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Mitsubishi Ecodan fault 12

Water leakage

Heat pump

What it means

Water leakage from the system, caused by poorly sealed connections or components reaching the end of their service life.

Likely causes

  1. Poorly sealed connections of water circuit components
  2. Water circuit components reaching the end of life

Where to start

  1. Inspect connections of water circuit components for tightness
  2. Check age/condition of water circuit components against expected lifetimes
  3. Follow procedure described in General Operation section for set up operation to access service menu

The full answer, free

  • 12 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 55), 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