Daikin RMXS-L Series Service Manual page 164

Error Codes and Description
Error code
Outdoor L4 Radiation fin temperature rise
Unit
L5 Inverter compressor abnormality
L8 Inverter current abnormality
L9 Compressor start-up error
P1 High voltage of capacitor in main inverter circuit
P4 Radiation fin thermistor abnormality
System U0 Low pressure drop due to refrigerant shortage or
electronic expansion valve abnormality
U2 Power supply insufficient or instantaneous failure
U3 Check operation is not conducted.
U4 Signal transmission error between indoor unit and
Branch provider (BP) unit
U5 Signal transmission error between remote controller
and indoor unit
U8 Signal transmission error between MAIN remote
controller and SUB remote controller
System U9 Signal transmission error between indoor unit and
outdoor unit in the same system
UA Field setting abnormality
Excessive number of indoor units
UC Address duplication of central remote controller
UE Transmission error between centralized remote
controller and indoor unit
UF System is not set yet.
UH System abnormality, refrigerant system address
undefined
UJ Transmission error between outdoor unit and Branch
provider (BP) unit
The system keeps operating even though the error code is indicated, however, be sure to check and repair.
155
Description Reference page
RA Indoor SA Indoor BP Unit
Unit Unit
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SiUS181305E
Outdoor
Unit
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Troubleshooting