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Grant Aerona R290 fault E25

Current detection circuit failure

Heat pump

What it means

Failure detected in current detection circuit.

Likely causes

  1. Cables incorrectly connected
  2. Refrigerant & Drive PCB is faulty
  3. Flow regulators or restrictors fitted in circuit
  4. Valves not fully open causing flow restriction

Where to start

  1. Check all connections from the Refrigerant PCB (or Refrigerant & Drive PCB for the 16kW model)
  2. Check for presence of flow regulators or restrictors in the system and remove if found
  3. Verify all valves in the circuit are fully open

The full answer, free

  • 25 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 60), 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 R290. Check the model on the data plate before you order parts.

Other Grant Aerona R290 fault codes