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We 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 first time, check
rotary field, otherwise phone customer
service.
766
compressor's functional
range
Operation for 5 minutes outside the compressor's functional
range.
Check rotary field.
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
Insufficient flow in defrost cycle.
Check hydraulics, check pump, check flow.
769
Pump control
After 10 sec compressor runtime excessively low flow.
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, fill 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 find 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 find a master board or any configuration.
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.
