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All Saunier Duval error codes

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

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

communication

002 003 031 032 033 034 035

general fault

F.582 Leak S.100 Standby the valve

temperature sensor

519 526 528

compressor

27 29

discharge temperature

28 517

low pressure

expansion valve

Communication — Saunier Duval

The indoor unit and outdoor unit have stopped talking to each other. It’s usually the connecting cable or a circuit board, not the refrigerant circuit.

Code 002Informationair-to-water

e-bus communication fault with the heat pump.

Affected models: Genia Air / Genia Hybrid

Code 003Informationair-to-water

e-bus communication fault with the hydraulic module.

Affected models: Genia Air / Genia Hybrid

Code 031Informationair-to-water

Communication fault with the wireless room thermostat for zone 2.

Affected models: Genia Air / Genia Hybrid

Code 032Informationair-to-water

Communication fault with the wireless room thermostat for zone 3.

Affected models: Genia Air / Genia Hybrid

Code 033Informationair-to-water

Communication fault with the wireless room thermostat for zone 4.

Affected models: Genia Air / Genia Hybrid

Code 034Informationair-to-water

Communication fault with the wireless room thermostat for zone 5.

Affected models: Genia Air / Genia Hybrid

Code 035Informationair-to-water

Communication fault with the wireless room thermostat for zone 6.

Affected models: Genia Air / Genia Hybrid

General fault — Saunier Duval

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

Code F.582Informationair-to-water

EVD fault

Possible causes

Expansion valve poorly connected or broken wire leading to the coil

What you can check

Check the connection guides and replace the expansion valve coil if needed

Affected models: Genia Set Max, Genia Air Max

Leak codeInformationair-to-water

Low glycol water level.

Affected models: Genia Air / Genia Hybrid

S.100 Standby codeInformationair-to-water

There’s no prior heating or cooling demand. Standby 0: outdoor unit. Standby 1: indoor unit

Affected models: Genia Set Max, Genia Air Max

Valve codeInformationair-to-water

Low water level.

Affected models: Genia Air 5

Temperature sensor — Saunier Duval

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 519Informationair-to-water

Heat pump circuit return temperature sensor fault.

Affected models: Genia Air / Genia Hybrid, Genia Air 5

Code 526Informationair-to-water

Evaporator/condenser sensor fault.

Affected models: Genia Air / Genia Hybrid, Genia Air 5

Code 528Informationair-to-water

Plate heat exchanger sensor fault.

Affected models: Genia Air / Genia Hybrid, Genia Air 5

Compressor — Saunier Duval

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 27Informationair-to-water

Compressor locked.

Affected models: Genia Air 6/8/12/15

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

Code 29Informationair-to-water

Compressor failure.

Models affected: Genia Air 6/8/12/15

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

Discharge temperature — Saunier Duval

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

Code 28Informationair-to-water

Compressor discharge temperature error.

Models affected: Genia Air 6/8/12/15

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

Code 517Informationair-to-water

Compressor discharge temperature sensor fault.

Models affected: Genia Air / Genia Hybrid, Genia Air 5

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

Low pressure — Saunier Duval

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

Code 30Informationair-to-water

Low-pressure switch.

Models affected: Genia Air 6/8/12/15

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

Expansion valve — Saunier Duval

The electronic expansion valve is no longer regulating refrigerant flow.

Code 31Informationair-to-water

Overpressure valve.

Models affected: Genia Air 6/8/12/15

All Saunier Duval codes published on the site

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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.