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Riello NXHM fault E7

Buffer tank up temp. sensor (Tbt1) fault

Heat pump

What it means

Fault with the buffer tank upper temperature sensor Tbt1.

Likely causes

  1. Sensor resistance out of range
  2. Tbt1 sensor connector loosened
  3. Tbt1 sensor connector wet or has water ingress
  4. Tbt1 sensor failure
  5. Volume of tank too small
  6. Location of water temperature probe (T5) not high enough

Where to start

  1. Check the resistance of the sensor
  2. Check if Tbt1 sensor connector is loosened
  3. Check if connector is wet or has water in it

The full answer, free

  • 6 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.

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