AHT Cooling Systems E00 Error Code
Fault in electronic expansion valve E01 Fault in suction pressure sensor E02 Fau
Source: vento-spi__aht-vento-iom.pdf
What does AHT Cooling Systems E00 mean?
The controller detects a fault in the electronic expansion valve (EEV). This valve regulates refrigerant flow into the evaporator; when the control board loses communication with or receives an out-of-range signal from the EEV stepper motor driver, E00 triggers. The cabinet cannot maintain proper superheat and will likely shut the compressor down to protect the refrigerant circuit.
Symptoms
- E00 fault code displayed on the control panel with red status LED illuminated.
- Compressor cycles off; cabinet temperature rises above setpoint.
- Buzzer sounds to alert operating staff.
- Goods room temperature alarm may follow if cabinet stays warm.
Common causes
- Wiring harness between control board and EEV stepper motor damaged or disconnected.
- EEV stepper motor coil failure.
- Control board (PCB) fault preventing EEV drive output.
- EEV mechanically seized or jammed in closed or open position.
- Supply voltage interruption during EEV positioning cycle.
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Diagnostic steps
Record fault and move goods
Note the fault code and transfer perishable goods to another cabinet at the correct product temperature class to prevent loss.
Check EEV wiring connections
Inspect the connector between the control board and EEV stepper motor for loose pins, corrosion, or broken wires. Reseat connectors and inspect for damage.
Measure EEV coil resistance
Using a multimeter, check the resistance across each stepper motor winding pair on the EEV. Compare to the specification in the AHT service instructions; an open or shorted coil confirms EEV motor failure.
Inspect control board output
Verify the control board is outputting the correct drive signal to the EEV. A dead output channel indicates board replacement is required.
Replace defective component
Replace the EEV stepper motor, the EEV assembly, or the control board as indicated by testing. Use only AHT-approved spare parts.
Test and recommission
After repair, power the cabinet, confirm E00 clears, and allow 2 hours of trouble-free operation before reloading goods.
When to call a professional
EEV replacement and control board work require an AHT-authorized service technician. Work on the refrigerant circuit requires personnel certified for the applicable refrigerant (R-290 or R-134a). Contact the AHT service line at 00800/73783248 or via www.aht.at/service. Do not attempt to open the refrigerant circuit without proper certification and recovery equipment.
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Other AHT Cooling Systems Error Codes
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
E03 E04 E05 E06 E07 Falha no sensor de temperatura do gas de succao (sensor do c
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