Irinox A23 Error Code

What does Irinox A23 mean?

Exclusive to the largest MULTIFRESH NEXT L and LL models, alarm A23 indicates the PU power board cannot read a valid signal from condenser probe RV8.3 (NTC-type), wired to M5 terminal block poles 11–12. With condenser 3 monitoring unavailable, the controller immediately blocks the active cycle and will reset automatically once a valid probe signal is re-established.

Symptoms

• Active blast-chill or freezing cycle blocks and A23 appears on the display
• Condenser 3 temperature reading shows an implausible or error value on the controller
• Alarm A23 only appears on L or LL platform units, never on S, M, SL, or ML models
• Alarm may clear and retrigger intermittently if the M5 connection is marginally loose
• No simultaneous condenser high-temperature alarm for condenser 3 is active

Common causes

• Condenser probe RV8.3 (NTC-type) is faulty or has developed an open-circuit fault
• Loose or precarious connection of RV8.3 wiring at M5 terminal block poles 11–12
• Oxidation or corrosion on M5 terminal block poles 11–12
• PU power board analogue input channel for RV8.3 is faulty or damaged

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Diagnostic steps

1. Isolate and inspect M5 poles 11–12

   Shut off power to the unit, open the electrical enclosure, and visually inspect M5 terminal block poles 11–12 for loose wires, green or white oxidation, and heat discoloration. Clean contacts and re-torque terminations securely.

2. Measure RV8.3 probe resistance

   Disconnect RV8.3 from M5 poles 11–12 and measure resistance with a calibrated multimeter at ambient temperature. Validate the reading against the NTC resistance/temperature table in the MULTIFRESH NEXT service manual; open circuit or an out-of-range value indicates probe failure.

3. Trace and inspect the RV8.3 wiring harness

   Follow the cable from RV8.3 to M5 poles 11–12 and check for physical damage, abrasion against condenser fins or sheet metal edges, and heat damage. Repair or replace damaged sections using correct cable type.

4. Replace RV8.3 probe if confirmed defective

   Install a genuine Irinox NTC replacement probe for RV8.3, route the cable securely away from sharp edges and heat sources, and make clean, firm terminations at M5 poles 11–12.

5. Restore power and validate with a test cycle

   Power on, reset A23, and run a blast-chill cycle while observing the condenser 3 temperature reading to confirm it responds correctly and the alarm does not recur.

When to call a professional

Escalate to an Irinox-authorised technician if A23 persists after a confirmed good probe and clean M5 terminals at poles 11–12, as this points to a defective PU power board analogue input. Power board replacement on the L/LL platform involves high-voltage components and must only be carried out by a qualified service engineer with access to Irinox factory schematics and spare parts.