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Hitachi Yutaki M & Yutaki S fault 40

Incorrect LCD setting

Heat pump

What it means

Current LCD configuration does not allow proper operation.

Likely causes

  1. Current LCD configuration does not allow proper operation
  2. Incorrect current LCD configuration

Where to start

  1. Check LCD/controller configuration settings against unit requirements
  2. Observe arrow rotation direction: anti-clockwise in Heating mode, clockwise in Cooling mode, to confirm correct mode operation.
  3. Check pipe colour between exchangers: pink indicates operating, gray indicates unit in thermo off.

The full answer, free

  • 9 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.

Other Hitachi Yutaki M & Yutaki S fault codes