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Hitachi Yutaki M & Yutaki S fault 35

Incorrect indoor unit number setting

Heat pump

What it means

System fault: indoor unit number has been set incorrectly.

Likely causes

  1. Duplication of indoor unit number
  2. Number of indoor units over specifications

Where to start

  1. Check cabinet for stains and clean if necessary
  2. Check for peeled thermal insulator on indoor part of covers; repair if needed
  3. Check for water leakages in inlet/outlet water connections (space heating and DHW), main water circuit and tank connections

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 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