AHT Cooling Systems E35 Error Code
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Source: vento-spi__aht-vento-iom.pdf
What does AHT Cooling Systems E35 mean?
The controller reports that internal goods room temperature is too high. The goods room sensor has measured a temperature above the permissible upper alarm threshold, indicating the cabinet is unable to maintain the required storage temperature for the products being cooled or frozen. E35 requires immediate attention to prevent product spoilage.
Symptoms
- E35 displayed with red LED and buzzer active.
- Goods room temperature reading above the high-temperature alarm setpoint.
- Cabinet may be running but unable to pull temperature down.
- Product temperature may be rising — spoilage risk.
Common causes
- Condenser coils dirty or blocked, reducing heat rejection capacity.
- Compressor not running due to safety trip or failure.
- Refrigerant loss reducing cooling capacity.
- Excessive ambient temperature around the cabinet limiting condenser performance.
- Night blind or air curtain not functioning, allowing warm air infiltration.
- Cabinet overloaded with warm goods beyond its rated load capacity.
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Diagnostic steps
Move goods immediately
Transfer all temperature-sensitive goods to another cabinet at the correct product temperature class before product temperature exceeds safe limits.
Check if compressor is running
Listen and confirm the compressor is operating. If not running, check for other active fault codes indicating compressor safety trip.
Inspect condenser
Check condenser coils and air intake/discharge grilles for dust and blockage. Clean condenser coils if dirty per the AHT cleaning procedure.
Check ambient temperature
Verify room temperature around the cabinet is within the rated ambient temperature class for the device. Excessive ambient heat reduces condenser efficiency.
Verify night blind and air curtain
Confirm the night blind (where fitted) retracts correctly during day operation and the air curtain is flowing properly to minimize warm air infiltration.
Contact AHT service
If the cause is not correctable by cleaning or load management, contact AHT service at 00800/73783248 or www.aht.at/service for refrigerant or compressor diagnosis.
When to call a professional
If goods room high temperature is due to refrigerant loss, compressor failure, or control system fault, contact AHT service at 00800/73783248 or www.aht.at/service. These faults require a certified technician for safe and effective repair.
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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
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
Sources: www.aht.at