Daikin Altherma 3 HT - Page 252

14 | Troubleshooting
Installer reference guide
252
EPRA14~18D + ETVH/X16S18+23E
Daikin Altherma 3 H HT F
4P644737-1A – 2022.03
Error code Description
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
U8-02 Connection with room thermostat lost
U8-03 No connection with room thermostat
U8-04 Unknown USB device
U8-05 File malfunction
U8-06 MMI/bizone kit communication problem
U8-07 P1P2 communication error
UA-00 Indoor unit, outdoor unit matching problem
UA-16 Extension/hydro communication problem
UA-17 Tank type problem
UA-21 Extension/hydro mismatch problem
UF-00 Reversed piping or bad communication wiring
detection.