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Hitachi Yutaki M & Yutaki S fault 80

Indoor LCD H-link RCS transmission error

Heat pump

What it means

No H-link communication for a continuous period of 1 minute between indoor unit and LCD user control, caused by connection wiring issue (breaking, wiring error, etc.) or LCD having no power if no H-LINK RCS.

Likely causes

  1. Connection wiring breaking
  2. Connection wiring (breaking, wiring error, etc.)
  3. LCD has no power (if no H-LINK RCS)

Where to start

  1. Check H-link wiring between Indoor unit and LCD User control for breaks or wiring errors
  2. Check power supply to H-LINK RCS
  3. Check cabinet for stains and clean if necessary

The full answer, free

  • 19 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 336), 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.

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