Lanbo Single-Zone Cooling Failure in Dual-Zone Unit

Upper zone cools properly but lower zone is warm (dual-zone model).

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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

Failed lower zone evaporator fan, Blocked air duct between zones, Lower zone temperature sensor failure, Partial refrigerant restriction to lower evaporator

How to Fix / Troubleshooting

Unplug the unit before accessing fans or panels.

  • 1. Confirm zone settings:
    • Ensure the lower zone setpoint is lower than room temperature and not in standby.
  • 2. Check lower zone fan:
    • Listen for the lower zone evaporator fan when the compressor runs.
    • Remove the lower rear interior panel and verify the fan spins freely.
  • 3. Inspect air ducts:
    • Ensure no insulation or packaging blocks airflow between zones.
  • 4. Test lower zone sensor:
    • Measure resistance of the lower zone temperature sensor and compare to the upper zone sensor.
  • 5. Replace failed components:
    • Install a new lower zone evaporator fan motor or lower zone temperature sensor as needed.
  • 6. If fan and sensor are good but no cooling:
    • There may be a refrigerant flow issue to the lower evaporator; contact a licensed technician.
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Repair Difficulty

Hard 4/5

Required Part

Lower Zone Evaporator Fan Motor
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