List of error codes for the Saunier Duval Genia Set 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. Faulty heating circuit pressure sensor

4. Add water to the circuit and bleed it

5. Check the plug-in connector on the PCB

and the wiring harness

6. Check that the pressure sensor is working properly

7. Replace the pressure sensor

necessary.

– Replace the wiring harness

– Replace the wiring harness

– Replace the wiring harness

– Replace the wiring harness

– Replace the wiring 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 performance curves.

– Check the EVD operation

– Check the condenser outlet temperature sensor (subcooling)

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

– Check that there is no refrigerant overcharge

at a pressure of 41.5 bar (g) or 42.5 bar (abs)

– Insufficient amount of energy emitted by the condenser

– Insufficient volumetric flow due to the closing of the 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 properly

– Insufficient amount of refrigerant (frequent defrosting 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 its stop? Use the sensor/relay test)

– Check the refrigerant amount (see 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 suitable for cooling mode (check the volumetric flow in cooling mode)

– Check that the fan module is not dirty

– Check the expansion valve (does it travel 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 technical

specifications)

– Check whether the 4-way valve is stuck in an intermediate position or is

not switching correctly

– 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 travel 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 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 overcharged

– 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 travel 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 circulator pump

– Check the domestic circuit flow

defrosting

minimum required volume and fit the system with a return buffer tank in series if neces- sary

– The fault message remains displayed until the return

temperature rises back above 20 °C.

– Activate the electric backup heater on the unit’s

control panel and in the control 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 undamaged

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 converter if neces- sary

controller’s circuit board

undamaged, properly seated, and replace them if necessary

– Test the converter by operating the compressor safety

relay

– Read the parameters associated with the converter and check that

values are actually displayed

than the heating circuit return temperature in heating mode.

– Incorrect temperature reading from the EVD temperature sensor of the

geothermal circuit.

Use the sensor/relay test)

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

– Check the wiring harness and connectors

– Check the EVD temperature sensor of the geothermal circuit

– Replace the cable harness

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

30 seconds

– Check the plug-in connector on the

printed circuit board

– Check that the pump is working

properly

– Bleed the heating circuit

– Check that the filter is not clogged

– Inverter fault

– Compressor connection cable faulty

or loose

resistance

– Measure the inverter output between

the 3 phases (should be

> 1 kΩ)

– Check the wiring harness and the

connectors

operation

– Power cut by the utility provider

correct it if necessary

The mains voltage must be between

195 V and 253 V.

restart the unit

– Check the inverter’s air circuit

– Check that the fan is working

properly

– The temperature exceeds the

maximum ambient temperature of

the outdoor unit, which is 46°C.

back to the heat pump

not faulty and replace it if necessary

– Replace the pump

input short-circuited

– Both of the heat pump’s outlet

temperature sensors are faulty

necessary

– Replace the wiring harness

shut off the heat pump if the

temperature of the refrigerant circuit

is 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 resets if both of

the following conditions are met:

– Heat demand without a prior

shutdown

– Undisturbed operation for

60 min

– Replace the refrigerant circuit

strainer if necessary

Note

Can only occur when an intermediate

heat exchanger kit is installed 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 while the heating circuit

is not full

– The heating element operating with a flow temperature

above 98 °C: this trips the overheat safety fuse; replacement

is required

– Unwanted heat input into the domestic circuit

– Open the isolation valves if necessary

– Replace the safety temperature limiter

– Reduce or eliminate the unwanted heat input

– Check that the filter is not clogged

– Faulty electrical connections

– Mains voltage too low

– Compressor power supply/off-peak rate not con-

nected

– Energy supplier lockout lasting more than three hours

– Check the electrical connections

– Check the voltage at the heat pump’s

electrical connection

– Reduce the energy supplier’s lockout 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

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