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Hitachi Yutaki M & Yutaki S fault 203

Sub PC-ARFH2E stops answering to main PC-ARFH2E

Heat pump

What it means

LCD-origin alarm: the sub PC-ARFH2E controller has stopped responding to the main PC-ARFH2E controller. Applies to YUTAKI S/SC (o).

Likely causes

  1. Loose, disconnected, broken or short-circuited connector
  2. Loose connector
  3. Disconnected connector
  4. Broken connector

Where to start

  1. Check connector condition between master and slave PC-ARFH1E
  2. Check connector between Sub PC-ARFH2E and Main PC-ARFH2E for loose, disconnected, broken or short-circuited condition

The full answer, free

  • How to put it right, step by step
  • The manual page for this fault (page 338), 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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