List of error codes for the Saunier Duval Genia Air Max air-to-water heat pump

> 43 °C. Cooling mode: > 46 °C.

< -20 °C. Cooling mode: < 15 °C.

enough heat.

the heat pump shuts off and the fault message F.741 is displayed. ► Check whether the domestic circuit provides enough heat.

an air pocket

2. Heating circuit pressure sensor faulty

4. Top up the water, bleed the circuit

5. Check the plug-in contact on the printed circuit board

and the cable harness

6. Check that the pressure sensor is working properly

7. Replace the pres- sure sensor

necessary.

– Replace the cable harness

– Replace the cable harness

– Replace the cable harness

– Replace the cable harness

– Replace the cable harness

– Replace the wiring harness

– Replace the wiring harness

replace it if necessary

– Replace the wiring harness

necessary

– Replace the wiring harness

replace it if necessary

– Replace the wiring harness

10 minutes, or compressor outlet temperature below -10°C while

the heat pump is operating within its characteristic curves.

– Check the EVD operation

– Check the condenser outlet temperature sensor (subcooling)

– Check that the 4-way valve is not in an intermediate position

– Check that there is no refrigerant overcharge

outdoor unit has tripped at a pressure of 41.5 bar (g) or 42.5 bar (abs)

– Insufficient amount of energy released by the condenser

– Insufficient flow rate due to closed regulators

in certain rooms on the underfloor heating system

– Check that the filter is not clogged

– Insufficient refrigerant flow (e.g. faulty electronic expansion valve,

mechanical blockage of the 4-way valve, clogged filter). Contact customer service.

– Cooling mode: check that the ventilation unit is not

dirty

– Check the high-pressure contactor and the high-pressure sensor

– Reset the high-pressure contactor and manually reset

the unit.

– Operating limits exceeded

– Expansion valve out of service or not opening correctly

– Insufficient amount of refrigerant (frequent defrosts due to

a very low evaporation temperature)

– Check the condenser outlet temperature sensor (TT135)

– Check the expansion valve (does it move all the way to the stop? Use the sensor/relay

test)

– Check the amount of refrigerant (see the technical

specifications)

– Perform a leak test

– Check that the outdoor unit’s service valves are open.

(heating mode), the energy input is low in the geothermal circuit (heating

mode) or the domestic circuit (cooling mode)

– Insufficient amount of refrigerant

check that they are properly suited to cooling mode (check the volumetric flow rate in cooling mode)

– Check that the fan module is not clogged with dirt

– Check the expansion valve (does it move all the way to the stop? Use the

sensor/relay test)

– Check the compressor inlet sensor

– Check the refrigerant charge level

operating range

– Insufficient refrigerant charge

sensor/relay test)

– Check the compressor inlet sensor

– Check the refrigerant charge level (see the technical

specifications)

– Check whether the 4-way valve is stuck in an intermediate position or not

reversing properly

– Check the high-pressure sensor

– Check the heating circuit pressure sensor

temperature (cooling mode) too high for the compressor to operate

– Excessive external heat input into the geothermal circuit

due to high fan speed

– Check that there is no refrigerant overcharge

– Check the expansion valve (does it move all the way to the stop? Use the

sensor/actuator test)

– Check the evaporation temperature sensor (depending on the position of

the 4-way valve)

– Check the volumetric flow rate in cooling mode

– Check the air flow rate in heating mode

or domestic circuit temperature (heating mode) too high for the compressor to operate

– Parasitic heat input into the domestic circuit

– Refrigerant circuit overfilled

– Insufficient flow in the domestic circuit

– Check the backup heater (is it heating while the sensor/relay

test parameter is set to Off?)

– Check the expansion valve (does it move all the way to the stop? Use the

sensor/relay test)

– Check the compressor outlet sensor, the condenser outlet

temperature sensor (TT135), and the high-pressure sensor

– Check that there is no refrigerant overcharge

– Check that the outdoor unit’s service valves are open.

– Check that the air flow rate is sufficient in cooling

mode

– Check the heating pump

– Check the domestic circuit flow rate

defrosting

minimum volume required and fit the installation with a return buffer tank in series if necessary

– The fault message remains displayed until the return

temperature rises back above 20 °C.

– Activate the electric backup heater on the product’s

control panel and in the management box to raise the return temperature. The compressor remains locked out as long as the fault message is displayed.

– Mains voltage outside the 70 V – 282 V range

compressor connection cables are intact

The male connectors must click into place.

– Check the cables

– Check the mains voltage

The mains voltage must be between 195 V and 253 V.

– Check the phases

– Replace the inverter if necessary

intact, properly in place, and replace them if necessary

– Test the inverter by operating the compressor safety

relay

– Read the inverter-related parameters and verify that

values are indeed displayed

flow temperature is lower than the heating circuit return temperature in heating mode.

– Incorrect temperature reading from the geothermal

circuit’s EVD temperature sensor.

click? Use the sensor/relay test)

– Check that the 4-way valve coil is correctly positioned

– Check the wiring harness and connectors

– Check the geothermal circuit’s EVD temperature sensor

– Replace the wiring harness

error (e.g. dry running, blockage, overvoltage, undervoltage); the pump has stopped and is locked out.

at least 30 seconds

– Check the plug-in connector on the PCB

– Check that the pump is operating correctly

– Bleed the heating circuit

– Check that the filter is not clogged

– Inverter fault

– Compressor connection cable faulty or loose

– Measure the inverter output between the 3 phases (must be

> 1 kΩ)

– Check the wiring harness and connectors

– Power cut by the utility provider

The mains voltage must be between 195 V and 253 V.

– Check the inverter’s air circuit

– Check that the fan is working properly

– The temperature exceeds the outdoor unit’s maximum

ambient temperature, which is 46 °C.

replace it if necessary

– Replace the pump

– Both of the heat pump’s flow temperature sensors

are faulty

– Replace the wiring harness

pump if the refrigerant circuit temperature gets too high. The heat pump attempts to restart after a waiting

period. A fault message appears after three

unsuccessful restart attempts.

– Max. refrigerant circuit temperature: 110 °C

– Waiting period: 5 min (after the first occurrence)

– Waiting period: 30 min (after the second occurrence and

each subsequent one)

– The fault counter is reset if both of the following

conditions are met:

– Heat demand with no prior shutdown

– 60 minutes of trouble-free operation

– Replace the refrigerant circuit strainer if necessary

Note

This can only occur if an intermediate heat exchanger

kit is fitted and activated.

The fault refers to the outdoor unit’s glycol water

pressure sensor.

an air pocket

– Faulty heating circuit pressure sensor

– Top off the water, bleed the circuit

– Check the plug-in contact on the printed circuit board

and the cable harness

– Check that the pressure sensor is working properly

– Replace the pressure sensor

connected or sensor input short-circuited

– Flow rate too low or air present in the heating circuit

– The heating element operating with the heating circuit

not full

– The heating element operating with a flow temperature

above 98 °C: the overheat protection’s fusible link has tripped; replacement

is required

– Parasitic heat input into the domestic circuit

– Open the isolation valves if necessary

– Replace the safety temperature limiter

– Reduce or eliminate the parasitic heat input

– Check that the filter is not clogged

– Faulty electrical connections

– Mains voltage too low

– Compressor power supply/off-peak rate not

connected

– Energy supplier lockout for more than three hours

– Check the electrical connections

– Check the voltage at the heat pump’s

electrical connection

– Reduce the energy supplier’s blocking period (cutoff time) to less than three hours

– Loose electrical connections

– Mains voltage too low

– Check the electrical connections

– Measure the voltage at the electric backup heater’s

electrical connection

– Outdoor unit not powered

and the controller’s printed circuit board on the indoor unit and the outdoor unit