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Hitachi Yutaki M & Yutaki S fault 2

Activation of protection device (high pressure cut)

Heat pump

What it means

Outdoor unit alarm triggered by activation of the high pressure protection device.

Likely causes

  1. Failure of fan motor
  2. Excessive refrigerant
  3. Fan motor locking at cooling operation

Where to start

  1. Check fan motor operation
  2. Check for pipe clogging or refrigerant overcharge

The full answer, free

  • The readings and component tests from the manual
  • The manual page for this fault (page 338), 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