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Riello NXHM fault E0

Water flow fault (after 3 times E8)

Heat pump

What it means

Water flow fault triggered after E8 water flow failure has occurred 3 times.

Likely causes

  1. Water flow rate is too low
  2. Water flow switch is failed, switch is open or close continuously
  3. Water pressure at pump inlet too low
  4. Air remaining in water system during first operation causing malfunction
  5. Air trapped in water system after installation or servicing

Where to start

  1. Check water flow rate
  2. Check water flow switch operation
  3. If AHS is available, turn on first; if requirement for heat pump turn-on is fulfilled, the heat pump will turn on

The full answer, free

  • 13 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 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