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Grant Aerona R290 fault E57

Gas sensor offline

Heat pump

What it means

Gas sensor is reported offline / not communicating.

Likely causes

  1. Cables incorrectly connected
  2. Refrigerant & Drive PCB is faulty

Where to start

  1. Check all connections from the Refrigerant PCB (or Refrigerant & Drive PCB for the 16kW model)

The full answer, free

  • How to put it right, step by step
  • The manual page for this fault (page 61), 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