Irinox A11

What does Irinox A11 mean?

The MULTIFRESH NEXT control has detected that core temperature reading point 2 of the multi-point core probe is out of range or open-circuit. As with point 1, the probe uses a PT1000 sensor; when the resistance value falls outside the expected range the board raises A11 and the affected reading point is considered unreliable. The alarm auto-resets when a valid signal is restored.

Symptoms

• A11 alarm code shown on the MULTIFRESH NEXT display
• Core probe point 2 temperature reading absent, dashed, or showing an error value
• Cycle may revert to time-based completion rather than relying on the core probe
• Intermittent alarm clearance when the probe is repositioned or the connector is disturbed
• Visible damage or corrosion on the core probe or door connector

Common causes

• Core probe PT1000 sensor at reading point 2 is interrupted or out of range
• Precarious connection of the core probe to the door-mounted connector
• Oxide or moisture on the connector contacts inside the cabinet door
• Loose or damaged wires on J3 connector corresponding to probe point 2 signals
• Precarious connection between front board connectors J4 and J16
• Core probe mechanically damaged or deformed

Diagnostic steps

1. 01

   Physically inspect the core probe

   Remove the probe and examine the needle for deformation, cracks, or corrosion affecting point 2 of the sensor array. Replace the probe if physical damage is evident.

2. 02

   Clean and reseat the door connector

   Disconnect the core probe from the door connector, clean all contacts with electrical contact cleaner to remove oxide, and firmly reconnect. Check whether A11 clears after reconnection.

3. 03

   Measure PT1000 resistance for point 2

   With the probe unplugged, measure resistance across the PT1000 wires specific to point 2. An expected reading near 1000 Ω at 0 °C confirms sensor integrity; an open circuit or out-of-range value confirms the probe must be replaced.

4. 04

   Inspect J3 wiring for probe point 2 signals

   Trace the wiring harness for the point 2 signals to J3, checking pole connections for loose crimps, broken conductors, or insulation damage. Repair any wiring faults found.

5. 05

   Reseat J4 and J16 on the front board

   At the front electronic board, carefully unplug and firmly reseat connectors J4 and J16. Inspect all pins for bending or corrosion before restoring power and rechecking the alarm.

6. 06

   Replace core probe if all wiring checks pass

   If the electrical path is confirmed good from J3 through J4/J16 but the PT1000 measurement at point 2 remains out of specification, replace the core probe with the correct Irinox multi-point PT1000 part.

When to call a professional

Escalate to an Irinox-authorised service technician if A11 persists after probe replacement and all wiring and connector checks are satisfactory, indicating a possible front board input fault. In HACCP-regulated kitchens, core probe validation after repair is mandatory and must be performed or signed off by a qualified technician before resuming food production cycles.