Irinox A15 Error Code

What does Irinox A15 mean?

The MULTIFRESH NEXT control has detected that the chamber air temperature probe RV1 (NTC-type) is faulty, open-circuit, or reading outside the expected range. RV1 is the primary sensor used to monitor and control the cabinet air temperature during blast-chill and blast-freeze cycles. Because this probe is critical to cycle control, the alarm blocks the active cycle until the fault is resolved.

Symptoms

• A15 alarm displayed on the MULTIFRESH NEXT control panel with the cycle blocked
• Chamber air temperature reading absent, erratic, or showing an implausible value on the display
• Blast-chill or blast-freeze cycle will not start or halts mid-cycle
• Refrigeration system may continue to run without proper temperature feedback, risking over-cooling
• Alarm auto-resets only after a valid RV1 reading is restored

Common causes

• Chamber probe RV1 (NTC-type) faulty, open-circuit, or outside the readable resistance range
• PU power board analogue input for RV1 faulty
• Precarious or corroded connection of RV1 probe wires to M5 terminal block poles 1 and 2
• Oxide build-up on M5 terminal block poles 1 and 2 degrading the signal

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Diagnostic steps

1. Locate and visually inspect RV1 probe

   Identify the RV1 NTC chamber probe inside the MULTIFRESH NEXT cabinet. Inspect the probe body, cable, and termination for visible damage, moisture ingress, or corrosion.

2. Inspect and clean M5 terminal block poles 1 and 2

   Access the M5 terminal block and examine poles 1 and 2 where RV1 connects. Remove oxide with a terminal cleaning tool or fine abrasive, retighten the screw terminals firmly, and check for secure wire seating.

3. Measure RV1 NTC resistance

   Disconnect the RV1 probe wires from M5 poles 1 and 2 and measure resistance with a calibrated multimeter at known ambient temperature, cross-referencing against the NTC resistance-temperature table in the MULTIFRESH NEXT service manual. An open circuit or wildly out-of-range value confirms probe failure.

4. Replace RV1 probe if faulty

   If the NTC resistance measurement is outside specification, replace RV1 with the correct Irinox-specified NTC probe. Route and secure the replacement probe wiring in the same manner as the original.

5. Reconnect to M5 and clear alarm

   Reconnect the probe wires securely to M5 terminal block poles 1 and 2, restore power, and confirm A15 clears. Restart a test cycle and verify stable chamber temperature readings on the display.

6. Evaluate PU power board if alarm persists

   If a confirmed good probe and clean terminals do not resolve A15, the PU power board analogue input may be faulty. Document probe resistance measurements as evidence before proceeding to board-level diagnosis.

When to call a professional

Because A15 blocks the blast-chill cycle, escalate promptly to an Irinox-authorised technician if probe replacement and terminal remediation do not clear the fault. A faulty PU power board analogue input requires board-level diagnosis and potentially board replacement, which must be carried out by a qualified technician with access to Irinox service software to restore and verify machine parameters.