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Hitachi Yutaki M & Yutaki S fault 63

Transmission error between central and indoor communication

Heat pump

What it means

Communication transmission error between Central controller and indoor unit. Option configurable from unit controller - displayed if system has been configured.

Likely causes

  1. Indoor fuse meltdown
  2. Indoor/central connection wiring (breaking, wiring error, etc.)

Where to start

  1. Check indoor unit fuse
  2. Inspect indoor/central connection wiring for breaks or wiring errors

The full answer, free

  • How to put it right, step by step
  • The manual page for this fault (page 330), 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