Rittal SK 3126.230, Assembly And Operating Instructions Manual

Page: 36 / 44

36 RITTAL Compact split cooling unit assembly and operating instructions
6 Operation
EN
Tab. 5: Troubleshooting with the Comfort controller
Di s play
s creen
S y s tem me ss a g e Po ss ible cau s e Mea s ure s to rectify the fault
A01 Safe door open Door open or door limit switch incorrectly
positioned Close door, position door limit switch correctly,
check connection if necessary
A02 Safe internal temperature
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 Comfort controller
A04 Ambient temperature
too high/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 ob-
structed. Set the setpoint for the safe internal tempera-
ture 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 Comfort controller
Condenser soiled Clean the condenser;
reset the Comfort controller
Filter mat soiled Clean or replace;
reset the Comfort controller
Condenser fan defective Replace;
reset the Comfort controller
E-valve defective Have the sensor repaired by a refrigeration
engineer; reset the Comfort controller
PSA
H
pressure-operated switch defective Have the switch replaced by a refrigeration
engineer; reset the 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 Comfort controller
A08 Condensate warning Condensate discharge kinked or blocked Check condensate drainage;
repair any kinks or blockages in the hose
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
LH Low heat Low heat loss inside the safe
rSt Reset Manual device reset required,
see section “6.1.8 Resetting the Comfort controller”, page 37.