Control Elements And Displays; Alarm Display And Acknowledgement; Night Roller Blind/Unit Lighting - AHT CB 196 Manuel D'utilisation

AHT Cooling Systems GmbH

4.2. Control elements and displays

There are 2 buttons available as operating elements.
LED symbols (e.g.)
1
Fig. 3: Control elements and displays (symbolic represen-
tation)
No Control element
1
Button [1]
2
Button [2]
All other buttons on the display are not available to
the operator.
Display Meaning of display Meaning LED symbol
"On" Unit error free and
in operation (normal
operation)
"-d-" Defrosting
See → Chapter
Error
code* 4.2.1.

4.2.1. Alarm display and acknowledgement

Alarm display error code/buzzer:
The error code* is shown on the display and the LED
symbol appears.
Depending on the error, an acoustic signal is issued by an
installed buzzer.
For measures for fault resolution if alarm displays occur,
see → Chapter 9.3.
List of error codes (unit-specific):
Error code * Meaning
"OnF" Thermostat emergency operation
"noL" Control PCB defective
E00 Electronic expansion valve fault
E01 Suction pressure sensor fault
E02 Suction gas temperature sensor fault
(suction tube fault)
E03 Air inlet sensor fault
E04 Air outlet sensor fault
E05 Fin sensor fault
E_379425_1016
Display
Function
Temporary activation of day
mode
(night roller blind/unit
lighting)
See → Chapter 4.2.2
Alarm acknowledgement
Acoustic signal/buzzer
Light (day mode)
Night mode
Cooling mode
Evaporator fan
Defrosting
Alarm
E06 High-pressure sensor fault
E07 Compressor safety chain fault
E08 Hot gas temperature sensor fault
(pressure pipe fault)
E09
Inside temperature fault
(product compartment)
E10 Supply voltage too low/too high
E11 Low battery voltage
(see→ Chapter 10.2.3)
2
E12 Software class B (safety software) error
E13 EEPROM error (Control
PCB defective)
E32 Suction pressure too low
E33 Overheating too low
E34 Overheating too high
E35 Interior temperature (product compart-
ment) too high
E36 Interior temperature (product compart-
ment) too low
E37 Control temperature too low
E38 Control temperature too high
E39 Defrosting runtime error
E40 Internal memory error
E41
Hot gas temperature (pressure pipe sen-
sor) too high
E42 Time exceeded
Valve opening 100%
E43 Condensation pressure too high
E44 External alarm
Alarm acknowledgement
Acoustic signal/buzzer:
Press button [2].
Error code:
Cannot be acknowledged. It appears for as long as it
takes to remedy the fault.

4.2.2. Night roller blind/unit lighting

A control element (unit-specific) is available for opening the
night roller blind and switching on the unit lighting for night
mode see → Chapter 4.2 Fig. 3.
Open night roller blind and switch on unit lighting (tempor-
ary activation of day mode):
Press button [1] for at least 5 seconds.
Night roller blind closes again and unit lighting switches off:
Happens automatically after 30 minutes
31