ESIE15-13B Field Setting from Outdoor Unit PCB
Field Setting 91
3.2.7 Troubleshooting
Error code
Troubleshooting
Description of error Description of diagnosis
U0 - 02
Gas shortage - Outdoor unit (Factor 0) This error results from a shortage of refrigerant. Refer to the
“U0” Troubleshooting flow chart and make a diagnosis, and
then take countermeasures.
U0 - 03
Gas shortage - Outdoor unit (Factor 1) This error results from a shortage of refrigerant cause by gas
leakage. Charge refrigerant up to the normal refrigerant
amount.
U0 - 04
Gas shortage - Outdoor unit (Factor 2) This error results from clogging caused somewhere in the
refrigerant piping system. Check for a failure to open the stop
valve and clogging in the refrigerant system.
U2 - 01
Power supply voltage error This error is supposed to have resulted from under- or over-
voltage of the power supply, or faulty voltage sensor in the PC
board.
U2 - 02
Open phase of power supply Check for any open phase of the power supply.
U2 - 03
Main circuit capacitor charge error There is abnormal circuit current flowing in the PC board. If
wire connections related to the PC board are normal, replace
the outdoor unit PC board.
U2 - 04
SP/MP-PAM overvoltage error There is overvoltage between SP/MP and PAM (single
phase). If wire connections related to the PC board are
normal, replace the outdoor unit PC board.
U2 - 35
AC voltage sensor error A failure of the power supply sensors was detected in the
circuit board. Refer to the “U2” Troubleshooting flow chart and
make a diagnosis for the PCB.
UA - 01
Incorrect number of indoor units connected This error will be displayed if the locally-set number of indoor
units is different from the detected number of indoor unit.
UA - 02
Multiple master units detected There are a number of indoor units with a remote controller
connected.
Connect the remote controller to only one indoor unit.
UA - 03
Excess indoor units connected This error will be displayed if five or more indoor units are
connected.
UA - 05
Indoor-Outdoor transmission error between
slave 1 and outdoor unit
There is an error in transmission between the outdoor unit and
slave indoor unit 1. Check for the connection of the jumper
between the slave indoor unit (with no remote controller
connected) and the outdoor unit.
UA - 07
Indoor-Outdoor transmission error between
slave 2 and outdoor unit
There is an error in transmission between the outdoor unit and
slave indoor unit 2. Check for the connection of the jumper
between the slave indoor unit (with no remote controller
connected) and the outdoor unit.
UA - 09
Indoor-Outdoor transmission error between
slave 3 and outdoor unit
There is an error in transmission between the outdoor unit and
slave indoor unit 3. Check for the connection of the jumper
between the slave indoor unit (with no remote controller
connected) and the outdoor unit.
UF - 01
Incorrect wiring There is an error in wire connections for transmission between
indoor and outdoor units (judged with the indoor unit). Check
for the connections of jumpers 1, 2 and 3 between the indoor
and outdoor units.
UF - 02
Piping connected the other way round There is an error in operation mode and refrigerant piping
detection temperature. Check for any refrigerant piping
connected the other way round, shortage of refrigerant, etc.
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