HVACopediaGree · Mini-split · Other
Compressor protections and lockouts
What happens, in order
- Overload (coil temperature) and discharge temperature protections: frequency is raised when cool, held or reduced when warm, and the compressor stops when too hot
- If the same protection appears 6 times in a row, the compressor will not restart until power is cut and restored; the count clears if the compressor ran more than 7 minutes
- High-pressure switch open for 3 s compressor stops and a high-pressure signal goes to the indoor units; once the switch has been closed 6 s, restart still needs a power cycle
- Compressor overload switch trips indoor unit shows the fault and compressor stops; if the compressor has been off more than 3 minutes and the switch resets, it restarts automatically
- If the overload switch trips more than 6 times (count clears after 30 minutes of running), automatic restart is blocked until power is cycled
- On power-up, an indoor unit that has not communicated within 3 minutes is treated as not installed
Timings and thresholds
| Item | Value |
|---|---|
| Repeat trips before lockout (discharge/overload coil) | 6 |
| Counter reset (those) | Compressor run over 7 min |
| Overload switch restart | Off over 3 min and switch reset |
| Overload switch lockout | More than 6 trips |
| Overload switch counter reset | Run over 30 min |
| High-pressure detect | 3 s open |
| Indoor unit detection | 3 min after power-up |
Applies to: Gree Multi21+ multi-zone heat pump outdoor units
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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Sequences of operation, error codes and tips work offline in the HVACopedia app.
Source: Gree Multi21+ multi-zone service manual (MULTI18-24HP230V1CO), Function and Control sections 1 and 2. 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.