15 | Troubleshooting
Installer reference guide
206
EWAA011~016DA + EWYA009~016DA
Packaged air-cooled water chillers
and packaged air to water heat pumps
4P620242-1 – 2020.06
Error code Description
JA-00 OU: Malfunction of high pressure sensor
JC-00 Low pressure sensor abnormality
JC-01 Evaporator pressure abnormality
L1-00 Malfunction of INV PCB
L3-00 OU: Electrical box temperature rise problem
L4-00 OU: Malfunction of inverter radiating fin
temperature rise
L5-00 OU: Inverter instantaneous overcurrent (DC)
L8-00 Malfunction triggered by a thermal protection
in the inverter PCB
L9-00 Prevention of compressor lock
LC-00 Malfunction in communication system of outdoor
unit
P1-00 Open-phase power supply imbalance
P3-00 Abnormal direct current
P4-00 OU: Malfunction of radiating fin temperature
sensor
PJ-00 Capacity setting mismatch
U0-00 OU: Shortage of refrigerant
U1-00 Malfunction by reverse phase/open-phase
U2-00 OU: Defect of power supply voltage
U3-00 Underfloor heating screed dryout function not
completed correctly
U4-00 Indoor/outdoor unit communication problem
U5-00 User interface communication problem
U7-00 OU: Transmission malfunction between main CPU-
INV CPU
U8-01 Connection with LAN adapter lost
U8-02 Connection with room thermostat lost
U8-03 No connection with room thermostat
U8-04 Unknown USB device
U8-05 File malfunction
U8-07 P1P2 communication error
U8-11 Connection with the Wireless gateway lost
UA-00 Indoor unit, outdoor unit matching problem
UA-16 Extension/hydro communication problem
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