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Riello NXHM fault E1

Phase loss or neutral wire and live wire connected reversely (three phase unit only)

Heat pump

What it means

Phase loss detected, or neutral and live wires reversed, applicable to three phase units only.

Likely causes

  1. Power supply cables not connected stably causing phase loss
  2. Sequence of neutral wire and live wire connected reversely

Where to start

  1. Check power supply cables are connected stably to avoid phase loss
  2. Check whether the sequence of neutral wire and live wire are connected reversely
  3. Measure voltage between CL and COM: 12VDC indicates cooling mode request (Method A)

The full answer, free

  • 5 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 66), right under the answer
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Safety: Isolate the heat pump 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 Riello manual for the NXHM. Check the model on the data plate before you order parts.

Other Riello NXHM fault codes