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6 Operation
Display
System message
GB
screen
A01
Enclosure door open
A02
Enclosure interior
temperature 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
Temperature sensor
Icing
A15
Temperature sensor
Condensate warning
A16
Temperature sensor
Internal temperature
A17
Phase monitoring
A18
EPROM error
A19
LAN/Master-Slave
A20
Voltage drop
E0
Display message
Tab. 6: Troubleshooting with the Comfort controller
30
Possible cause
Door open or door limit switch
incorrectly positioned
Cooling capacity too low/
unit underdimensioned.
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 fan may be mechanically
blocked or defective.
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
(inner 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
Open or short circuit
For three-phase devices only:
Incorrect rotary field/phase absent
New board obstructed
Master and slave not linked
Error display not shown
Connection problem between display
and controller board
Cable defective; connection loose
Measures to rectify the fault
Close door, position door limit switch correctly,
check connection if necessary
Check cooling capacity
Clean or exchange;
reset the Comfort controller
Increase or lower the ambient temperature
(e.g. heat or ventilate room)
Set the enclosure interior temperature higher.
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 exchange;
reset the Comfort controller
Replace;
reset the Comfort controller
Repair by refrigeration engineer;
reset the Comfort controller
Exchange by refrigeration engineer;
reset the Comfort controller
Repair by refrigeration engineer;
reset the Comfort controller
Check condensate discharge; remove any
kinks or blockages in the hose
Check the evaporation unit, exchange if
necessary
Clear the blockage; exchange if necessary
Clear the blockage; exchange if necessary
No action required;
unit switches on again independently.
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. Then disconnect the unit from
the mains and re-connect.
Check setting and/or cable
Result is stored in the log file
Reset: Switch power supply off, then switch on
again after approx. 2 sec.
Exchange the boards
Rittal cooling unit assembly instructions
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