Error codes F1 and F6 in air conditioning systems are generally related to issues with the exterior air temperature sensor that passes through the condenser. These codes typically appear on the control panel of the unit.
Function of the exterior temperature sensor
The exterior temperature sensor provides crucial data to the control board about the temperature of the air entering the condenser. This information helps regulate the operation of the compressor, which is responsible for circulating the refrigerant throughout the system.
Common causes of F1 and F6 errors
These errors are usually due to a defective temperature sensor, which may have the following issues:
- Loose or improperly positioned sensor.
- Damaged or worn-out cables.
- Short circuit or open connection.
- Uncalibrated sensor.
- Failure in the control board.
Steps to diagnose and fix the problem
- Visual inspection of the sensor and cables
- Check the sensor’s position to ensure it is correctly placed at the measuring point.
- Inspect the cables for any signs of damage, corrosion, or loose connections.
- Testing the sensor with a multimeter
- Disconnect the sensor from the control board before performing any tests.
- Set the multimeter to resistance mode, on the kilo-ohm scale.
- Measure the sensor’s resistance; it should change depending on the temperature.
- To test, rub the sensor with your hand to warm it slightly; the resistance should change.
- Compare the obtained reading with the values listed in the equipment’s maintenance manual.
- If the resistance is outside the manufacturer’s specifications, the sensor needs to be replaced.
- Replacing the defective sensor
- After diagnosing the problem, remove the defective sensor and replace it with a new one compatible with the unit’s model.
- Ensure the sensor is tightly secured to prevent it from loosening over time.
- Checking the power supply to the sensor
- With the sensor connected, measure the voltage using the multimeter in direct current (DC) voltage mode.
- The voltage should be around 2.5 V. If not, the issue might lie with the control board.
Important considerations
- The sensor reading should never be zero (indicating a short circuit) or infinite (indicating an open circuit). It should always provide a value within the specified range.
- If the problem persists after replacing the sensor, the issue is likely with the control board, which may need to be inspected or replaced.
