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Hitachi Yutaki M & Yutaki S fault 8

Excessively high discharge gas temperature at the top of compressor

Heat pump

What it means

Cycle fault: discharge gas temperature at the compressor top is excessively high.

Likely causes

  1. Insufficient refrigerant charge
  2. Refrigerant leakage
  3. Expansion valve closed or clogged

Where to start

  1. Set pump down duration
  2. Start pump down procedure
  3. Check for abnormal activation of the magnetic contactor, auxiliary relay, PCB and others

The full answer, free

  • 7 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.

Other Hitachi Yutaki M & Yutaki S fault codes