Irinox A30 Error Code

What does Irinox A30 mean?

Alarm A30 means the MULTIFRESH NEXT has detected that the installation room temperature is outside its rated operating range. For Standard or Eco Silent performance models (climate class 4) the upper limit is 38 °C; for Turbo or Turbo Silent models (climate class 5) the limit is 43 °C. The lower limit is 5 °C for all variants. The alarm is also triggered if room probe RV6 is miscalibrated or the PU board analogue input is faulty. The cycle is blocked until ambient conditions return to the valid range.

Symptoms

• A30 is displayed and the active cycle is blocked, often during warm summer periods or in poorly ventilated plant rooms
• Alarm clears automatically when room temperature returns within spec
• Alarm may appear erroneously in a room that is clearly within range, suggesting a probe or board issue
• The room temperature reading on the controller display may show an implausible value if RV6 is miscalibrated
• Repeated A30 events during normal seasons indicate HVAC or ventilation problems in the installation space

Common causes

• Room temperature genuinely exceeds 38 °C (Standard/Eco Silent, climate class 4) or 43 °C (Turbo/Turbo Silent, climate class 5)
• Room temperature genuinely falls below 5 °C regardless of performance class
• Room probe RV6 is incorrectly calibrated, causing a false out-of-range reading
• PU power board analogue input for RV6 is faulty
• Oxidation or poor connection on M5 terminal block poles 5–6 affecting the RV6 signal

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Diagnostic steps

1. Measure actual room temperature independently

   Use a calibrated reference thermometer near the unit's air intake to confirm the true ambient temperature. Compare this to the controller's room temperature reading to determine whether A30 is genuine or probe-related.

2. Address genuine room temperature issues

   If the room is confirmed too hot or too cold, improve ventilation, air conditioning, or heating in the installation area to bring ambient conditions within the unit's climate class specification before restarting the cycle.

3. Inspect M5 terminal block poles 5–6

   Power down, open the electrical panel, and check M5 poles 5–6 for loose terminations, oxidation, or corrosion on the RV6 probe wiring. Clean and re-torque all connections.

4. Verify and recalibrate RV6 room probe

   Measure RV6 probe resistance at a known ambient temperature and compare against the NTC table in the MULTIFRESH NEXT service manual. If calibration offset is available in the controller settings, adjust per the manual; replace the probe if resistance is out of spec.

5. Run a post-correction test

   Restore power, reset A30, confirm the controller's room temperature reading matches the reference thermometer, and run a test cycle to verify the alarm does not recur.

When to call a professional

If A30 persists in a room confirmed to be within the correct temperature range and RV6 readings remain erratic after cleaning M5 connections and replacing the probe, the PU power board analogue input is likely defective. Engage an Irinox-authorised technician for board diagnostics. Also consult a refrigeration or HVAC professional if the installation room cannot be brought within the required climate class operating range.