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Troubleshooting
Installer reference guide
197
EPGA11~ EAV23DA6V
Daikin Altherma 3 H F
4P606487-1 – 2019.12
Error code
Detailed error code Description
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
UA
00
Indoor unit, outdoor unit
matching problem
UA
17
Tank type problem
UA
21
Extension/hydro mismatch
problem
UA
22
Communication problem between
control box and option box
UF
00
Trigger: Reversed piping or
bad communication wiring
detection Effect: Unit will
not start operation. Reset:
Manual reset