14 | Troubleshooting
Installer reference guide
255
EPRA08~12EAV3+W1 + ETVH12SU18+23EA6V
Daikin Altherma 3 H MT F
4P644482-1 – 2021.03
Error code Description
81-06 Entering water temperature thermistor
abnormality (indoor unit)
89-01 Heat exchanger freeze-up protection activated
during defrost (error)
89-02 Heat exchanger freeze-up protection activated
during heating / DHW
89-03 Heat exchanger freeze-up protection activated
during defrost (warning)
89-05 Heat exchanger freeze-up protection activated
during cooling (error)
89-06 Heat exchanger freeze-up protection activated
during defrost (warning)
8F-00 Abnormal increase outlet water temperature
(DHW)
8H-00 Abnormal increase outlet water temperature
8H-01 Overheating mixed water circuit
8H-02 Overheating mixed water circuit (thermostat)
8H-03 Overheating water circuit (thermostat)
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
AC-00 Booster heater overheated
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 switch malfunction
C0-02 Flow switch 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)
E3-24 High pressure switch abnormality
E4-00 Abnormal suction pressure
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