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Mitsubishi Ecodan fault U2

Applicable error for automatic backup heat source operation

Heat pump

What it means

One of the error codes listed as applicable for automatic switch to backup heat source operation when the outdoor unit stops abnormally.

Likely causes

  1. Outdoor unit abnormal stop triggers automatic backup operation

Where to start

  1. Check for error code and contact number displayed alternately on remote controller
  2. Check DIP SW2-5 setting to confirm backup operation is enabled (ON)
  3. Observe remote controller display for alternating error code and contact number

The full answer, free

  • 1 more check in order
  • How to put it right, step by step
  • The manual page for this fault (page 17), 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