AHT Cooling Systems E08 Error Code
compressor Falha no sensor de temperatura do pressao) E10 E09 gas térmico (senso
Source: vento-spi__aht-vento-iom.pdf
What does AHT Cooling Systems E08 mean?
The controller detects a fault in the heating gas temperature sensor (pressure tube sensor). This probe monitors the discharge gas temperature at the pressure tube (hot gas line) exiting the compressor. An open-circuit, short-circuit, or out-of-range reading triggers E08, disabling discharge temperature protection.
Symptoms
- E08 fault code displayed with red LED and buzzer active.
- Discharge gas temperature monitoring disabled.
- Compressor protection against overheating may rely on mechanical devices only.
- Cabinet temperature regulation may be affected.
Common causes
- Pressure tube sensor (discharge temperature sensor) open-circuit or short-circuit failure.
- Sensor lead damaged by heat or physical contact with hot compressor discharge line.
- Loose or corroded connector at sensor or control board.
- Sensor clamp shifted from the pressure tube, causing inaccurate and out-of-range readings.
- Control board input channel failure.
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Diagnostic steps
Protect goods and log fault
Move perishable goods to a correctly rated cabinet. Record fault code and device serial number.
Locate the pressure tube sensor
Find the temperature probe clamped to the discharge line (pressure tube) close to the compressor outlet per AHT Vento service documentation.
Check sensor mounting and wiring
Confirm the sensor is securely clamped to the hot gas line and its lead is routed away from excessive heat sources. Reseat connectors.
Test sensor resistance
Disconnect the sensor and measure resistance at ambient temperature with a multimeter. Compare to the NTC curve; open or short confirms failure.
Replace the sensor
Fit an AHT-approved discharge temperature sensor in the correct clamped position on the pressure tube.
Clear fault and verify operation
Restore power, confirm E08 clears, and run for 2 hours before reloading goods.
When to call a professional
The discharge line sensor is mounted on a high-temperature, high-pressure refrigerant line. Contact an AHT-authorized technician at 00800/73783248 or www.aht.at/service for replacement if the sensor mounting is in a confined compressor compartment.
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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
E34 E35 (software de seguranca) Pressao de aspiracao demasiado baixa Sobreaqueci
Sources: www.aht.at