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12 Troubleshooting
Installer reference guide
80
EPGA11~ EAVH/9W
Daikin Altherma – Low temperature split
4P556070-1 – 2018.10
Error code
Detailed error
code
Description
E5
00
OU: Overheat of inverter
compressor motor
E6
00
OU: Compressor startup defect
E7
00
OU: Malfunction of outdoor unit
fan motor
E7
62
Brine flow abnormality
E8
00
OU: Power input overvoltage
E9
00
Malfunction of electronic
expansion valve
EA
00
OU: Cool/heat switchover
problem
EC
00
Abnormal increase tank
temperature
EC
04
Tank preheating
F3
00
OU: Malfunction of discharge
pipe temperature
F6
00
OU: Abnormal high pressure in
cooling
FA
00
OU: Abnormal high pressure,
actuation of HPS
H0
00
OU: Voltage/current sensor
problem
H0
01
Brine flow switch malfunction
H1
00
External temperature sensor
problem
H3
00
OU: Malfunction of high pressure
switch (HPS)
H4
00
Malfunction of low pressure
switch
H5
00
Malfunction of compressor
overload protection
H6
00
OU: Malfunction of position
detection sensor
H8
00
OU: Malfunction of compressor
input (CT) system
H9
00
OU: Malfunction of outdoor air
thermistor
HC
00
Tank temperature sensor
problem
HC
01
Second tank temperature sensor
problem
HJ
10
Water pressure sensor
abnormality
HJ
11
Boiler abnormality detection
HJ
12
Bypass valve turning error
J3
00
OU: Malfunction of discharge
pipe thermistor
J5
00
Malfunction of suction pipe
thermistor
J6
00
OU: Malfunction of heat
exchanger thermistor
J6
07
OU: Malfunction of heat
exchanger thermistor
J6
32
Leaving water temperature
thermistor Abnormality (outdoor
unit))
J6
33
Sensor communication error
J7
12
Brine inlet thermistor abnormality
Error code
Detailed error
code
Description
J8
00
Malfunction of refrigerant liquid
thermistor
J8
07
Brine outlet thermistor
abnormality
JA
00
OU: Malfunction of high pressure
sensor
JA
17
Refrigerant pressure sensor
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 t
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
Under floor heating screed dryout
function not completed correctly
U4
00
Indoor/outdoor unit
communication problem
U5
00
User interface communication
problem
U6
36
Boiler standby abnormality
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
06
Boiler communication error
U8
07
P1P2 communication error
U8
08
Boiler 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
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