In order to help you fix the troubleshooting of RITTAL cooling units with Comfort Controller. A more detailed explanation of the system messages are shown on the display screen via the displays from A1 to A20 as the table below:
| RITTAL COMFORT CONTROLLER TROUBLESHOOTING | |||
| Display Screen | System Message | Possible Cause | Measures to Rectify the Fault |
| A01 | Enclosure door open |
a) Door open b) Door limit switch incorrectly positioned |
a) Close door b) Position door limit switch correctly, check connection if necessary |
| A02 | Internal temperature of enclosure too high |
a) Cooling capacity inadequate/unit undersized. b) Error as a consequence of messages A03 to A17. | a) Check cooling capacity b) Checking from A03 to A17. |
| A03 | Filter monitoring | Filter mat soiled | Clean or replace, reset the 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 | a) Operational display in case of icing hazard. b) Evaporator coil fan may be mechanically blocked, defective, or cold air outlet obstructed. |
a) Set the enclosure interior temperature to a higher value. b) Check the evaporator fan, release or exchange if necessary. |
| A06 | PSA H pressure-operated switch |
a) Ambient temperature too high b) Condenser soiled c) Filter mat soiled d) Condenser fan defective e) E-valve defective f) PSA H pressure-operated switch defective |
a) Lower the ambient temperature; reset the Comfort controller b) Clean the condenser; reset the Comfort controller c) Clean or replace; reset the Comfort controller d) Replace; reset the Comfort controller e) Have the sensor repaired by a refrigeration engineer; reset the Comfort controller f) 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 | a) Condensate discharge kinked or blockedb) Only in units with optional condensate evaporation |
a) Check condensate discharge; repair any kinks or blockages in the hose as necessary b) 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 |
a) Compressor overloaded b) Defective (check by measuring the winding resistance) |
a) No action required; unit switches back on automatically. b) 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 |
| EO | Display message | a) Connection problem between the display and the controller board b) Cable defective; connection loose |
a) Reset: Switch power supply off, then switch on again after approx. 2 sec. b) Exchange the boards |
| OL | Overload | Ambient parameters or heat loss outside of the applicable limits | |
| LH | Low heat | Minimal heat loss inside the enclosure | |
| rSt | Reset | Manual device reset required, see “6.2.9 Resetting the Comfort controller”, page 32. | |
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