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Grant Aerona R290 fault P01

Air in system or low water level

Heat pump

What it means

Displayed on the touch screen display during initial switch on, indicating a possible air ingress in the system or that the water level in the system is below the required minimum.

Likely causes

  1. Air trapped in the system
  2. Water level in system less than the required minimum

Where to start

  1. Check system water level
  2. Bleed air from system via automatic air vent

The full answer, free

  • 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.

Other Grant Aerona R290 fault codes