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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
796
Safety switch off
Safety Input was triggered.
Case 1: Inverter malfunction.
Reset automatically
Case 2: High-pressure pressostats in refrigerating circuit have
triggered
Reset automatically
Case 3: Only LWDV malfunction message caused by voltage
fluctuations exceeding the valid standard.
Case 1: Check inverter.
Remedy fault.
Case 2: Check HW throughflow, overflow,
flow temperature sensor and high-
pressure sensor.
Remedy fault.
Case 3: It must be turned off and resecured
manually
797
MLRH is not supported
Heating rod regulating is not supported.
–
798
ModBus Fan
No ModBus communication with the fan for at least 10
seconds. Reset automatically.
Check ModBus – Fan wiring
799
ModBus ASB
No ModBus communication with the ASB board for at least 10
seconds. Reset automatically.
Check ModBus – ASB board wiring
800
Desuperheater-error
Shutdown is triggered when desuperheater temperature
≥ 80 ° C. Device is switched off and D0_Pause is written in
shutdowns.
Device is released again for operation after 2 hours.
If the shutdown occurs 5 times within 24 hours, error 800 is
written to the fault memory.
Remove energy from desuperheater
memory.
The machine can be restarted as soon as
the temperature falls < 80°C.
802
Switchbox fan
Shutdown will be triggered when temperature in the electrical
control box ≥ 80°C. If the temperature falls below 70°C, then
the heat pump will start up again. Reset automatically.
Check fan for correct function.
Check connection cable. Check sensor.
Check electrical control box openings for
blockages.
803
Switchbox fan
Error 802 tripped 3 times within 24 hours. Manual reset
required. If the temperature in the electrical switch box is still
≥ 80°C, the error will be triggered again immediately.
Check fan for correct function.
Check connection cable. Check sensor.
Check electrical control box openings for
blockages.
806
ModBus SEC
The SEC-board has no ModBus communication for at least 10
seconds or query has failed 10 times in a row.
Reset automatically.
Check ModBus – SEC board wiring.
807
Lost ModBus
communication
All possible ModBus communication faults with unit compo-
nents for the respective unit are present simultaneously for at
least 10 seconds. Reset automatically.
Check ModBus interface on the control
unit, connection cable to ModBus
distributor and ModBus distributor itself.
Check Modbus wiring.
