Troubleshooting by Remote Controller Si20-701_B
77
U0 - 03 Refrigerant shortage -
Outdoor unit (Factor 1)
This error results from a
refrigerant shortage cause by
gas leakage. Charge
refrigerant up to the normal
refrigerant amount.
U0 - 04 Refrigerant 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
overvoltage of the power
supply, or defective voltage
sensor in the PCB.
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 PCB. If
wire connections related to
the PCB are normal, replace
the outdoor unit PCB.
U2 - 04 SP/MP - PAM overvoltage
error
There is overvoltage between
SP/MP and PAM (Single
phase). If wire connections
related to the PCB are
normal, replace the outdoor
unit 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
5 or more indoor units are
connected.
Error code
Troubleshooting
Description of error Description of diagnosis
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