between centralized
remote controller and indoor unit
138
UF lllSystem is not set 140
UH lllMalfunction of system, refrigerant system address
undefined
141
Centralized
Remote
Controller
and
Schedule
Timer
UE lllMalfunction of transmission between centralized
remote controller and indoor unit
143
M1 k or hl lP.C.B. defect 145
M8 k or hl lMalfunction of transmission between optional
controllers for centralized control
146
MA k or hl lImproper combination of optional controllers for
centralized control
147
MC k or hl lAddress duplication, improper setting 149
Heat
Reclaim
Ventilation
64 khlIndoor unit’s air thermistor error —
65 khlOutside air thermistor error —
68 khlMalfunction of HVU —
6A khlDamper system alarm —
6A lllDamper system + thermistor error —
6F khlMalfunction of simple remote controller —
94 lllInternal transmission error —
k: ON h: OFF l: Blink
Malfunction
code
Operation
lamp
Inspection
display
Unit No. Malfunction contents Page
Referred
The system operates for malfunction codes indicated in gray squares, however, be sure to check and repair.