37We reserve the right to make technical changes | 83055600dUK – Translation of the original instruction manual (HMD 2) | ait-deutschland GmbH
No. Display Description Remedy
763 Sensor compressor intake Tü1 sensor error (compressor intake). Check sensor, replace if necessary.
764 Sensor compressor heater Sensor error compressor heater. Check sensor, replace if necessary.
765 Overheating Overheating longer than 5 minutes below 2K. When switching on for the rst time, check
rotary eld, otherwise phone customer
service.
766 compressor's functional
range
Operation for 5 minutes outside the compressor's functional
range.
Check rotary eld.
767 STB E-Rod STB of the heating element has been activated. Check the heating element and press the
fuse back in.
768 Flow monitoring Insucient ow in defrost cycle. Check hydraulics, check pump, check ow.
769 Pump control After 10 sec compressor runtime excessively low ow. Check PWM cable, check pump.
770 Low superheat Overheating lies below the limit value for a lengthy period. Check the temperature sensor, pressure
sensor and expansion valve.
771 High superheat Overheating lies below the limit value for a lengthy period. Check the temperature sensor, pressure
sensor, ll quantity and expansion valve.
776 limit of application-CP Compressor operates outside its use limits for a lengthy period. Check the thermodynamics.
777 Expansion valve Expansion valve is defective. Check the expansion valve, connection
cable and if applicable the SEC board.
778 Low pressure sensor Low-pressure sensor is defective. Check the sensor, connector and
connection cable.
779 High pressure sensor High-pressure sensor is defective. Check the sensor, connector and
connection cable.
780 EVI sensor EVI sensor is defective. Check the sensor, connector and
connection cable.
781 Liquid temp. sensor before
EXV
Liquid temperature sensor upstream of the ex-valve is
defective.
Check the sensor, connector and
connection cable.
782 Suction gas EVI temp.
sensor
Suction gas EVI temperature sensor is defective. Check the sensor, connector and
connection cable.
783 Communication SEC
board– Inverter
Connection between the SEC board and the inverter is
disrupted.
Check the connection cable, interference
suppression capacitors and wiring.
784 VSS lockdown Inverter is blocked. Disconnect the complete system from the
power supply for 2 minutes.
If it occurs again, check the inverter and
compressor.
785 SEC-Board defective Error found in the SEC board. Replace the SEC board.
786 Communication SEC
board– Inverter
Connection between SEC board and HZ/IO is disrupted by the
SEC board.
Check the HZ/IO – SEC board wiring.
787 VD alert Compressor signals faults. Acknowledge fault.
If an error occurs repeatedly, phone the
authorised service personnel (customer
service).
788 Major VSS fault Fault in the inverter. Check the inverter.
789 LIN/Encoding not found Control unit unable to nd coding. Either the LIN connection is
interrupted or the coding resistor is not detected.
Check the connection cable LIN / coding
resistor.
790 Major VSS fault Fault in the power supply of the inverter / compressor. Check the wiring, inverter and compressor.
791 ModBus Inverter The control panel has no ModBus communication with the
inverter for at least 10 seconds or 10 communication packets
to the inverter were lost. Reset automatically.
Check the Modbus wiring of inverter.
792 LIN-connection lost Unable to nd a master board or any conguration. Check the coding connector on the LIN
board(s).
793 Inverter Temperature Temperature sensor fault in the inverter. Internal inverter
temperature too high at least 5x within 24 h.
Fault acknowledges itself.
794 Overvoltage Overvoltage on inverter. Check the inverter voltage supply.
795 Undervoltage Undervoltage on inverter. Check the inverter voltage supply.
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