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Mitsubishi Ecodan fault 1

Main remote controller display is blank

Heat pump

What it means

The main remote controller shows no display at all, indicating either no power supply to the controller or a display failure despite power being present.

Likely causes

  1. Fault with the main remote controller circuit board
  2. No power supply to main remote controller
  3. Disconnection between main remote controller cable and FTC control board
  4. Failure of the main remote controller
  5. Power supplied but display fault

Where to start

  1. Press CONFIRM
  2. Press F3 and F4 buttons to select refrigerant address, press CONFIRM (multiple outdoor units only)
  3. Use F2 and F3 buttons to set pump speed between 1 and 5

The full answer, free

  • 24 more checks in order
  • The readings and component tests from the manual
  • How to put it right, step by step
  • The manual page for this fault (page 53), right under the answer
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Safety: Isolate the outdoor unit and any backup heater, and give the inverter capacitors time to discharge before you open the electrics. Anything on the refrigerant circuit needs F-gas certification.

From the Mitsubishi manual for the Ecodan. Check the model on the data plate before you order parts.

Other Mitsubishi Ecodan fault codes