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76
Fault Codes
Error
Code
Contents Measure Product op. in
error condition
Error Type
Outdoor unit /
Comp. / Ind. unit
101
Indoor unit communica-
tion error
Check the communication cable of indoor
unit. Check the DC output voltage at the com-
munication terminal.
Operation o Communication
error
102
Indoor unit/outdoor unit
communication time-out
error: errors in more than
6 packets
Check the outdoor communication cable
connection. Check DC output voltag and the
communication terminal.
Operation o Communication
error
121
Indoor temperature sen-
sor (open/short error)
Check indoor unit room temperaute sensor.
Check indoor unit PCB connector CN41
(White)
Operation o Indoor sensor error
122
Indoor unit Eva in sensor
(Open/Short)
Check indoor unit pipe sensor. Check indoor
PCB connector CN41 (White)
Operation o Indoor sensor error
128
Indoor unit Eva in sensor
disconnection
Check the disconnection of indoor unit pipe
sensor.
Operation o Indoor sensor error
153
Indoor oating switch
secondary detection
Check indoor unit oat sensor. Check indoor
PCB connector CN5 (black)
Operation o Self diagnostic
error
202
Indoor/outdoor commu-
nication error (1 min)
Check the communication connection
between indoor and outdoor units. Check the
power line and communication cable connec-
tion status.
Operation o Communication
error
203
Communication error
between indoor/outdoor
INVIMAIN <-> MICOM
(1 min)
Check MAIN MICOM
Check INVERTER MICOM
Operation o Communication
error
221
Outdoor temperature
sensor error
Check sensor connection status
Check sensor location
Check sensor resistance
Operation o Outdoor sensor
error
237
COND temperature sen-
sor error
Check sensor connection status
Check sensor location
Check sensor resistance
Operation o Outdoor sensor
error
251
[Inverter] Emission tem-
perature sensor error
Check sensor connection status
Check sensor location
Check sensor resistance
Operation o Outdoor sensor
error
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