• E4 Code
  
  
  The manual says the E4 code means: Error of DC electric fan for the lower zone.
  
  Hope this helps.
  
  
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• E3 Code
  
  
  Anyone knwo what the E3 code might mean?
  
  
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• Error Codes
  
  
  Abnormal display on control panel
  “E1” on display for upper zone – error of temperature sensor for upper zone.
  “E2” on display for lower zone – error of temperature sensor for lower zone.
  “E3” on display for upper zone – error of DC electric fan for upper zone.
  “E4” on display for lower zone – error of DC electric fan for lower zone.
  If any of above errors happens, please contact Customer Service Dept. for further assistance. Do not attempt to repair it yourself.
  
  
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