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Hitachi Yutaki fault 54

Abnormality of inverter fin temperature

Heat pump

What it means

Inverter abnormality related to inverter fin temperature, associated with heat exchanger clogging and fan motor failure.

Likely causes

  1. Heat Exchanger Clogging
  2. Fan Motor Failure

Where to start

  1. Check Water Outlet PHEX Temperature
  2. Check Water Flow Level and Water Pump Speed
  3. Check Outdoor Ambient temperature and Outdoor Ambient 2 temperature

The full answer, free

  • 11 more checks in order
  • The manual page for this fault (page 85), 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. Check the model on the data plate before you order parts.

Other Hitachi Yutaki fault codes