Rittal Air Conditioner Error Codes

System messages are shown on the display screen of the Comfort controller via the displays A1 to A20 and E0.

Error Codes	System message	Possible cause
A1	Enclosure door open	Door open or door limit switch incorrectly positioned
A2	Internal temperature of enclosure too high	Cooling capacity inadequate/unit undersized. Error as a consequence of messages A03 to A17.
A3	Filter monitoring	Filter mat soiled
A4	Ambient temperature too high/too low	Ambient temperature outside of admissible operating range (+10°C to +60°C)
A5	Icing hazard	Operational display in case of icing hazard.
A6	PSAH pressure-operated switch	Ambient temperature too high
A7	Evaporator coil	Lack of coolant; sensor in front of or behind condenser defective.
A8	Condensate warning	Condensate discharge kinked or blocked
A9	Condenser fan blocked or defective	Blocked or defective
A10	Evaporator fan blocked or defective	Blocked or defective
A11	Compressor	Compressor overloaded
A12	Condenser	Open or short-circuit
A13	Ambient temperature sensor	Open or short-circuit
A14	Icing temperature sensor	Open or short-circuit
A15	Condensate warning temperature sensor	Open or short-circuit
A16	Internal temperature sensor	Open or short-circuit
A17	Phase monitoring	For three-phase devices only: Incorrect rotary field/phase absent
A18	EPROM	New board obstructed
A19	LAN/Master-Slave	Master and slave not connected
A19	LAN/Master-Slave	Error display not shown
A20	Voltage drop
E0	Display message	Connection problem between the display and the controller board
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”,

Rittal AC Fault Indication and Fault Analysis:

Fault: 1

Cause: Cooling output too low (lack of coolant) Consequential fault or faults 2-7. Remedy: Check cooling output Carry out cooling service.

Fault: 2 Cause: Compressor overloaded (internal winding protection). Remedy: Unit will switch on automatically.

Fault: 3 Cause: Operational indication if risk of icing up exists. Remedy: Raise the setpoint value of the internal temperature of enclosure.

Fault: 4 Cause: Ambient temperature too high. Remedy: Unit’s specified range of application exceeded

Fault: 5 Cause: Blocked or defective. Remedy: Replace.

Fault: 6 Cause: Blocked or defective. Remedy: Replace.

Fault: 7

Cause: Filter mat contaminated. Remedy: Clean or replace.

Fault: 8 Cause: Cable break or short-circuit. Remedy: Replace.

Fault: 9 Cause: Incorrect field of rotation. Remedy: Reverse two phases.

Troubleshooting

Trouble: The unit does not switch on.

Possible Cause: No power supply.

Correction: Check the mains connection and the pre-fuse.

Trouble: The unit does not cool/heat adequately.

Possible Cause:

1. The air circulation inside the enclosure is impaired.
2. Ambient temperature too high/low.
3. Filter equipment contaminated.
4. Internal fan defective.
5. External fan defective.
6. The heat produced in the enclosure exceeds the cooling capacity of the Peltier climate control unit.

Correction:

1. Check the air circulation inside the enclosure. Check, in particular, those components equipped with a fan. Check the free spaces above and below the main heat dissipation sources.
2. Reduce the ambient temperature. Protect the unit from radiation heat caused by direct sunshine and hot surfaces.
3. Check the filter and, if necessary, clean or replace.
4. Replace unit.
5. Replace unit.
6. Reduce the heat loss.

Trouble: Condensation.

Possible Cause:

1. Enclosure leakages.
2. Internal temperature of enclosure set too low.

Correction:

1. Check the enclosure for leaks (IP 54). Check, in particular, the cable entry points for leaks.
2. Check the set enclosure internal temperature (factory setting: +35°C).

Rittal Air Conditioner Manual PDF