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Hitachi Yutaki M & Yutaki S fault 5

Reception of abnormal operation code for detection of power source phase

Heat pump

What it means

Power supply fault: abnormal power source phase detection code received.

Likely causes

  1. Power source with abnormal wave pattern
  2. Reversed phase connection
  3. Missing phase connection
  4. Main power supply phase reversely connected
  5. One phase not connected

Where to start

  1. Check power source wave pattern
  2. Check phase connection order
  3. Check for missing phase

The full answer, free

  • The readings and component tests from the manual
  • How to put it right, step by step
  • The manual page for this fault (page 337), 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 Hitachi manual for the Yutaki M & Yutaki S. Check the model on the data plate before you order parts.

Other Hitachi Yutaki M & Yutaki S fault codes