E9
De'Longhi Low-Pressure / Refrigerant Loss Protection

De'Longhi dehumidifier displays E9 and will not start the compressor.

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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

Refrigerant leak in coils or tubing, Severely iced evaporator causing low suction pressure, Faulty low-pressure switch or sensor, Blocked capillary tube or expansion device

How to Fix / Troubleshooting

Safety first: Unplug the unit. Do not attempt to recharge refrigerant yourself.

Step-by-step:

  • 1. Check ambient temperature: Ensure the room is not below the minimum operating temperature (typically 5°C). Very low temperatures can trigger low-pressure faults.
  • 2. Inspect evaporator for ice: Remove the front cover and look at the evaporator coil. If it is a solid block of ice, allow the unit to defrost completely (leave unplugged for several hours) and then restart. Check that the defrost sensor and fan are working.
  • 3. Look for oil stains: Examine copper tubing and joints for oily residue, which can indicate a refrigerant leak.
  • 4. Monitor operation: After defrosting and restarting, if E9 returns quickly and the coil does not get cold, the system may be low on refrigerant or have a restriction.
  • 5. Call a technician: Low-pressure faults almost always require sealed-system diagnosis, leak detection, and recharging by an authorized De'Longhi service center.
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Repair Difficulty

Professional Required 5/5

Required Part

Refrigerant Circuit (Evaporator/Condenser Assembly)
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