AHT Cooling Systems E02 Error Code
E03 E04 E05 E06 E07 Falha no sensor de temperatura do gas de succao (sensor do c
Source: vento-spi__aht-vento-iom.pdf
What does AHT Cooling Systems E02 mean?
The control board detects a fault in the suction gas temperature sensor (suction manifold sensor). This NTC or thermistor probe monitors refrigerant temperature at the suction line to calculate superheat. A broken wire, failed sensor, or out-of-range reading causes E02, preventing accurate superheat control and potentially triggering compressor protection.
Symptoms
- E02 fault code on display with red LED.
- Buzzer activates to alert staff.
- Superheat control disabled; EEV reverts to a safe default position.
- Cabinet temperature may drift above or below setpoint.
Common causes
- Suction gas temperature sensor (suction manifold sensor) open-circuit or short-circuit failure.
- Wiring harness between sensor and control board damaged or connector loose.
- Sensor displaced from its mounting point on the suction line.
- Corrosion or moisture ingress at sensor connector.
- Control board sensor input channel failure.
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Diagnostic steps
Move goods and record code
Transfer perishable goods to a cabinet at the correct temperature class and note the fault code and device serial number.
Locate the suction manifold sensor
Identify the temperature probe clamped to or inserted in the suction manifold or suction line, per the AHT service diagram for your Vento variant.
Inspect sensor wiring
Check the sensor lead and connector for cuts, pinching, or corrosion. Reseat the connector firmly; a poor contact is the most common cause.
Measure sensor resistance
Disconnect the sensor and measure resistance with a multimeter at ambient temperature. Compare to the NTC curve in the AHT service manual; open or short circuit confirms sensor failure.
Replace sensor if defective
Fit an AHT-approved replacement sensor, ensuring correct placement and secure mounting on the suction line.
Clear fault and verify
Power up the cabinet and confirm E02 clears. Allow 2 hours of normal operation before reloading goods.
When to call a professional
Sensor replacement is a refrigeration service task. On R-290 (propane) units, any work near the refrigerant circuit requires technicians certified for flammable refrigerants. Contact AHT service at 00800/73783248 or www.aht.at/service to dispatch an authorized technician.
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Other AHT Cooling Systems Error Codes
Fault in electronic expansion valve E01 Fault in suction pressure sensor E02 Fau
Fault in air intake sensor E04 Fault in air outlet sensor E05 Fault in slat sens
Fault in high-pressure sensor E07 Fault in compressor safety chain E08 Fault in
Fault in internal temperature sensor (Goods room) E10 Supply voltage too low/too
Low battery voltage (see → Chapter 10.2.3) E12 Fault in software class B (safety
Fault in EEPROM (control board defective) E32 Suction pressure too low E33 Super
Superheating too high E35 Internal temperature too high (goods room) E36 Interna
Control temperature too low E38 Control temperature too high E39 Run-time fault
Fault in internal memory E41 Heating gas temperature too high (pressure tube sen
Time-out Valve opening 100% E43 Condensation pressure too high E44 External alar
compressor Falha no sensor de temperatura do pressao) E10 E09 gas térmico (senso
E34 E35 (software de seguranca) Pressao de aspiracao demasiado baixa Sobreaqueci
Sources: www.aht.at