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15 Troubleshooting
Error code
Detailed error
code
CJ
02
EC
00
EC
04
H1
00
HC
00
HJ
11
U3
00
U4
00
U5
00
U6
36
U8
01
U8
02
U8
08
UA
00
UA
52
Installer reference guide
92
Description
Room temperature sensor
problem.
Please contact your dealer.
Abnormal increase tank
temperature.
Tank preheating
External temperature
sensor problem.
Please contact your dealer.
Tank temperature sensor
problem.
Please contact your dealer.
Boiler abnormality
detection
Check boiler
Refer to boiler manual
Under floor heating screed
dryout function not
completed
correctly.
Indoor/outdoor unit
communication problem.
User interface
communication problem.
Boiler standby abnormality
Check boiler
Refer to boiler manual
Connection with adapter
lost
Please contact your dealer.
Connection with room thermostat
lost
Boiler communication
malfunction
Indoor unit, outdoor unit
matching problem.
Power reset required.
Boiler, indoor unit
matching
problem.
Please contact your dealer.
See
"15.4.10 Symptom: Boiler/
hydrobox combination
abnormality (UA-52 error)" on
page 88
INFORMATION
Error AJ-03 is reset automatically from the moment there is
a normal tank heat-up.
INFORMATION
Error EC-04 is reset automatically from the moment the
domestic hot water tank is preheated to a sufficiently high
temperature.
INFORMATION
If the unit detects flow when the pump is not running, an
external device might be causing flow, or there might be
something wrong with the flow measuring devices (flow
sensor and flow switch).
▪ If the flow sensor detects flow when the pump is not
running, the unit will stop operation and the user
interface will display error C0‑00. For the unit to resume
operation, this error needs to be reset manually.
▪ If the flow switch detects flow when the pump is not
running, the unit will temporarily stop operation and the
user interface will display error C0‑01. After some time,
the error will reset automatically and the unit will
resume operation. If the problem persists, the unit will
stop operation and the user interface will display error
C0‑02. For the unit to resume operation, this error
needs to be reset manually.
Error codes of the gas boiler
The controller on the gas boiler detects faults and indicates them on
the display by error codes.
If the LED is flashing, the controller has detected a problem. Once
the problem is rectified, the controller can be restarted by pressing
the
button.
Following table shows a list of error codes and the possible
solutions.
Error
Cause
Possible solution
code
10, 11,
Sensor fault S1
▪ Check wiring
12, 13,
▪ Replace S1
14
20, 21,
Sensor fault S2
▪ Check wiring
22, 23,
▪ Replace S2
24
0
Sensor fault after
Replace S1 and/or S2
self-check
1
Temperature too
▪ Air in installation
high
▪ Pump is NOT running
▪ Insufficient flow in installation
▪ Radiators are closed
▪ Pump setting is too low
2
S1 and S2
▪ Check cable set
interchanged
▪ Replace S1 and S2
EJHA04AAV3 + NHY2KOMB28+32AA
Daikin Altherma H Hybrid
4P556861-1A – 2019.05
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