Carrier 38VS125C7SHQEE, Installation And Owner'S Manual, Page: 31 / 190

Failure codes
When there is no failure, if the start-up condition cannot be met, the digital tube on master unit will display stand-by code:
Indoor failure code list
Digital tube
indication on
master uni
t
Failure code
definition
Failure description Remarks
121
Power supply of
inverter board is
abnormal
Power supply of inverter board is broken suddenly
Thrice an hour,
confirm failure;
once confirmed,
non-resumable
122
Radiator
temp. sensor
of transducer
abnormal
Resistor of temp. sensor abnormal or temp.
sensor disconnected
123
Transient over
current in IPM
module rectifier
side hardware
Transient over current in IPM module rectifier side
hardware
555.
0
Standby state of
capacity overmatch
When the ratio of indoor horse power and outdoor horse
power is less than 50% or more than 130%, the system is in
standby mode.
Resumable
555.1 Outdoor ambient temperature
too high (heating)
Ta>27°C, Standby
555.3 Outdoor ambient temperature
too high or too low (cooling)
Ta>54°C or Ta<-15°C, Standby
Indication
on master
uni
t
Indication on
wired con-
troller
Flash times of LED5
on indoor PCB/timer
LED on remote re-
ceiver
Failure code definition
01 01 1 Indoor ambient temp. sensor Ta failure
02 02 2 Indoor coil temp. sensor Tc1 failure
03 03 3 Indoor coil temp. sensor Tc2 failure
04 04 4 Indoor TW sensor failure
05 05 5 Indoor EEPROM failure
06 06 6 Communication failure between indoor and outdoor unit
07 07 7 Communication failure between indoor and wired controller
08 08 8 Indoor drainage failure
09 09 9 Indoor repeated address
0A 0A 10 Indoor repeated central control address
Outdoor
failure
code
Outdoor
failure code 20 Outdoor corresponding failure
24
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