That one catches people out constantly on Free Match and other multi-zone systems, and no amount of filter cleaning will fix it.
Displays that look like faults and are not
GREE labels several codes as status rather than errors:
- E9 - the indoor fan is being deliberately delayed so the unit does not blow cold air while the coil warms. This is the most common "my GREE is on but not heating" report. Wait a few minutes.
- H1 - defrost or oil-return during heating. The outdoor unit may steam and the indoor fan may pause; heating resumes when the cycle finishes. Keep snow and ice clear around the base, but do not chip ice off the coil.
- CL - the Auto Clean drying cycle.
- FO - refrigerant recovery or pump-down mode.
Codes GREE says you can act on
Unusually for a value brand, GREE publishes seven codes with homeowner-level fixes, and most of them come back to airflow:
- E1 (refrigerant pressure too high), E5 (over-current or high load), H4 (system-abnormal protection) and L9 (operating load too high) all share the same first move: clean the indoor filters, keep return and supply air paths clear, and clear leaves, snow or debris from around the outdoor unit.
- P8 means the outdoor inverter module is too hot - clear debris from around the outdoor unit without removing any panels, then reset power once.
- FC is the surprising one: a cover, panel or filter cover is not fully seated, so a position micro-switch is not proving its expected state. Turn the unit off, latch the front panel and filter cover properly, then power back on. If FC returns after that, it is a switch or circuit fault and needs a technician.
Safe checks
- Multi-zone mode conflict (E7 above) if you have more than one head.
- Mode and setpoint - HEAT, not AUTO or FAN, several degrees above room temperature.
- Wait out E9 or H1 before concluding anything is broken.
- Filters, then return and supply air paths indoors.
- Outdoor unit clearance - snow, ice, leaves. Power off before clearing.
- Front panel and filter cover fully latched (FC).
- Know your model's floor - check its rated minimum outdoor temperature in the database. R-32 GREE units vary widely here.
When to stop and call a technician
If a code returns immediately after you have done the airflow work, treat it as a real fault rather than repeating the cycle. Anything not in the list above - and GREE publishes 57 codes in total - is technician territory; look yours up in the GREE error-code library so you can tell them what the unit is reporting.
Call as well if the unit cools normally but never heats (reversing valve), or if the outdoor coil ices over and never clears through a defrost cycle.
Weighing repair against replacement? The installation cost estimator will size the replacement side.