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Hitachi Yutaki M & Yutaki S fault 48

Activation of overcurrent protection

Heat pump

What it means

Protection device fault: overcurrent protection has been activated.

Likely causes

  1. Overload
  2. Overcurrent
  3. Failure of Inverter PCB
  4. Heat exchanger clogged
  5. Locked compressor
  6. EVI/EVO failure

Where to start

  1. Check for abnormal activation of the magnetic contactor, auxiliary relay, PCB and others
  2. Check working voltage, working amperage and working phase balance
  3. Check for faulty contact caused by loosened terminal connections, oxidized contacts, foreign matter

The full answer, free

  • 5 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 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.

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