Rittal SK 3302.100 Assembly And Operating Instructions Manual - 6 Operation
6 Operation
Rittal cooling unit assembly and operating instructions
29
EN
Tab. 6: Troubleshooting with the e-Comfort controller
Display
screen
System message
Possible cause
Measures to rectify the fault
A01
Enclosure door open
Door open or door limit switch
incorrectly positioned
Close door, position door limit switch correctly,
check connection if necessary
A02
Internal temperature
of enclosure too high
Cooling capacity inadequate/unit undersized.
Error as a consequence of messages A03 to
A17.
Check cooling capacity
A03
Filter monitoring
Filter mat soiled
Clean or replace;
reset the e-Comfort controller
A04
Ambient temperature
too high/too low
Ambient temperature outside of admissible
operating range (+10°C to +60°C)
Raise or lower the ambient temperature
(e.g. heat or ventilate the room)
A05
Icing hazard
Operational display in case of icing hazard.
Evaporator coil fan may be mechanically
blocked, defective, or cold air outlet
obstructed.
Set the enclosure interior temperature to
a higher value. Check the evaporator fan;
release or exchange if necessary.
A06
PSA
H
pressure-operated
switch
Ambient temperature too high
Lower the ambient temperature;
reset the e-Comfort controller
Condenser soiled
Clean the condenser;
reset the e-Comfort controller
Filter mat soiled
Clean or replace;
reset the e-Comfort controller
Condenser fan defective
Replace; reset the e-Comfort controller
E-valve defective
Have the sensor repaired by a refrigeration
engineer; reset the e-Comfort controller
PSA
H
pressure-operated switch defective
Have the switch replaced by a refrigeration
engineer; reset the e-Comfort controller
A07
Evaporator coil
Lack of coolant; sensor in front of or behind
condenser defective.
Have the sensor repaired by a refrigeration
engineer; reset the e-Comfort controller
A08
Condensate warning
Condensate discharge kinked or blocked
Check condensate discharge; repair any kinks
or blockages in the hose as necessary
Only in units with optional
condensate evaporation
Check the evaporation unit,
exchange if necessary
A09
Condenser fan
Blocked or defective
Clear the blockage; replace if necessary
A10
Evaporator fan
Blocked or defective
Clear the blockage; replace if necessary
A11
Compressor
Compressor overloaded
(internal winding protection)
No action required;
unit switches back on automatically.
Defective
(check by measuring the winding resistance)
Exchange by refrigeration engineer
A12
Condenser temperature
sensor
Open or short-circuit
Replace
A13
Ambient temperature
sensor
Open or short-circuit
Replace
A14
Icing temperature sensor
Open or short-circuit
Replace
A15
Condensate warning
temperature sensor
Open or short-circuit
Replace
A16
Internal temperature sensor Open or short-circuit
Replace
A17
Phase monitoring
For three-phase devices only:
Incorrect rotary field/phase absent
Exchange two phases
A18
EPROM error
New board obstructed
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.
A19
LAN/Master-Slave
Master and slave not connected
Check setting and/or cable
A20
Voltage drop
Error display not shown
Event is stored in the log file
E0
Display message
Connection problem between the display
and the controller board
Reset: Switch power supply off, then switch
on again after approx. 2 sec.
Cable defective; connection loose
Exchange the boards
OL
Overload
Ambient parameters or heat loss outside of the applicable limits
b07
Cooling circuit leak
Sensor B3 and B4 mixed up
Correct sensor position
rSt
Reset
Manual device reset required,
see “6.2.10 Resetting the e-Comfort controller”, page 30.