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Check the inverter user panel and if there is any error, refer to inverter instruction manual.
Check cable connections.
Check the power motor. (mechanic and electric connections)
Check the network voltage.
Room Sensor Error
Check sensor cable connections.
Check cable connections between room control unit and control panel.
Check temperature sensor on the room unit.
Blow Sensor Error
Check sensor cable connections.
External Air Sensor Error
Check sensor cable connections.
Humidity Sensor Error
Check sensor cable connections.
Check sensor feeder voltage.
Freeze Error
Check warm water inlet and outlet temperatures belonging to the unit.
Check the dirt holder.
Check water pressure of the installation.
Evacuate air in the installation.
Check the three-way valve motor.
Check the three-way valve.
Check inlet and outlet valves.
Check cable connections of freeze thermostat, check setting values.
Front Air Filter Error
Check the front air filter.
Compressor 1 Low Pressure Error
Check gas pressures in this stage.
Check low pressure safety element.
Check exp. valve element.
Check filter within gas circuit.
Check valve positions on gas installation.
Check electric cable connections.
Check the set value of safety element.
Check cleanness of air filter within the device.
Check cleanness of evaporator surfaces.