Transtherm Lower Zone Cooling Failure

Upper zone cools but lower zone is warm in a dual-zone Transtherm cabinet

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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, Faulty lower zone temperature sensor, Control board not activating lower zone valve or damper (if equipped)

How to Fix / Troubleshooting

Safety: Unplug the cabinet before accessing internal fans or ducts.

Steps:

  • Check airflow: Feel for airflow in the lower zone vents when the unit is running. Lack of airflow suggests a fan or duct issue.
  • Inspect lower fan: Remove the lower rear interior panel and check the lower evaporator fan. Replace the lower zone evaporator fan motor if not operating.
  • Clear ducts: Ensure no bottles or shelves are blocking the air passages between zones.
  • Check lower sensor: Inspect and test the lower zone NTC sensor; replace if faulty.

Technician note: If the model uses an electronic damper or valve to control lower zone cooling, a failed actuator or control board may be the cause and should be serviced professionally.

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Repair Difficulty

Hard 4/5

Required Part

Lower Zone Evaporator Fan Motor
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