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Riello NXHM fault E2

Communication fault between controller and hydraulic module

Heat pump

What it means

Communication failure between the wired controller and the hydraulic module.

Likely causes

  1. Faulty or disconnected wiring between user interface and unit
  2. Wire doesn't connect between wired controller and unit
  3. Communication wire sequence is not right

Where to start

  1. Check the wiring connections between the user interface and the unit
  2. Check wire connection between wired controller and unit
  3. Check communication wire sequence

The full answer, free

  • 1 more check 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 64), 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