HVACopediaGree · Heat pump
H1 Defrost or oil return (status)
What the control is telling you
Not a fault. The outdoor unit is defrosting or returning oil in heating; it ends on its own (oil return runs about 5 min).
Applies to: Gree Multi21+ 18-24k multi-zone (MULTI..HP230V1CO)
Test and repair steps
- Wait for the cycle to finish.
- If it repeats constantly, check the outdoor coil sensor and airflow.
Models that show this code
2 models in Gree Multi21+
Other codes on the same units
- F2 Indoor coil sensor open or shorted
- F3 Outdoor ambient sensor open or shorted
- F4 Outdoor coil (condenser middle) sensor open or shorted
- F5 Compressor discharge sensor open or shorted
- H3 Compressor overload protection
- H5 IPM (inverter module) protection
- H6 Indoor fan motor not running / no feedback
- H7 Compressor lost synchronism
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Source: 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.