Ariston Short Cycling / Control Instability

Dehumidifier frequently turns on and off; short cycling

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Humidity setpoint too close to room humidity, Faulty humidity sensor, Oversized unit for small space, Control board hysteresis issue

How to Fix / Troubleshooting

Safety: Unplug before accessing internal components.

Steps to reduce short cycling:

  • 1. Adjust setpoint: Set the desired humidity a few percent lower than current room humidity to avoid rapid cycling.
  • 2. Increase air circulation: Ensure the unit is not in a very small, enclosed space where it quickly reaches setpoint.
  • 3. Check humidity sensor: If the displayed humidity jumps rapidly, the humidity sensor module may be faulty and should be replaced.
  • 4. Control board: If behavior persists with a new sensor, the main control board may have a hysteresis or relay fault and require replacement.
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Repair Difficulty

Medium 3/5

Required Part

Humidity Sensor Module
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