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Hitachi Yutaki M & Yutaki S fault 6

Excessively low voltage or excessively high voltage for the inverter

Heat pump

What it means

Voltage fault for inverter: voltage out of acceptable range.

Likely causes

  1. Voltage drop in power supply
  2. Incorrect wiring
  3. Insufficient capacity of power supply wiring

Where to start

  1. Measure supply voltage to inverter
  2. Check power supply wiring sizing and connections

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