Si33-105 Troubleshooting by Remote Controller
Troubleshooting R407C PLUS Series Heat Recovery System 155
Outdoor
Unit
J6 999Malfunction of thermistor (R2T) for heat exchanger
(loose connection, disconnection, short circuit,
failure)
178
J6 879Malfunction of thermistor (R2T) for heat exchanger
(loose connection, disconnection, short circuit,
failure)
178
JA 999Malfunction of discharge pipe pressure sensor 179
JC 999Malfunction of suction pipe pressure sensor 180
JH 879Malfunction of oil temperature sensor —
L0 999Failure of inverter system —
L4 999Malfunction of inverter radiating fin temperature rise 195
L5 999Inverter instantaneous over-current 196
L6 999Compressor motor insulation defect, short circuit —
L8 999Inverter thermostat sensor, Compressor overload 197
L9 999Inverter stall prevention, Compressor lock 198
LA 999Malfunction of power unit —
LC 999Malfunction of transmission between inverter and
control PC board
199
System
P0 979Gas depletion (heat build up) —
P1 999Inverter over-ripple protection 202
P4 999Malfunction of inverter radiating fin temperature
sensor
203
U0 879Low pressure drop due to refrigerant shortage or
electronic expansion valve failure
181
U1 999Negative phase / open phase 182
U2 999Power supply insufficient or instantaneous failure 201
U4 999Malfunction of transmission between indoor unit 183
U5 999Malfunction of transmission between remote
controller and indoor unit
184
U5 787Failure of remote controller PC board or setting
during control by remote controller
—
U7 999Malfunction of transmission between indoor units
Malfunction of transmission between outdoor units,
malfunction of transmission between outdoor unit and
ice build-up heat unit
—
U7 879Malfunction of transmission between outdoor units
(cool/heat unified, low noise)
185
U8 997Malfunction of transmission between master and
slave remote controllers (malfunction of slave remote
controller)
186
U9 999Malfunction of transmission between indoor unit and
outdoor unit in same system
187
UA 999Excessive number of indoor units 188
UC 888Address duplication of central remote controller 190
UE 999Malfunction of transmission between indoor unit and
central remote controller
204
UF 999Refrigerant system not set, incompatible wiring /
piping
191
UH 999Malfunction of system, refrigerant system address
undefined
192
The system operates for malfunction codes indicated in black squares, however, be sure to check and repair.
Malfunction
code
Operation
lamp
Inspection
display
Unit No. Malfunction contents
Page
Refered
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