Home › Brands › Chaffoteaux

All Chaffoteaux error codes

This page brings together Chaffoteaux error codes sorted by type of fault: what each code means, its likely causes, and what you can safely check before calling a professional.

Can’t find your Chaffoteaux code in the list?

Describe your issue to Cody. It identifies the code, tells you what’s happening, and what you can check yourself. If it doesn’t know the code, it looks it up in the manufacturer’s documentation.

Ask Cody ›

Find your code quickly

The Chaffoteaux codes on this page, grouped by type of fault.

power supply

10 11 12 43 44 45 46 47 48 5 50 7 22 7 23 8 9 950 951

temperature sensor

51 7 01 7 02 7 03 7 11 7 12 7 13 911 913 914 916 948 949 952

compressor

18 2 3 4 40 41 49 6 905 906 953

communication

13 15 16 38 52 53 915

general fault

2 4 9 38 917 922 954 HP POWER OFF

fan

21 27 29 909 957

power module

17 39 42 931

reversing valve

907 912 947

low pressure

36 918

circuit board

1 14

high pressure

condensate drain

water flow

expansion valve

discharge temperature

Power Supply — Chaffoteaux

The supply voltage is abnormal or absent. First, check the dedicated circuit breaker.

Code 10Informationair-to-water

Low AC supply voltage — Inverter board

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 11Informationair-to-water

Supply current overload — Inverter board

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 12Informationair-to-water

Supply voltage measurement error — Inverter board

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 43Informationair-to-water

Heat sink overheating — Inverter board

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

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

Code 44Informationair-to-water

Low DC bus voltage at startup — Inverter board

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 45Informationair-to-water

DC bus overvoltage — Inverter board

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 46Informationair-to-water

Low DC bus voltage — Inverter board

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 47Informationair-to-water

Low AC supply voltage — Inverter board

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 48Informationair-to-water

AC supply overvoltage — Inverter board

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 5Informationair-to-water

AC supply phase fault — Inverter board

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 50Informationair-to-water

CETTE supply voltage measurement error — Inverter board

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 7 22Informationair-to-water

Zone 2 overheating

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

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

Code 7 23Informationair-to-water

Zone 3 overheating

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

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

Code 8Informationair-to-water

DC bus overvoltage — Inverter board

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 9Informationair-to-water

Low DC bus voltage — Inverter board

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 950Informationair-to-water

TD overheat error. Perform a reset. — TDM (hydraulic module)

Models concerned: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

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

Code 951Informationair-to-water

TD overheat error — TDM (hydraulic module)

Models concerned: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

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

Temperature sensor — Chaffoteaux

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

Code 51Informationair-to-water

Heat sink temperature sensor error — Inverter board

Models concerned: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 7 01Informationair-to-water

Zone 1 flow sensor fault

Models concerned: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 7 02Informationair-to-water

Zone 2 flow sensor fault

Models concerned: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 7 03Informationair-to-water

Zone 3 flow sensor fault

Models concerned: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 7 11Informationair-to-water

Zone 1 return sensor fault

Models concerned: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 7 12Informationair-to-water

Zone 2 return sensor fault

Models concerned: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 7 13Informationair-to-water

Zone 3 return sensor fault

Models concerned: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 911Informationair-to-water

TE Sensor error — TDM (hydraulic module)

Models concerned: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 913Informationair-to-water

LWT Sensor error — TDM (hydraulic module)

Models concerned: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 914Informationair-to-water

TR Sensor error — TDM (hydraulic module)

Models concerned: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 916Informationair-to-water

TEO Sensor error — TDM (hydraulic module)

Models concerned: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 948Informationair-to-water

TD Sensor error — TDM (hydraulic module)

Models concerned: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 949Informationair-to-water

TS Sensor error — TDM (hydraulic module)

Models concerned: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 952Informationair-to-water

TO Sensor error — TDM (hydraulic module)

Models concerned: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Compressor — Chaffoteaux

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

Code 18Informationair-to-water

Compressor type error — Inverter board

Models concerned: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

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

Code 2Informationair-to-water

Compressor IPM overcurrent — Inverter board

Models concerned: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

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

Code 3Informationair-to-water

Fault in the compressor startup sequence — Inverter board

Models concerned: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

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

Code 4Informationair-to-water

Compressor current overcurrent — Inverter board

Models concerned: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

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

Code 40Informationair-to-water

Compressor startup failure — Inverter board

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

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

Code 41Informationair-to-water

Compressor current overload — Inverter board

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

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

Code 49Informationair-to-water

compressor emergency shutdown — Inverter board

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

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

Code 6Informationair-to-water

Measurement error on IPM Compressor current — Inverter board

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 905Informationair-to-water

Compressor Control Error — TDM (hydraulic module)

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

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

Code 906Informationair-to-water

Compressor Control Error — TDM (hydraulic module)

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

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

Code 953Informationair-to-water

Compressor oil heater control error — TDM (hydraulic module)

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

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

Communication — Chaffoteaux

The indoor unit and outdoor unit have lost communication. It’s usually the connecting cable or a board, not the refrigerant circuit.

Code 13Informationair-to-water

Communication error with the board’s microprocessor — Inverter board

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 15Informationair-to-water

Internal communication error between the board’s microcontrollers — Inverter board

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 16Informationair-to-water

Communication error between the INVERTER board and the TDM board — Inverter board

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

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

Code 38Informationair-to-water

Communication error on the INVERTER board — Inverter board

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

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

Code 52Informationair-to-water

Internal communication error between the board’s microcontrollers — Inverter board

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 53Informationair-to-water

Communication error with the IDU control board — Inverter board

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 915Informationair-to-water

TDM communication error — TDM (hydraulic module)

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

General fault — Chaffoteaux

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

Code 2Informationair-to-water

What you can check

Smart Grid Inputs Config. Error incomplete

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 4Informationair-to-water

20*

What you can check

BUS power supply overload

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 9 38Informationair-to-water

Anode fault

What you can check

Check the anode connection
Check that there is water in the tank
Check the condition of the anode

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 917Informationair-to-water

“Heat pump icing: LWT and/or TR temperature too low. Perform a reset.” — TDM (hydraulic module)

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 922Informationair-to-water

Heat pump icing — TDM (hydraulic module)

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 954Informationair-to-water

Outdoor unit heating cord control error — TDM (hydraulic module)

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code HP POWER OFFInformationair-to-water

SERVICE RESET — TDM (hydraulic module)

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Fan — Chaffoteaux

The fan releases or captures heat. If it’s blocked or faulty, pressure rises and triggers a shutdown.

Code 21Informationair-to-water

Fan 1 startup failure — Inverter board

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 27Informationair-to-water

Fan 1 control error — Inverter board

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 29Informationair-to-water

Fan 2 startup failure — Inverter board

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 909Informationair-to-water

Fan stopped while unit is running — TDM (hydraulic module)

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 957Informationair-to-water

Heat pump fan type configuration error — TDM (hydraulic module)

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Power module — Chaffoteaux

Code 17Informationair-to-water

IPM module overheating — Inverter board

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

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

Code 39Informationair-to-water

IPM overcurrent — Inverter board

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 42Informationair-to-water

IPM current measurement error — Inverter board

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 931Informationair-to-water

Inverter error — TDM (hydraulic module)

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

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

Reversing valve — Chaffoteaux

Code 907Informationair-to-water

4-way valve control error — TDM (hydraulic module)

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 912Informationair-to-water

4-way valve error. Turn off the system to acknowledge the fault — TDM (hydraulic module)

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 947Informationair-to-water

4-way valve error — TDM (hydraulic module)

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Low pressure — Chaffoteaux

The refrigerant circuit pressure is too low. This often indicates a refrigerant shortage, meaning there’s a leak to locate.

Code 36Informationair-to-water

Low-pressure switch protection (shunt on the board) — Inverter board

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

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

Code 918Informationair-to-water

Refrigerant recovery cycle error — TDM (hydraulic module)

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

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

Electronic board — Chaffoteaux

A control or power board is no longer responding. A full restart sometimes clears a false fault; otherwise, it needs to be replaced.

Code 1Informationair-to-water

Heat sink overheating (INVERTER board) — Inverter board

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

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

Code 14Informationair-to-water

INVERTER board heat sink temperature sensor error — Inverter board

Affected models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

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

High pressure — Chaffoteaux

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

Code 19Informationair-to-water

High-pressure protection — Inverter board

Applicable models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

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

Code 35Informationair-to-water

High-pressure switch protection (jumper on the board) — Inverter board

Applicable models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

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

Condensate drainage — Chaffoteaux

Code 7Informationair-to-water

Capacitor charging fault — Inverter board

Applicable models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Code 919Informationair-to-water

Condensing temperature too high error — TDM (hydraulic module)

Applicable models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Water flow — Chaffoteaux

The water flow in the heating circuit is insufficient. The usual suspects are the circulator pump, filter, valves, and air in the system.

Code 956Informationair-to-water

Insufficient flow error — TDM (hydraulic module)

Applicable models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Expansion valve — Chaffoteaux

The electronic expansion valve is no longer regulating the refrigerant flow.

Code 908Informationair-to-water

Gas expansion valve control error — TDM (hydraulic module)

Applicable models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

Discharge temperature — Chaffoteaux

The compressor outlet temperature exceeds the safety threshold. This points to low refrigerant charge or poor heat exchange.

Code 37Informationair-to-water

Compressor overheat thermostat protection (jumper on the board) — Inverter board

Applicable models: Arianext Compact M, Arianext Compact S, Arianext Flex M, Arianext Plus M, Arianext Flex S, Arianext Plus S

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

All Chaffoteaux codes published on the site

This list updates automatically whenever a new guide is added.

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