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Mitsubishi Ecodan fault 14

In 2-zone temperature control, only Zone2 does not reach the set temperature

Heat pump

What it means

Zone2 fails to reach its set temperature when running 2-zone temperature control, typically because hot water temperature in Zone2 cannot exceed that in Zone1 when both zones are in heating mode.

Likely causes

  1. Normal operation (Zone2 hot water temperature does not exceed Zone1 when both in heating mode)
  2. Faulty wiring of motorized mixing valve
  3. Faulty installation of motorized mixing valve
  4. Incorrect setting of Running time
  5. Motorized mixing valve failure

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. Check wiring of motorized mixing valve per installation manual section 5.3 Wiring for 2-zone temperature control

The full answer, free

  • 18 more checks in order
  • How to put it right, step by step
  • The manual page for this fault (page 56), 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