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Hitachi Yutaki M & Yutaki S fault 100

Indoor-LCD compressor protection

Heat pump

What it means

Compressor failure alarm. This alarm code appears when alarms 02, 07, 08, 45, 47 occur three times within 6 hours. Shown in the outdoor unit with alarm code 'EE'.

Likely causes

  1. Repeated occurrence of alarms 02, 07, 08, 45, 47 within 6 hours
  2. Alarms 02, 07, 08, 45, or 47 occurring three times within 6 hours

Where to start

  1. Check history of alarms 02, 07, 08, 45, 47 for repeated occurrences within 6 hours
  2. Set pump down duration
  3. Start pump down procedure

The full answer, free

  • 8 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 335), 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