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Riello NXHM fault PD

High temperature protection of refrigerant outlet temp of condenser

Heat pump

What it means

Refrigerant outlet temperature of the condenser has exceeded safe limits.

Likely causes

  1. Heat exchanger cover is not removed
  2. Heat exchanger is dirty or blocked
  3. Not enough space around the unit for heat exchanging
  4. Fan motor is broken
  5. Wear, corrosion, excessive pressure, vibration, sharp edges
  6. Aging or continual vibration from compressors or fans

Where to start

  1. Check if heat exchanger cover has been removed
  2. Inspect heat exchanger surface for dirt or obstruction
  3. Check clearance space around unit

The full answer, free

  • 3 more checks in order
  • 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