Irinox A58

What does Irinox A58 mean?

This alarm is specific to the largest MultiFresh Next models (L and LL), which feature three condenser circuits. The control board has detected that the DT sensor on condenser 3 is reporting a temperature below the minimum acceptable threshold. The unit blocks the current cycle and requires manual reset. Because condenser 3 is the third circuit on the largest machines, this alarm may also indicate an imbalance in load distribution across the three condenser circuits.

Symptoms

• A58 alarm code shown on the control panel on an L or LL model unit
• Unit halted mid-cycle; manual reset required to restart
• Condenser 3 DT sensor reading is unusually low compared to condensers 1 and 2
• Possible visible frost or unusually cold surfaces near condenser 3 in extreme cases
• Alarm event recorded in the controller fault log

Common causes

• Defective DT sensor on condenser 3 producing a false low-temperature signal
• Wiring fault or open circuit in the condenser 3 DT sensor harness
• Refrigerant undercharge or circuit fault on condenser 3
• Ambient temperature too low relative to the unit's operating envelope
• Water supply overcooling condenser 3 on water-cooled versions
• Incorrect calibration offset programmed for condenser 3 DT in the controller

Diagnostic steps

1. 01

   Confirm model is L or LL variant

   Verify on the unit nameplate that the machine is a MultiFresh Next L or LL, as A58 only applies to three-condenser models. Misidentification could lead to unnecessary diagnostics.

2. 02

   Read condenser 3 DT sensor in service menu

   Access the live sensor data in the controller and compare the condenser 3 DT reading against condensers 1 and 2 and ambient temperature. A reading significantly lower than the others points to a sensor or wiring fault rather than a system-wide condition.

3. 03

   Inspect condenser 3 DT sensor wiring

   Trace the sensor cable from condenser 3 to the control board. Check for broken wires, corroded terminals, or disconnected plugs. Repair or replace the harness as necessary.

4. 04

   Test DT sensor resistance

   With the sensor disconnected, measure its resistance at a known temperature and compare to the NTC resistance–temperature curve in the Irinox service manual. Replace the sensor if out of specification.

5. 05

   Check ambient and water conditions at condenser 3

   Verify that condenser 3's airflow environment and, on water-cooled models, its water supply temperature and flow rate are within Irinox's specified operating parameters. Correct any out-of-range conditions before resetting.

6. 06

   Reset and monitor condenser 3 temperature

   Perform the manual reset after resolving the fault. Run a supervised cycle and monitor condenser 3 DT readings to confirm they are consistent with condensers 1 and 2 and within normal range.

When to call a professional

Escalate to a licensed Irinox-authorized technician if condenser 3 low-temperature readings persist after sensor and wiring diagnosis, particularly if a refrigerant-side fault on the third circuit is suspected. Work on multi-circuit refrigerant systems, including pressure checks and refrigerant handling, must be carried out by a certified refrigeration engineer.