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Riello NXHM fault C7

Transducer module temperature too high protection

Heat pump

What it means

Transducer/inverter module temperature has exceeded safe operating limits.

Likely causes

  1. Water flow rate is low, air in system, or pump head not enough
  2. Water pressure at pump inlet too low
  3. Air remaining in water system during first operation causing malfunction
  4. Air trapped in water system after installation or servicing

Where to start

  1. Check water flow rate and bleed air from system
  2. Purge air from the system
  3. Monitor water flow temperature during preheat (e.g. running 25 minutes, flow temp 20°C)

The full answer, free

  • 11 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 67), 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