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Daikin Altherma fault codes

77 codes from the Daikin manual for the Altherma heat pump. Pick one for what it means, the likely causes and where to start.

CodeWhat it means
4-02Incorrect setting of space heating OFF temperature
7HFlow error (minimum flow rate not reached)
7H-01Water flow problem
7H-04Water flow problem during domestic hot water production
7H-05Water flow problem during heating/sampling
7H-06Water flow during cooling/defrost
7H-07Water flow problem. pump de-blocking active
7H-XXWater flow or volume too low
80-00Inlet water thermistor abnormality
81-00Outlet water thermistor abnormality
81-01Mixed water thermistor abnormality
89-01Heat exchanger frozen
89-02Heat exchanger frozen
89-03Heat exchanger frozen
8F-00Abnormal increase outlet water temperature (domestic hot water)
8H-00Abnormal increase outlet water temperature
8H-01Overheating mixed water circuit
8H-02Overheating mixed water circuit (thermostat)
8H-03Safety thermostat circuit open with jumper removed
A1-00Zero cross detection problem
A5-00Outdoor unit: high pressure peak cut / freeze protection problem
AA-01Backup heater overheated
AA-02External backup heater overheated
AC-00Booster heater overheated
AH-00Tank disinfection function not completed correctly
AJ-03Too long domestic hot water heat-up time required
C0-00Flow sensor malfunction
C0-01Flow switch malfunction
C0-02Flow switch malfunction
C-07Incorrect setting of unit control method
C4-00Heat exchanger temperature sensor problem
CJ-02Room temperature sensor problem
E1-00Outdoor unit: PCB defect
E3-00Outdoor unit: actuation of high pressure switch
E5-00Outdoor unit: overheat of inverter compressor motor
E6-00Outdoor unit: compressor startup defect
E7-00Outdoor unit: malfunction of outdoor unit fan motor
E8-00Outdoor unit: power input overvoltage
EA-00Outdoor unit: cool/heat switchover problem
EC-00Abnormal increase tank temperature
EC-04Tank preheating
F-01Incorrect setting of space cooling OFF temperature
F3-00Outdoor unit: malfunction of discharge pipe temperature
F6-00Outdoor unit: abnormal high pressure in cooling
FA-00Outdoor unit: abnormal high pressure, actuation of high pressure switch
H0-00Outdoor unit: voltage/current sensor problem
H1-00External temperature sensor problem
H3-00Outdoor unit: malfunction of high pressure switch
H6-00Outdoor unit: malfunction of position detection sensor
H8-00Outdoor unit: malfunction of compressor input system
H9-00Outdoor unit: malfunction of outdoor air thermistor
HA-00Outdoor heat exchanger sensor malfunction
HC-00Tank temperature sensor problem
HC-01Second tank temperature sensor problem
HJ-10Water pressure sensor abnormality
J3-00Outdoor unit: malfunction of discharge pipe thermistor
J6-00Outdoor unit: malfunction of heat exchanger thermistor
J6-07Outdoor unit: malfunction of heat exchanger thermistor
JA-00Malfunction of high pressure sensor
JA-17Refrigerant pressure sensor abnormality
L3-00Outdoor unit: electrical box temperature rise problem
L4-00Outdoor unit: malfunction of inverter radiating fin temperature rise
L5-00Outdoor unit: inverter instantaneous overcurrent
U0-00Outdoor unit: shortage of refrigerant
U2-00Outdoor unit: defect of power supply voltage
U3-00Under floor heating screed dry out function not completed correctly
U4-00Indoor/outdoor unit communication problem
U5-00User interface communication problem
U7-00Outdoor unit: transmission malfunction between main microcomputer - inverter microcomputer
U8-01Connection with LAN adapter lost
U8-02Connection with room thermostat lost
U8-03No connection with room thermostat
UA-00Indoor unit, outdoor unit mismatching problem
UA-16Bizone/hydro communication problem
UA-17Tank type problem
UA-21Bizone PCB / hydro PCB mismatch error
UA-22Communication problem between control box and option box