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Grant Aerona R290 fault E01

Connection fault between wiring centre and heat pump

Heat pump

What it means

Displayed on the touch screen display during initial switch on, indicating a communication or connection issue between the wiring centre and the heat pump.

Likely causes

  1. Faulty or loose connection between wiring centre and heat pump
  2. Wire disconnection or wiring error between the heat pump, wiring centre and touch screen display
  3. Fuse on the hydraulic module PCB may have failed
  4. Fuse on the Smart Controller wiring centre PCB may have failed

Where to start

  1. Check wiring between heat pump, wiring centre and touch screen display
  2. Check fuse on hydraulic module PCB
  3. Check fuse on Smart Controller wiring centre PCB

The full answer, free

  • The readings and component tests from the manual
  • How to put it right, step by step
  • The manual page for this fault (page 52), 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.

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