- HVAC
- Air conditioner
F3
Gree F3 on an air conditioner: outdoor ambient sensor fault
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Medium
Quick answer
F3 means the outdoor unit's ambient temperature sensor is open or short circuited. In cooling the compressor stops and the indoor fan keeps running; in heating everything stops. Note the code and mode, and call a technician to measure the sensor.
Safety first
Stop and check this first
- Do not open the outdoor unit. Gree's service manual requires waiting at least 20 minutes after cutting the power, or measuring the capacitor below 20 V, before touching the outdoor board: it is work for a certified technician.
- Gree asks you not to repair the unit yourself and to call a licensed HVAC technician. If the power cord overheats, there is abnormal noise, the breaker trips frequently, there is a burning smell or the indoor unit leaks, turn it off and disconnect the power immediately.
Safe checks you can perform
- Code on the indoor unit display
- Note when and how F3 appears
- Sensor measurement against Gree's table
Leave these tasks to a qualified professional
- Do not attempt this professional task: Measure the outdoor temperature sensor
- Do not attempt this professional task: Test in cooling and heating
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Measure the outdoor temperature sensor
What they doThe technician checks the outdoor sensor connection and measures its resistance against Gree's table before proposing a board replacement.
They must show youthe measured sensor resistance and Gree's table value for that temperature.
In writingthe code, the measurement, the outdoor temperature, the part replaced and why, and the date.
Test in cooling and heating
What they doAfter the repair, the technician tests the unit in both modes, since Gree describes a different stop in cooling and in heating.
They must show youthe unit running in cooling and heating without F3.
In writingtest duration, modes, result and date.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Code on the indoor unit display
- Who:
- you.
- How:
- look at the indoor unit display: Gree shows the error code on the temperature indicator (dual 8). Also note whether the unit was in cooling or heating, because Gree describes a different stop in each mode.
- Result that matters:
- that the code is F3 and which mode it appeared in.
- If it is F3:
- outdoor ambient temperature sensor open or short circuited; continue with this page.
- If it is a different code:
- this page does not apply; look up that code.
- Evidence to keep:
- a photo of the display with the code, date, time and operating mode.
Evidence: Gree Sapphire installation, service and troubleshooting manual, SAP18HP230V1AH/AO and SAP24HP230V1AH/AO · Gree mini split air conditioner installation and owner's manual, Vireo Plus Ultra
Note when and how F3 appears
- Who:
- you, without opening anything.
- How:
- write down whether F3 shows at switch-on, after rain, frost or great heat, and whether the unit keeps blowing air in cooling or stops completely in heating. Do not try to reach the sensor: it is inside the outdoor unit.
- Result that matters:
- a history that helps the technician see whether the fault is intermittent, as a loose connection often is.
- If F3 comes and goes with weather or humidity:
- tell the technician, it points to a connection or wiring.
- If F3 is constant from the start:
- tell them too; the technician will measure the sensor directly.
- Evidence to keep:
- dates, weather, mode and whether the unit kept blowing.
Evidence: Gree Sapphire installation, service and troubleshooting manual, SAP18HP230V1AH/AO and SAP24HP230V1AH/AO
Sensor measurement against Gree's table
- Who:
- certified HVAC technician.
- How:
- with the power cut and the waiting time respected, check the outdoor ambient sensor connection on the board and measure its resistance, comparing it with the 15K ambient sensor table in Gree's manual for the actual outdoor temperature.
- Result that matters:
- whether the sensor reads what it should or is open or shorted.
- If the connection was loose:
- it is reseated and tested without replacing parts.
- If the resistance does not match the table:
- the sensor is replaced with one of the same model.
- Evidence to keep:
- the resistance measured, the temperature it was measured at and the table value.
The outdoor board runs at mains voltage and has capacitors: technician only.
Evidence: Gree Sapphire installation, service and troubleshooting manual, SAP18HP230V1AH/AO and SAP24HP230V1AH/AO
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- HVAC
- Brand
- Gree
- Product type
- Air conditioner
Known code variants
- aire acondicionado Daikin F3
- climatisation Daikin F3
- climatizzatore Daikin F3
- cocina LG F3 panel
- code erreur F3 Daikin
- codice F3 Daikin
- código F3 Daikin
- Daikin AC F3
- Daikin error F3
- Daikin F3
- Daikin Fehler F3
- Daikin Fehlercode F3
- DishDrawer F3
- error F3 Daikin
- error F3 DishDrawer
- errore F3 Daikin
- F 3
- Fisher & Paykel DishDrawer F3
- Fisher Paykel F3
- Gree F3
- Ideal boiler F3
- Ideal boiler F3 fan fault
- Ideal F03
- Ideal F3
- Ideal Logic F3
- Klimaanlage Daikin F3
- LG F-3 horno
- LG F3 horno
- LG F3 touch pad
- LG horno F3 teclas
- LG lightwave F3
- LG microondas F3
- LG microwave F-3 touch panel
- LG microwave F3
- LG oven F-3
- LG oven F3 keypad
- LG range F3
- microondas LG F-3 panel
- panne F3 Daikin
What it means
In Gree's service manual for the Sapphire SAP18 and SAP24HP230V1AH, F3 is the outdoor ambient temperature sensor open or short circuited, detected continuously for 30 seconds. In cooling and drying the compressor stops while the indoor fan runs; in heating the complete unit stops. Gree says the sensor has not been connected well or is damaged, and that it should be checked against the resistance table. The code alone never proves that the sensor is faulty, and other models may differ.
Warnings and stop conditions
- Higheditorial warning
Do not open the outdoor unit. Gree's service manual requires waiting at least 20 minutes after cutting the power, or measuring the capacitor below 20 V, before touching the outdoor board: it is work for a certified technician.
Evidence: Gree Sapphire installation, service and troubleshooting manual, SAP18HP230V1AH/AO and SAP24HP230V1AH/AO
- Highsource verified
Gree asks you not to repair the unit yourself and to call a licensed HVAC technician. If the power cord overheats, there is abnormal noise, the breaker trips frequently, there is a burning smell or the indoor unit leaks, turn it off and disconnect the power immediately.
Evidence: Gree mini split air conditioner installation and owner's manual, Vireo Plus Ultra
Symptoms and causes
Probable causes · in order
- Outdoor sensor connectionCommon
Gree's first cause is that the outdoor temperature sensor has not been connected well to the outdoor unit board.
Evidence: Gree Sapphire installation, service and troubleshooting manual, SAP18HP230V1AH/AO and SAP24HP230V1AH/AO
- Damaged outdoor temperature sensorPossible
If the connection is fine, Gree says to check the sensor against the ambient sensor (15K) resistance table and replace it if it does not match.
Evidence: Gree Sapphire installation, service and troubleshooting manual, SAP18HP230V1AH/AO and SAP24HP230V1AH/AO
Virtual technician
Does F3 still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
Gree Comfort · 2022 · manual
- 2
Gree mini split air conditioner installation and owner's manual, Vireo Plus Ultra
Gree Comfort · 2019 · manual
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