HVACopediaGree · Mini-split · Defrost
Automatic defrost
What happens, in order
- Defrost is considered after 45 minutes of continuous heating or 90 minutes of accumulated heating, when the outdoor coil is cold enough for the outdoor air temperature (for example air at 41F or above with coil at 28.4F or lower)
- Defrost starts 3 minutes after the conditions are met
- Indoor fan and compressor stop; 60 s later the outdoor fan stops
- 30 s later the reversing valve switches
- 30 s later the compressor starts and ramps to defrost frequency (70 Hz)
- After 10 minutes, or when the outdoor coil reaches 50F, the compressor drops to 46 Hz
- 30 s later the compressor stops; 30 s after that the reversing valve switches back
- 60 s later the compressor and outdoor fan restart; indoor fan resumes under anti-cold-air rules; H1 shows on the display
Timings and thresholds
| Item | Value |
|---|---|
| Heating run before defrost | 45 min continuous or 90 min accumulated |
| Delay after conditions met | 3 min |
| Defrost frequency | 70 Hz |
| Maximum defrost time | 10 min |
| Exit frequency | 46 Hz |
Codes you may see during this
H1
Applies to: Gree Livo GEN4 wall mini-split heat pumps 30k-36k
Models
More Gree mini-split sequences
- Compressor restart delay and minimum run time · Startup
- Anti-cold-air indoor fan delay · Heating
- Heating mode · Heating
- Heating mode (outdoor logic) and special modes · Heating
- Heating mode and anti-cold-air · Heating
- Heating, defrost, oil return and mode conflict · Heating
- Cooling and dry mode (multi-zone) · Cooling
- Cooling and dry mode with protections · Cooling
Related
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Source: Gree Livo GEN4 30-36k service manual (4LIV30-36HP230V1A), Technical Information - Function and Control. Written in our own words; timings can differ by model and software version, so check the manual for your exact unit.
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.