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Gree · Heat pump

F0 Low refrigerant / refrigerant blocked protection

High severity Gree SapphireGree Livo GEN4Gree Multi21+

What the control is telling you

The control sees signs of a refrigerant shortage or blockage and shuts the unit down. Multi21+ lists it as not used on residential outdoor units.

Applies to: Gree Sapphire 9-24k (SAP..HP230V1A), Livo GEN4 30-36k (4LIV..HP230V1A), Multi21+ 18-24k multi-zone (MULTI..HP230V1CO)

Likely causes

  • Refrigerant leak or low charge
  • Service valves not fully open
  • Indoor coil or outdoor coil sensor loose
  • Capillary or EEV blocked
  • Cooling in very humid conditions (small temperature split)
  • Dirty coils or blocked airflow

Test and repair steps

  1. Make sure both service valves are fully open.
  2. Check the indoor coil and outdoor coil sensors are seated and reading right.
  3. Leak-check the system and charge to the nameplate amount after repair.
  4. Clean the coils and clear the air inlet and outlet.
  5. Look for restrictions (debris, ice, oil, EEV/capillary) and clear them.
  6. If the code persists with a good charge, replace the board.

Models that show this code

8 models in Gree Sapphire, Gree Livo GEN4, Gree Multi21+

4LIV30HP230V1AH4LIV36HP230V1AHMULTI18HP230V1COMULTI24HP230V1COSAP09HP230V1AHSAP12HP230V1AHSAP18HP230V1AHSAP24HP230V1AH

Other codes on the same units

  • E6 Indoor/outdoor communication fault
  • E7 Mode conflict between indoor units (status)
  • E8 High temperature / overload protection
  • E9 Cold air prevention (status)
  • F1 Indoor room air sensor open or shorted
  • F2 Indoor coil sensor open or shorted
  • F3 Outdoor ambient sensor open or shorted
  • F4 Outdoor coil (condenser middle) sensor open or shorted

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Source: Gree Sapphire 9-12k (SAP09-12HP230V1A) service.pdf - section 9.1 Error Code List / 9.2 Procedure of Troubleshooting; Gree Sapphire 18-24k (SAP18-24HP230V1A) service.pdf - section 9.1 Error Code List / 9.2 Procedure of Troubleshooting; Gree Livo GEN4 30-36k (4LIV30-36HP230V1A) service.pdf - section 9.1 Error Code List / 9.2 Procedure of Troubleshooting; Gree Multi21+ multi-zone 18-24k (MULTI18-24HP230V1CO) service.pdf - section 9.1 Malfunction status sheet / 9.2 Malfunction Checking and Elimination. Summarized in our own words; check the original manual for your model.

Homeowner looking at this code? See what it means for you and when to call a technician.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.