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Grant Aerona R32 fault A0

DC voltage error

Heat pump

What it means

DC voltage error relating to fan motor, pump, reactor or Main PCB circuit.

Likely causes

  1. Fan motor fault
  2. Blown Fuse CF6
  3. Blown Fuse CF7
  4. Pump fault
  5. Reactor fault
  6. Main PCB fault
  7. Power supply issue

Where to start

  1. Check the resistance of Reactor by tester
  2. Operate without lead wire for Fan motor
  3. Check the electric continuity of Fuse by tester

The full answer, free

  • 15 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 55), 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 Grant manual for the Aerona R32. Check the model on the data plate before you order parts.

Other Grant Aerona R32 fault codes