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All Atlantic error codes

This page gathers Atlantic error codes sorted by failure type: what each code means, its likely causes, and what you can safely check before calling a professional.

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The Atlantic codes on this page, grouped by failure type.

temperature sensor

10 Flashes 13 13 Flashes 3 Flashes 33 4 Flashes 41 42 42 44 441 5 Flashes 50 6 Flashes 60 65 7 Flashes 73 73 74 74 75 76 77 78 82 83 84 86 9 Flashes 94 E3

general fault

105 121 122 127 22 Flashes 23 29 33 35 369 41 44 53 54 57 58 5U 63 65 68 77 94 A4 J2

compressor

12 Flashes 14 Flashes 15 Flashes 72 72 8 Flashes 84 95 95 A3 A3 E5

fan

16 Flashes 17 Flashes 39 51 59 5A 97 97 98 98 E6

communication

1 Flash 11 18 30 32 3A 62 6A

power supply

31 31 370 61 61 67 A9

discharge temperature

11 Flashes 2 Flashes 71 71 A1 A1

filtration

19 Flashes 55 64 64

low pressure

20 Flashes A5 A5

high pressure

86 A4 E8

power module

18 Flashes 63 65

circuit board

32 62

expansion valve

circuit pressure

backup heater element

reversing valve

Temperature sensor — Atlantic

These codes indicate a sensor that’s no longer returning a consistent value. The issue almost always comes from the sensor itself or its connector, rarely from the unit.

Code 10 FlashesInformationair-to-water

P.F.C. radiator temperature sensor error — diodes / LED

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 13Medium severityair-to-water

Condenser temperature sensor fault

Possible causes

Faulty condenser thermistor
Loose connection
Short circuit

What you can check

Turn off power for 30 min, then restart

Affected models: Alfea Excellia, Alfea Extensa

This issue requires a qualified technician. Do not open the unit.

Code 13 FlashesInformationair-to-water

Current sensor error (permanent shutdown). — diodes / LED

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 3 FlashesInformationair-to-water

Pressure switch sensor error. — diodes / LED

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 33Informationair-to-water

Heat pump outlet temperature sensor error.

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 4 FlashesInformationair-to-water

Heat exchanger outlet temperature sensor error. — diodes / LED

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 41Informationair-to-air

Room temperature sensor error

Affected models: Takao M2 wall-mounted R32

Code 42Informationair-to-water

Hydraulic module heat exchanger temperature sensor error. — outdoor unit – LED 4 Flashes / 2 Flashes

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 42Informationair-to-air

Outdoor unit heat exchanger average temperature sensor error

Affected models: Takao M2 wall-mounted R32

Code 44Informationair-to-water

Heat pump return temperature sensor error.

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 441Informationair-to-water

Zone 2 sensor not configured (if 2-circuit kit)

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 5 FlashesInformationair-to-water

Intermediate exchanger temperature sensor error. — diodes / LED

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 50Informationair-to-water

DHW temperature sensor.

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 6 FlashesInformationair-to-water

Expansion valve temperature sensor error. — diodes / LED

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 60Informationair-to-water

Room sensor 1.

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 65Informationair-to-water

Room sensor 2.

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 7 FlashesInformationair-to-water

Outdoor temperature sensor error. — diodes / LED

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 73Informationair-to-water

Exchanger temperature sensor error (outlet / center). — outdoor unit – LED 7 Flashes / 3 Flashes

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 73Informationair-to-air

Indoor unit heat exchanger liquid temperature sensor error

Affected models: Takao M2 wall-mounted R32

Code 74Informationair-to-water

Outdoor temperature sensor error. — outdoor unit – LED 7 Flashes / 4 Flashes

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 74Informationair-to-air

Outdoor temperature sensor error

Affected models: Takao M2 wall-mounted R32

Code 75Informationair-to-air

Suction gas temperature sensor error

Affected models: Takao M2 wall-mounted R32

Code 76Informationair-to-air

• 2-way valve temperature sensor error • 3-way valve temperature sensor error

Affected models: Takao M2 wall-mounted R32

Code 77Informationair-to-air

Cold source temperature sensor error

Affected models: Takao M2 wall-mounted R32

Code 78Informationair-to-water

Expansion valve temperature sensor error. — outdoor unit – LED 7 Flashes / 8 Flashes

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 82Informationair-to-air

• Subcooling heat exchanger gas inlet temperature sensor error • Subcooling heat exchanger gas outlet temperature sensor error

Affected models: Takao M2 wall-mounted R32

Code 83Informationair-to-air

Liquid pipe temperature sensor error

Affected models: Takao M2 wall-mounted R32

Code 84Informationair-to-air

Current sensor error

Affected models: Takao M2 wall-mounted R32

Code 86Informationair-to-water

Pressure switch sensor error / Pressure sensor error. — outdoor unit – LED 8 Flashes / 6 Flashes

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 9 FlashesInformationair-to-water

Inverter radiator temperature sensor error. — diodes / LED

Affected models: Alfea Excellia, Alfea Excellia Duo

This fault requires a qualified technician. Do not open the unit.

Code 94Informationair-to-water

Current sensor error. — outdoor unit – LED 9 Flashes / 4 Flashes

Affected models: Alfea Excellia, Alfea Excellia Duo

Code E3Medium severityair-to-air

Abnormal power supply (indoor unit)

Possible causes

Voltage below 198 V
Voltage above 264 V
Faulty electronic component

Affected models: Takao M2, Dojo, Nagano

This repair requires a qualified technician. Do not open the unit.

General fault — Atlantic

These codes don’t point to a specific part: the unit is signaling that an internal safety feature has been triggered.

Code 105Informationair-to-water

Maintenance message.

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 121Informationair-to-water

CC1 outlet temperature not reached.

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 122Informationair-to-water

CC2 outlet temperature not reached.

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 127Informationair-to-water

Anti-legionella temperature not reached.

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 22 FlashesInformationair-to-water

Hydraulic module fault. — diodes / LED

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 23Informationair-to-air

Combination error

Affected models: Takao M2 wall-mounted R32

This repair requires a qualified technician. Do not open the unit.

Code 29Informationair-to-air

Connected unit number error in the wired remote control configuration

Affected models: Takao M2 wall-mounted R32

Code 33Informationair-to-air

Error detecting indoor unit motor power consumption

Affected models: Takao M2 wall-mounted R32

Code 35Informationair-to-air

Manual/auto switch error

Affected models: Takao M2 wall-mounted R32

Code 369Informationair-to-water

External fault (safety device).

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 41Informationair-to-water

Connection error between the hydraulic module and the outdoor unit. — outdoor unit – LED 4 Flashes / 1 Flash

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 44Informationair-to-air

Presence sensor error

Affected models: Takao M2 wall-mounted R32

Code 53Informationair-to-air

Drain pump error

Affected models: Takao M2 wall-mounted R32

Code 54Informationair-to-air

Electric air purifier reverse VDD error

Affected models: Takao M2 wall-mounted R32

Code 57Informationair-to-air

Damper error

Affected models: Takao M2 wall-mounted R32

Code 58Informationair-to-air

Air intake grille error

Affected models: Takao M2 wall-mounted R32

Code 5UInformationair-to-air

Indoor unit error

Affected models: Takao M2 wall-mounted R32

Code 63Informationair-to-air

Inverter error

Affected models: Takao M2 wall-mounted R32

Code 65Informationair-to-air

L terminal tripping error

Affected models: Takao M2 wall-mounted R32

Code 68Informationair-to-water

Outdoor unit magnetic relay error. — outdoor unit – LED 6 Flashes / 8 Flashes

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 77Informationair-to-water

Outdoor unit radiator temperature error. — outdoor unit – LED 7 Flashes / 7 Flashes

Models concerned: Alfea Excellia, Alfea Excellia Duo

Code 94Informationair-to-air

Trip detection

Models concerned: Takao M2 wall-mounted R32

Code A4Informationair-to-water

Outdoor unit pressure error. — outdoor unit – LED 10 Flashes / 4 Flashes

Models concerned: Alfea Excellia, Alfea Excellia Duo

Code J2Informationair-to-air

Branch box error [Multi flexible]

Models concerned: Takao M2 wall-mounted R32

Compressor — Atlantic

The compressor is the most critical and most expensive part. These codes protect the unit by shutting it down before damage occurs: never force repeated restarts.

Code 12 FlashesInformationair-to-water

Compressor temperature protection (permanent shutdown). — diodes / LED

Models concerned: Alfea Excellia, Alfea Excellia Duo

This fault requires a qualified technician. Do not open the unit.

Code 14 FlashesInformationair-to-water

Compressor rotor position detection error (permanent shutdown). — diodes / LED

Models concerned: Alfea Excellia, Alfea Excellia Duo

This fault requires a qualified technician. Do not open the unit.

Code 15 FlashesInformationair-to-water

Compressor startup error (permanent shutdown). — diodes / LED

Models concerned: Alfea Excellia, Alfea Excellia Duo

This fault requires a qualified technician. Do not open the unit.

Code 72Informationair-to-water

Compressor temperature sensor error. — outdoor unit – LED 7 Flashes / 2 Flashes

Models concerned: Alfea Excellia, Alfea Excellia Duo

This fault requires a qualified technician. Do not open the unit.

Code 72Informationair-to-air

Compressor temperature sensor error

Models concerned: Takao M2 wall-mounted R32

Code 8 FlashesInformationair-to-water

Compressor temperature sensor error. — diodes / LED

Models concerned: Alfea Excellia, Alfea Excellia Duo

This fault requires a qualified technician. Do not open the unit.

Code 84Informationair-to-water

Compressor current error. — outdoor unit – LED 8 Flashes / 4 Flashes

Models concerned: Alfea Excellia, Alfea Excellia Duo

This fault requires a qualified technician. Do not open the unit.

Code 95Informationair-to-water

Compressor rotor position error detection. Compressor startup error. — outdoor unit – LED 9 Flashes / 5 Flashes

Models concerned: Alfea Excellia, Alfea Excellia Duo

This fault requires a qualified technician. Do not open the unit.

Code 95Informationair-to-air

Compressor rotor position detection error

Models concerned: Takao M2 wall-mounted R32

This fault requires a qualified technician. Do not open the unit.

Code A3Informationair-to-water

Compressor temperature protection. — outdoor unit – LED 10 Flashes / 3 Flashes

Models concerned: Alfea Excellia, Alfea Excellia Duo

This fault requires a qualified technician. Do not open the unit.

Code A3Informationair-to-air

Compressor temperature error

Models concerned: Takao M2 wall-mounted R32

This fault requires a qualified technician. Do not open the unit.

Code E5Critical severityair-to-air

Safety shutdown triggered by the indoor coil sensor

Possible causes

Clogged filter
Refrigerant leak
Dirty indoor coil

Models concerned: Takao M2, Dojo, Nagano

This fault requires a qualified technician. Do not open the unit.

Fan — Atlantic

The fan expels or draws in heat. If it’s blocked or faulty, pressure rises and triggers a shutdown.

Code 16 FlashesInformationair-to-water

Fan motor 1 error (permanent shutdown). — diodes / LED

Models concerned: Alfea Excellia, Alfea Excellia Duo

Code 17 FlashesInformationair-to-water

Fan motor 2 error (permanent shutdown). — diodes / LED

Models concerned: Alfea Excellia, Alfea Excellia Duo

Code 39Informationair-to-air

Indoor unit fan motor power supply error

Models concerned: Takao M2 wall-mounted R32

Code 51InformationAir-to-air

Indoor unit 1 fan motor error (Main fan)

Applicable models: Takao M2 wall-mounted R32

Code 59InformationAir-to-air

Indoor unit 2 fan motor error (Left-side fan)

Applicable models: Takao M2 wall-mounted R32

Code 5AInformationAir-to-air

Indoor unit 3 fan motor error (Right-side fan)

Applicable models: Takao M2 wall-mounted R32

Code 97InformationAir-to-water

Outdoor unit fan 1 error. — outdoor unit – LED 9 flashes / 7 flashes

Applicable models: Alfea Excellia, Alfea Excellia Duo

Code 97InformationAir-to-air

Outdoor unit fan motor error

Applicable models: Takao M2 wall-mounted R32

Code 98InformationAir-to-water

Outdoor unit fan 2 error. — outdoor unit – LED 9 flashes / 8 flashes

Applicable models: Alfea Excellia, Alfea Excellia Duo

Code 98InformationAir-to-air

Outdoor unit fan 2 motor error

Applicable models: Takao M2 wall-mounted R32

Code E6Medium severityAir-to-air

Phase reversal protection activated

Possible causes

Abnormal supply voltage
Incorrect electrical wiring
Faulty electronic board

Applicable models: Takao M2, Dojo, Nagano

This fault requires a qualified technician. Do not open the unit.

Communication — Atlantic

The indoor and outdoor units are no longer communicating. This is often due to the connecting cable or a circuit board, not the refrigerant circuit.

Code 1 FlashInformationAir-to-water

Serial communication feedback error. — diodes / LED

Applicable models: Alfea Excellia, Alfea Excellia Duo

Code 11InformationAir-to-air

Serial communication error

Applicable models: Takao M2 wall-mounted R32

This fault requires a qualified technician. Do not open the unit.

Code 18InformationAir-to-air

External communication error

Applicable models: Takao M2 wall-mounted R32

Code 30Medium severityAir-to-water

Communication fault between outdoor unit and controller

Possible causes

Communication cable between outdoor unit and controller
Electrical interference
Faulty controller board

What you can check

Check the wiring between the outdoor unit and the control panel
Turn off power for 30 minutes, then restart

Applicable models: Alfea Excellia, Alfea Extensa, Alfea M

This fault requires a qualified technician. Do not open the unit.

Code 32InformationAir-to-water

Communication error between the controller and the user interface. — outdoor unit – LED 3 flashes / 2 flashes

Applicable models: Alfea Excellia, Alfea Excellia Duo

Code 3AInformationAir-to-air

Communication circuit error between the indoor unit and wired remote control

Applicable models: Takao M2 wall-mounted R32

Code 62InformationAir-to-air

Outdoor unit main PCB model information error or communication error

Applicable models: Takao M2 wall-mounted R32

Code 6AInformationAir-to-air

Communication error between the display PCB microcomputers

Applicable models: Takao M2 wall-mounted R32

Power supply — Atlantic

The supply voltage is abnormal or missing. Check the dedicated circuit breaker first.

Code 31InformationAir-to-water

Hydraulic module power supply error. — outdoor unit – LED 3 flashes / 1 flash

Applicable models: Alfea Excellia, Alfea Excellia Duo

Code 31InformationAir-to-air

Power interruption error

Applicable models: Takao M2 wall-mounted R32

Code 370Informationair-to-water

Outdoor unit error (during a startup phase, see the “Commissioning” section).

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 61Informationair-to-water

Outdoor unit power supply error. — outdoor unit – LED 6 Flashes / 1 Flash

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 61Informationair-to-air

Wiring error, reversed or missing phases on the indoor unit

Affected models: Takao M2 wall-mounted R32

Code 67Informationair-to-water

Brief power outage to the outdoor unit (protection operation). — outdoor unit – LED 6 Flashes / 7 Flashes

Affected models: Alfea Excellia, Alfea Excellia Duo

Code A9Informationair-to-water

Overcurrent error. — outdoor unit – LED 10 Flashes / 9 Flashes

Affected models: Alfea Excellia, Alfea Excellia Duo

Discharge temperature — Atlantic

The compressor outlet temperature exceeds the safety threshold. This points to a refrigerant shortage or degraded heat exchange.

Code 11 FlashesInformationair-to-water

Discharge temperature protection (permanent shutdown). — diodes / LED

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 2 FlashesInformationair-to-water

Discharge temperature sensor error. — diodes / LED

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 71Informationair-to-water

Discharge temperature sensor error. — outdoor unit – LED 7 Flashes / 1 Flash

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 71Informationair-to-air

Discharge temperature sensor error

Affected models: Takao M2 wall-mounted R32

Code A1Informationair-to-water

Discharge temperature protection. — outdoor unit – LED 10 Flashes / 1 Flash

Affected models: Alfea Excellia, Alfea Excellia Duo

Code A1Informationair-to-air

Discharge temperature error

Affected models: Takao M2 wall-mounted R32

Filtration — Atlantic

Code 19 FlashesInformationair-to-water

Active filter error. — diodes / LED

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 55Informationair-to-air

Filter setting error

Affected models: Takao M2 wall-mounted R32

Code 64Informationair-to-water

Active filter error. — outdoor unit – LED 6 Flashes / 4 Flashes

Affected models: Alfea Excellia, Alfea Excellia Duo

Code 64Informationair-to-air

Active filter error and PFC error

Affected models: Takao M2 wall-mounted R32

Low pressure — Atlantic

The refrigerant circuit pressure is too low. This often indicates a refrigerant shortage, meaning a leak needs to be located.

Code 20 FlashesInformationair-to-water

Abnormal low pressure. — diodes / LED

Affected models: Alfea Excellia, Alfea Excellia Duo

This fault requires a qualified technician. Do not open the unit.

Code A5Informationair-to-water

Abnormal low pressure. — outdoor unit – LED 10 Flashes / 5 Flashes

Affected models: Alfea Excellia, Alfea Excellia Duo

This fault requires a qualified technician. Do not open the unit.

Code A5Informationair-to-air

Low pressure error

Affected models: Takao M2 wall-mounted R32

This fault requires a qualified technician. Do not open the unit.

High pressure — Atlantic

The refrigerant circuit pressure is too high. This is a safety feature: the unit shuts off before the compressor is damaged.

Code 86Informationair-to-air

• Discharge pressure sensor error • Suction pressure sensor error • High pressure switch error

Affected models: Takao M2 wall-mounted R32

This fault requires a qualified technician. Do not open the unit.

Code A4Informationair-to-air

High pressure error

Affected models: Takao M2 wall-mounted R32

This fault requires a qualified technician. Do not open the unit.

Code E8Critical severityair-to-air

Loss of communication between indoor unit / wired remote control (more than 4 min)

Possible causes

Damaged cable
Faulty indoor unit board
Defective wired remote control

Models affected: Takao M2, Dojo, Nagano

Power module — Atlantic

Code 18 FlashesInformationair-to-water

Inverter error. — diodes / LED

Models affected: Alfea Excellia, Alfea Excellia Duo

This fault requires a qualified technician. Do not open the unit.

Code 63Informationair-to-water

Inverter error. — outdoor unit – LED 6 Flashes / 3 Flashes

Models affected: Alfea Excellia, Alfea Excellia Duo

This fault requires a qualified technician. Do not open the unit.

Code 65Informationair-to-water

IPM board error. — outdoor unit – LED 6 Flashes / 5 Flashes

Models affected: Alfea Excellia, Alfea Excellia Duo

Electronic board — Atlantic

A control or power board is no longer responding. A full restart sometimes clears a false fault; otherwise a replacement is needed.

Code 32Informationair-to-air

Indoor unit PCB model information error

Models affected: Takao M2 wall-mounted R32

Code 62Informationair-to-water

Outdoor unit control board error. — outdoor unit – LED 6 Flashes / 2 Flashes

Models affected: Alfea Excellia, Alfea Excellia Duo

Expansion valve — Atlantic

The electronic expansion valve is no longer regulating refrigerant flow.

Code 9AInformationair-to-air

Expansion valve coil error

Models affected: Takao M2 wall-mounted R32

Circuit pressure — Atlantic

Code 28Medium severityair-to-water

Water pressure sensor fault (electronic pressure gauge)

Possible causes

Faulty water pressure sensor
Water pressure too low or too high
Faulty wiring

What you can check

Check the heating circuit pressure (1 to 2 bar)
Bleed the circuit if necessary
Cut power for 30 min, then restart

Models affected: Alfea Excellia, Alfea Extensa

Backup heater — Atlantic

Code 68Informationair-to-air

Outdoor unit current-limiting resistor temperature rise error

Models affected: Takao M2 wall-mounted R32

Reversing valve — Atlantic

Code 99Informationair-to-air

4-way valve error

Models affected: Takao M2 wall-mounted R32

All Atlantic codes published on the site

This list updates itself automatically with each new guide.

Technical information provided for guidance only, based on manufacturer documentation and field feedback. It does not replace a diagnosis by a qualified professional. Found an error on this page? Report it.