Rittal Air Conditioner Error Codes
Rittal Air Conditioner Error Codes

Rittal Air Conditioner Error Codes

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. Rittal wall-mounted refrigeration units or cabinet air conditioners are the products that we pay special attention to in production. The company produces several lines that can surprise a large number of users, despite their specificity and narrowly targeted use.

Rittal Air Conditioner Error Code Solutions

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.

Rittal Air Conditioner Electrical wiring plan


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.


  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.


  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).

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