- HVAC
- Air conditioner
F1
Gree F1 on an air conditioner: indoor ambient sensor fault
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Medium
Quick answer
On Gree split units, F1 means the indoor ambient temperature sensor is open or short-circuited. Gree does not suggest a restart for F1: write the code down and call a qualified professional.
Safety first
Stop and check this first
- Gree asks you not to repair or modify the unit yourself. If the power cord overheats, there is abnormal noise, the breaker trips often, there is a burning smell or the indoor unit leaks, switch off, disconnect the power and call the dealer or a qualified professional.
Safe checks you can perform
- Code on the indoor unit display
- How the unit behaves
- Terminal, sensor and board
Leave these tasks to a qualified professional
- Do not attempt this professional task: Measure the sensor before replacing the board
- 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 sensor before replacing the board
What they doThe technician measures the ambient sensor resistance with a multimeter against Gree's table and checks the terminal.
They must show youthe measured value against Gree's table.
In writingwhich part was replaced, its model and why.
Test in cooling and heating
What they doAfter the repair the technician tests the unit in the modes where F1 stopped it and confirms it does not return.
They must show youthe unit running in both modes.
In writingdate and result of the test.
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 code on the temperature indicator, which blinks when there is an abnormality.
- Result that matters:
- that the code is F1 and not F2.
- If it is F1:
- the indoor ambient temperature sensor is the suspect.
- If it is F2:
- it is the evaporator sensor; look up that page.
- Evidence to keep:
- a photo of the display with the code, date and time.
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
How the unit behaves
- Who:
- you.
- How:
- watch what the unit does with F1 on the display, without opening it.
- Result that matters:
- Gree says that in cooling the indoor unit keeps running with the rest stopped and in heating the complete unit stops.
- If it matches:
- it is the behaviour Gree describes; call a professional, as the manual says.
- If there is a burning smell or the cord is hot:
- switch off, disconnect the power and report that symptom.
- Evidence to keep:
- a note of the mode it was in and what the unit was doing.
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
Terminal, sensor and board
- Who:
- an air conditioning technician.
- How:
- with the power off, follows Gree's chart: reseats the sensor terminal on the board, looks for fallen parts causing a short, measures the sensor against the resistance table and, last, assesses the board.
- Result that matters:
- at which step the fault clears.
- If it clears when reseating the terminal or straightening parts:
- nothing else needs replacing.
- If the sensor measures correctly:
- Gree says to replace the board with one of the same model.
- Evidence to keep:
- a job sheet with the measured sensor value and a photo of the terminal.
Requires opening the indoor unit and working on the board: 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
- anomalía F1 secadora Miele
- Bosch cooktop F1 F6 work surface
- Bosch F1
- Bosch F6
- Bosch hob F6 overheated
- Bosch induction cooktop F1 error
- cocina LG F1 sonda
- DishDrawer F1
- DishDrawer flood fault
- error F1 DishDrawer
- error F1 placa inducción Bosch
- error F6 placa Bosch
- F 1
- F6
- Fisher & Paykel DishDrawer F1
- Fisher Paykel F1
- Gree F1
- Ideal boiler F1
- Ideal boiler F1 low pressure
- Ideal F01
- Ideal F1
- Ideal Logic F1
- lavavajillas Fisher & Paykel F1
- LG F-1 horno
- LG F1 horno
- LG F2 horno termistor
- LG oven F-1
- LG oven F2 thermistor
- LG range F1
- LG range F1 sensor
- Miele dryer F1
- Miele F1 fault tumble dryer
- Miele F1 secadora
- Miele heat pump dryer F1
- Neff F1 placa
- Neff F1 zona sobrecalentada
- Neff F1 zone overheated
- Neff F6 placa
- Neff hob F1
- Neff hob F1 F6
- Neff hob F6
- placa Bosch F1 proteger encimera
- placa Neff F1 F6
- secadora Miele F1 bomba de calor
What it means
Gree shows F1 when the control detects the indoor ambient temperature sensor as open circuit or short circuit. In cooling and drying the indoor unit keeps running and other loads stop; in heating the complete unit stops. Gree lists as causes a loose terminal between sensor and board, a component on the board that fell and causes a short, a damaged sensor or a damaged board. The code does not point to one: the technician separates them.
Warnings and stop conditions
- Highsource verified
Gree asks you not to repair or modify the unit yourself. If the power cord overheats, there is abnormal noise, the breaker trips often, there is a burning smell or the indoor unit leaks, switch off, disconnect the power and call the dealer or a qualified professional.
Evidence: Gree mini split air conditioner installation and owner's manual, Vireo Plus Ultra
Symptoms and causes
Probable causes · in order
- Loose sensor terminal or poor contactPossible
The first thing Gree's chart checks. If F1 clears when the terminal is reseated, the sensor and board were fine.
Evidence: Gree Sapphire installation, service and troubleshooting manual, SAP18HP230V1AH/AO and SAP24HP230V1AH/AO
- Damaged ambient sensorPossible
Confirmed by comparing its resistance with Gree's value table; if it does not match, it is replaced with one of the same model.
Evidence: Gree Sapphire installation, service and troubleshooting manual, SAP18HP230V1AH/AO and SAP24HP230V1AH/AO
- Main boardPossible
Gree includes a fallen component on the board causing a short and a damaged board. Only suspected if terminal and sensor are fine.
Evidence: Gree Sapphire installation, service and troubleshooting manual, SAP18HP230V1AH/AO and SAP24HP230V1AH/AO
Virtual technician
Does F1 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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