Daikin ETSX16E Installer's Reference Manual page 261

EPRA14~18D + ETSH/X(B)16P30+50E
Daikin Altherma 3 H HT ECH₂O
4P679467-1D – 2023.11
Error code
81-06 Entering water temperature thermistor
abnormality (indoor unit)
81-07 Mixed leaving water temperature after the tank
thermistor abnormality (DLWA2)
89-01 Heat exchanger freeze-up protection activated
during defrost (error)
89-02 Heat exchanger freeze-up protection activated
during heating / DHW operation. (warning)
89-03 Heat exchanger freeze-up protection activated
during defrost (warning)
89-05 Heat exchanger freeze-up protection activated
during cooling operation. (error)
89-06 Heat exchanger freeze-up protection activated
during cooling operation. (warning)
8F-00 Abnormal increase outlet water temperature
(DHW)
8H-00 Abnormal increase outlet water temperature
8H-01 Overheating/undercooling mixed water circuit
8H-02 Overheating mixed water circuit (thermostat)
8H-03 Overheating water circuit (thermostat)
8H-08 Overheating water circuit
A1-00 Zero cross detection problem
A5-00 OU: High pressure peak cut / freeze protection
problem
AA-01 Backup heater overheated or BUH power cable
not connected
AH-00 Tank disinfection function not completed
correctly
AJ-03 Too long DHW heat-up time required
C0-00 Flow sensor malfunction
C0-01 Flow sensor malfunction
C0-02 Flow sensor malfunction
C4-00 Heat exchanger temperature sensor problem
C5-00 Heat exchanger thermistor abnormality
CJ-02
Room temperature sensor problem
E1-00
OU: PCB defect
E2-00 Leakage current detection error
E3-00 OU: Actuation of high pressure switch (HPS)
14 Troubleshooting
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Description
Installer reference guide
261