Rittal SK 3302.series Assembly And Operating Instructions Manual page 31

Display System message
screen
A01 Enclosure door open
A02 Internal temperature
of enclosure too high
A03 Filter monitoring
A04 Ambient temperature
too high/too low
A05 Icing hazard
H
A06 PSA pressure-operated
switch
A07 Evaporator coil
A08 Condensate warning
A09 Condenser fan
A10 Evaporator fan
A11 Compressor
A12 Condenser temperature
sensor
A13 Ambient temperature
sensor
A14 Icing temperature sensor
A15 Condensate warning
temperature sensor
A16 Internal temperature sensor Open or short-circuit
A17 Phase monitoring
A18 EPROM error
A19 LAN/Master-Slave
A20 Voltage drop
E0 Display message
OL Overload
LH Low heat
rSt Reset
Tab. 6: Troubleshooting with the Comfort controller
RITTAL cooling unit assembly and operating instructions
Possible cause
Door open or door limit switch
incorrectly positioned
Cooling capacity inadequate/unit undersized.
Error as a consequence of messages A03 to
A17.
Filter mat soiled
Ambient temperature outside of admissible
operating range (+10°C to +60°C)
Operational display in case of icing hazard.
Evaporator coil fan may be mechanically
blocked, defective, or cold air outlet
obstructed.
Ambient temperature too high
Condenser soiled
Filter mat soiled
Condenser fan defective
E-valve defective
H
PSA pressure-operated switch defective
Lack of coolant; sensor in front of or behind
condenser defective.
Condensate discharge kinked or blocked
Only in units with optional
condensate evaporation
Blocked or defective
Blocked or defective
Compressor overloaded
(internal winding protection)
Defective
(check by measuring the winding resistance)
Open or short-circuit
Open or short-circuit
Open or short-circuit
Open or short-circuit
For three-phase devices only:
Incorrect rotary field/phase absent
New board obstructed
Master and slave not connected
Error display not shown
Connection problem between the display
and the controller board
Cable defective; connection loose
Ambient parameters or heat loss outside of the applicable limits
Minimal heat loss inside the enclosure
Manual device reset required,
see "6.2.9 Resetting the Comfort controller", page 32.
6 Operation
Measures to rectify the fault
Close door, position door limit switch correctly,
check connection if necessary
Check cooling capacity
Clean or replace;
reset the Comfort controller
Raise or lower the ambient temperature
(e.g. heat or ventilate the room)
Set the enclosure interior temperature to
a higher value. Check the evaporator fan;
release or exchange if necessary.
Lower the ambient temperature;
reset the Comfort controller
Clean the condenser;
reset the Comfort controller
Clean or replace;
reset the Comfort controller
Replace;
reset the Comfort controller
Have the sensor repaired by a refrigeration
engineer; reset the Comfort controller
Have the switch replaced by a refrigeration
engineer; reset the Comfort controller
Have the sensor repaired by a refrigeration
engineer; reset the Comfort controller
Check condensate discharge; repair any kinks
or blockages in the hose as necessary
Check the evaporation unit,
exchange if necessary
Clear the blockage; replace if necessary
Clear the blockage; replace if necessary
No action required;
unit switches back on automatically.
Exchange by refrigeration engineer
Replace
Replace
Replace
Replace
Replace
Exchange two phases
Software update needed (only following board
installation with more recent software):
Enter the programming level with Code 22;
press button 1 and confirm with "Set" until
"Acc" appears. Next, disconnect the unit from
the mains and reconnect.
Check setting and/or cable
Event is stored in the log file
Reset: Switch power supply off, then switch
on again after approx. 2 sec.
Exchange the boards
EN
31