ACs’ sensors can help you find the cause of a malfunction. Systems notify users through error codes. They speed up the search time. Errors resulting from compressor issues and lack of Freon are considered the most serious ones and likely to affect a devices further operability.
| 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 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 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 | |
| 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 | ||
| A14 | Icing temperature sensor | ||
| A15 | Condensate warning temperature sensor | ||
| A16 | Internal temperature sensor | ||
| 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 | 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 | ||
| b07 | Cooling circuit leak | Sensor B3 and B4 mixed up | Correct sensor position |
| rSt | Reset | Manual device reset required | |
| OL | Overload | Ambient parameters or heat loss outside of the applicable limits | |