Error-code hub
TOSOT is GREE's sibling brand and shares its diagnostic scheme, so the 14 codes below closely follow GREE's set. Our TOSOT coverage is multi-zone only, so several codes here relate to zone communication and to which head is reporting the fault. If your code is not listed, the GREE pages cover a larger set from the same platform.
Unit applicability
This table is sourced for Multi Ultra Heat. If your unit is a different generation or product line not named here, the same display code may vary by generation.
Common codes first
Ranking basis: we do not have failure-frequency telemetry. These are ordered by breadth of affected systems in the SplitAtlas catalog - the documented product line's published model count, whether the same code appears on more than one product line, and any manual applicability notes we hold. This is a breadth ranking, not a popularity claim.
E2 means the system is protecting itself because the indoor coil is getting too cold or conditions suggest freezing. The safe homeowner focus is airflow, not refrigerant service.
E5 means the unit has detected current draw outside the allowed range. TOSOT Direct connects this code with power stability and blocked indoor or outdoor airflow.
E6 means the indoor and outdoor controls are not exchanging the expected signal. TOSOT Direct calls this a communication malfunction and points to the line connection between the indoor and outdoor units.
E8 means the system has protected itself from a high-temperature or overload condition. TOSOT Direct pairs this with H3 in homeowner guidance and points first to restricted airflow and overheating.
F0 means the unit has detected a refrigerant-side protection condition. TOSOT Direct describes this as refrigerant leakage protection or cut-off protection, commonly tied to low refrigerant or a possible leak.
F1 is in TOSOT Direct's temperature sensor malfunction group. The unit may stop because it cannot trust a temperature reading needed for safe control.
Safe first checks
These codes have homeowner-safe steps such as filters, airflow, condensate/drain checks, remote/controller items, or a single safe power reset. If the code returns, stop at the boundary in the card.
Turn cooling off, let any ice melt, clean the indoor filter, and make sure furniture or curtains are not blocking airflow. Restart once after the coil is thawed.
Read the full code guidePower the system off, clean the indoor filter, and make sure the outdoor unit has clear space around it. Restart once only after the unit has cooled.
Read the full code guideTurn the system off for 10 minutes, then restart once. Keep the outdoor unit clear of debris, but do not open the cabinet.
Read the full code guideTurn the system off for at least 10 minutes, clean the filter, and clear debris from the outdoor coil area. Do not open the cabinet or bypass any protection.
Read the full code guideUse the TOSOT catalog to connect these manual error codes to current model pages and replacement options.
Multi Ultra Heat
Multi Ultra Heat
Multi Ultra Heat
Multi Ultra Heat
Multi Ultra Heat
Multi Ultra Heat
E2 means the system is protecting itself because the indoor coil is getting too cold or conditions suggest freezing. The safe homeowner focus is airflow, not refrigerant service.
E5 means the unit has detected current draw outside the allowed range. TOSOT Direct connects this code with power stability and blocked indoor or outdoor airflow.
E6 means the indoor and outdoor controls are not exchanging the expected signal. TOSOT Direct calls this a communication malfunction and points to the line connection between the indoor and outdoor units.
E8 means the system has protected itself from a high-temperature or overload condition. TOSOT Direct pairs this with H3 in homeowner guidance and points first to restricted airflow and overheating.
F0 means the unit has detected a refrigerant-side protection condition. TOSOT Direct describes this as refrigerant leakage protection or cut-off protection, commonly tied to low refrigerant or a possible leak.
F1 is in TOSOT Direct's temperature sensor malfunction group. The unit may stop because it cannot trust a temperature reading needed for safe control.
F2 is part of TOSOT Direct's temperature sensor malfunction group. It means the unit is seeing an invalid temperature input and may shut down to protect itself.
F4 is in TOSOT Direct's temperature sensor malfunction group. It usually points to an outdoor temperature or coil sensor circuit that the unit needs for safe operation.
H3 means the compressor protection circuit has stopped operation because the system is overloaded or overheating. Restricted airflow is the main safe homeowner item to rule out.
H5 means the outdoor inverter power module has protected itself from an abnormal electrical or load condition. TOSOT Direct calls this IPM protection and points homeowners first to airflow and power stability checks.
H6 means the indoor unit does not see expected fan motor feedback. TOSOT Direct describes it as the internal fan motor not operating or no feedback from the indoor fan motor.
H7 means the inverter lost normal synchronization with the compressor. TOSOT Direct describes common triggers as voltage fluctuation or pressure imbalance.
L3 means the outdoor unit is not getting the expected feedback or operation from the DC fan motor. TOSOT Direct lists condenser dirt, fan obstruction, and connector issues as common checks.
PL means the inverter has detected low DC bus voltage. TOSOT Direct describes this as a low-voltage protection tied to low or unstable power supply.