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Mitsubishi Ecodan fault UP

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. Follow procedure described in General Operation section for set up operation to access service menu
  2. Use F1 and F2 buttons to scroll through the 16 service functions across two screens
  3. Turn OFF water supply, drain DHW tank, remove mesh from strainer, clean and replace in strainer

The full answer, free

  • 27 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 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