Irinox A55 Error Code

What does Irinox A55 mean?

The control board has detected that condenser 3 has exceeded its safe operating temperature as measured by probe RV8.3 (NTC-type). Thresholds are 60°C for Standard/Eco Silent (climate class 4), 65°C for Turbo/Turbo Silent (climate class 5), and 55°C for water-cooled versions. This block cycle alarm halts operation and requires manual reset by a technician before the unit can resume any cycle.

Symptoms

• Unit stops cycling and displays alarm code A55 on the control panel
• Manual reset required before the machine will restart
• Condenser 3 section is abnormally hot during or after the alarm event
• Condenser 3 fans may be audibly absent, slow, or intermittent
• Possible high discharge pressure if the refrigeration circuit is also being monitored

Common causes

• Ambient room temperature exceeding the unit's climate class rating
• Condenser 3 fan motor failure or degraded performance
• Faulty capacitor on the condenser 3 fan circuit
• Faulty KM1 auxiliary contact preventing fan energization
• Incorrect or absent 0–10V DC signal from power board to EC-type condenser fan
• Blocked or heavily soiled condenser filter reducing airflow across condenser 3
• Loose or damaged wiring to RV8.3 probe or condenser 3 fan assembly

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Diagnostic steps

1. Verify room and installation conditions

   Confirm that ambient temperature is within the climate class specification for this unit. Check that the machine has adequate clearance on all sides and that hot air exhaust is not being recirculated back to the condenser intake.

2. Clean or replace the condenser filter

   Inspect the filter serving condenser 3. A blocked filter is one of the most common causes of high condensing temperature; clean or replace it before further diagnosis.

3. Test condenser 3 fan circuit

   Confirm all fans assigned to condenser 3 are operating at the correct speed. Test the fan capacitor with a capacitance meter, verify KM1 auxiliary contact continuity, and check the 0–10V DC output from the power board to any EC fans.

4. Check wiring and probe connections

   Inspect cable connections at the RV8.3 NTC probe and along the condenser 3 fan wiring harness. Repair or re-terminate any loose, corroded, or damaged connections found.

5. Validate RV8.3 probe accuracy

   Measure RV8.3 probe resistance at a known temperature and cross-reference with the NTC resistance table in the service manual. Replace the probe if values are out of specification.

6. Reset alarm and confirm resolution

   After correcting the fault and confirming condenser 3 temperature is below the alarm threshold, perform the manual reset on the control panel. Run a full test cycle and observe condenser 3 temperatures for stable, in-range readings.

When to call a professional

Contact a licensed Irinox-authorized technician if fan motors, contactors, or the EC fan power board require replacement, or if elevated condensing temperature persists after cleaning and electrical checks. Any suspected refrigerant-side issue contributing to high head pressure, or any work involving high-voltage electrical components, must be handled by a qualified refrigeration professional.