Simulate the long-term reliability of washing machines under harsh environments such as high temperature, low temperature, high humidity, and temperature and humidity cycling, and verify the electrical safety, functional stability, structural durability, and material anti-aging capabilities of the entire machine/components.

"Type of environmental conditions"

- Temperature range: RT+10℃～85℃

- Humidity range: 90% to 98%RH

- Control accuracy: temperature ±0.5℃, humidity ±2%RH

- Workstation: 2 to 20 workstations, complete machine power-on operation/aging

Core testing content

1. High and low temperature storage

- High-temperature storage: 70℃, 48h → Material/component performance change (GB/T 2423.2-2008)

- Low temperature storage: -40℃, 48h → Circuit/mechanical damage (GB/T 2423.1-2008)

2. High and low temperature operation

- High-temperature operation: 60℃, 8h → Electrical/mechanical operational stability (GB/T 2423.2-2008)

- Low temperature operation: -20℃, 4h → Low temperature start-up/operation reliability (GB/T 2423.1-2008)

3. Constant damp heat

- Conditions: 40℃, 93%RH, 96h (commonly used: 40℃/85%RH, 500h)

- Electrical safety: insulation resistance (≥1MΩ after damp heat), voltage resistance, grounding continuity

- Control panel: Functionality/display/buttons remain normal after exposure to moisture

- Sealing: door seals, pipelines, and box bodies are designed to prevent leakage and condensation

- Materials: metal rust-proof, plastic/rubber anti-aging, no cracking or deformation

- Complete machine: washing/dehydration/drainage/door lock functions are normal

- Standards: IEC 60068-2-78, GB/T 2423.3, IEC 60335-2-7

4. Temperature and humidity cycling

- Conditions: such as 25℃→60℃→-20℃, humidity 85%~95%RH, cycling N times

- Content: Coupling of thermal shock and high humidity to verify the fatigue resistance of structure/solder joints/sealing/materials

5. Damp heat aging/Durability

- Conditions: 40℃/85%RH, continuous operation for hundreds of hours

- Content: Long-term reliability, noise, vibration, and power consumption changes of motors, transmissions, pumps, valves, and sensors

6. Recovery testing

- Condition: Allow the room temperature to recover for 30 minutes after the test

- Content: Whether the function/electrical safety has returned to normal

- Electrical: insulation, voltage resistance, grounding, leakage current, starting/operating current

- Functions: washing/rinsing/spin-drying/drying, water level/temperature/door lock, program control

- Structure: sealed, durable door/cover, pipeline/connector, no looseness/abnormal noise/deformation

- Materials: metal rusting, plastic/rubber aging, no abnormal appearance

- Environmental testing: GB/T 2423.1/2/3 low temperature/high temperature/damp heat

- Home appliance safety: GB 4706.1/4706.24, IEC 60335-2-7

- Performance: GB/T 4288