Daikin RMXS-L Series Service Manual page 150

Troubleshooting with LED
<Monitor mode>
Press the MODE (BS1) button and
enter the monitor mode.
<Selection of check item>
Press the SET (BS2) button and
select a check item according to the
LED pattern of No.14~16 and
No.20~22.
Refer to page 102 for check items.
<Confirmation of malfunction 1>
Press the RETURN (BS3) button
once to display the first digit of error
code.
<Confirmation of malfunction 2>
Press the SET (BS2) button once to
display the second digit of error
code.
<Confirmation of malfunction 3>
Press the SET (BS2) button once to
display the malfunction location.
<Confirmation of malfunction 4>
Press the SET (BS2) button once to
display the malfunction unit and the
malfunction location.
Press the RETURN (BS3) button
and return to the initial status of
monitor mode.
∗ If you become unsure of how to
proceed, press the MODE (BS1)
button and return to the setting
mode 1.
141
High voltage of capacitor in main
inverter circuit
Radiation fin thermistor abnormality
Low pressure drop due to refrigerant
shortage or electronic expansion valve
abnormality
Power supply insufficient or
instantaneous failure
Check operation is not conducted.
Transmission error between indoor
unit and BP unit
Transmission error between indoor
unit and outdoor unit in the same
system
Field setting switch abnormality or
Excessive number of indoor units
System abnormality, refrigerant
system address undefined
Detail
System is not set yet
description
on next
page.
Contents of malfunction
Imbalance of inverter power supply voltage
Faulty thermistor of inverter fin
Refrigerant shortage alarm
Insufficient Inverter voltage
Faulty charge of capacitor in main inverter circuit
Malfunction due to SP-PAM overvoltage
Malfunction due to P-N short circuit
I/O transmission error
I/O transmission error
Indoor unit system abnormal in other system
or other indoor unit system abnormal in own
system
System transmission malfunction
Overconnection malfunction of indoor units
Malfunction of field setting
Refrigerant abnormal
Connection error (BP unit)
Wiring error (Auto-address error)
Conflict in wiring and piping
SiUS181305E
Error
code
P1
P4
U0
U2
U3
U4
U9
UA
UH
UF
Troubleshooting