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Trianco High Temperature Air Source Heat Pump R290 fault F15

Input voltage lacking phase

Heat pump

What it means

Input voltage lacking phase fault.

Likely causes

  1. Compressor Issue
  2. Fan not running or speed is too low
  3. Refrigerant leak
  4. Loose screws
  5. Fan blade or motor issue
  6. Touching components
  7. EEV step is not suitable
  8. Refrigerant amount incorrect
  9. Parameter Issue

Where to start

  1. Check the phase of power supply R/S/T to compressor driver board
  2. If it's OK, replace a new compressor driver board
  3. Check correct operation of Compressor

The full answer, free

  • 16 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 36), right under the answer
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Safety: Isolate the outdoor unit 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 Trianco manual for the High Temperature Air Source Heat Pump R290. Check the model on the data plate before you order parts.

Other Trianco High Temperature Air Source Heat Pump R290 fault codes