Is your Airfel air conditioner or boiler system suddenly failing to operate, leaving you staring at a confusing combination of blinking Green and Red LED lights? In the middle of a harsh weather shift, a malfunctioning system is highly stressful, but those flashing lights are actually your unit’s built-in self-diagnosis system pinpointing the exact failure.
Unlike standard air conditioners that show alphanumeric codes (like E1 or F2) on a digital display, Airfel systems utilize a 3-LED interface (Left Green, Middle Red, Right Green). Whether you are dealing with low closed-circuit water pressure (Left Green blinking, Red ON), a clogged condenser pump (All LEDs ON), or a tripped frost protection mode (Green and Red blinking out of sync), decoding these Airfel light patterns quickly can save you from unnecessary panic and expensive service calls.
Instead of scrolling through dense technical manuals trying to decipher the blinks, use our Interactive Airfel LED Diagnostic Decoder below. Simply select your exact LED pattern to instantly reveal the hidden cause and the step-by-step DIY solution.
Select your 3-LED light pattern below for instant diagnostics.
(Left Green | Middle Red | Right Green)
💡 How to Read Airfel LEDs:
- ON L: Blinking Fast (0.5 seconds ON, 0.5 seconds OFF)
- ON L1: Blinking Slow (5 seconds ON, 0.2 seconds OFF)
- ON / OFF: Solid Light / No Light
⚠️ Pro Safety Tip: While issues like turning off a scheduled “Reset Mode” or waiting for the “Frost Protection” cycle to finish are safe DIY fixes, errors involving the boiler flame ignition, exhaust system failure, or corrupted system configurations should always be handled by our licensed HVAC engineers to prevent hazards.
A few Notes:
- 1st Green LED is on the left side of the 3 LEDs
- Red LED is in the middle of the 3 LEDs
- 2nd Green LED is on the right side of the 3 LEDs
- ON L means 0.5 seconds ON – 0.5 seconds OFF
- ON L1 means 5 seconds ON – 0.2 seconds OFF
Airfel air conditioner light blinking
Causes:
- The closed-circuit water pressure of the system is low.
- The system has initiated the protection mode because of low pressure.
Solutions:
If the error is in the boiler system:
- Fill the water in the boiler until it reaches the required or certain level.
- Ensure that the boiler has no clogging and the closed circuit is working fine.
If the error is in the air conditioner unit:
- Inspect the ducts and ensure they are the correct size. Replace and correct them if they are small or wrongly installed.
- Clean ducts and ensure no dirt, debris, or water stuck in there is causing clogging. Do a general cleaning of the system as well.
- Check the pressure switch and main PCB for any malfunction. Replace either of the components if it is faulty.
Causes:
This error is solely related to the boiler and can occur when/if:
- The flame is not initiated even though the ignition is working fine.
- The boiler is unable to kick start the heating because of no flame.
Solutions:
- Check and ensure that the electrical fuse and circuits are fine. Replace the fuse if it is blown.
- Reset the tripped breaker within the system.
- Ensure the correct temperature and water level in the system.
- Contact an HVAC engineer to inspect the system and make fixes as needed.
Don’t jump into the system heating and eclectic components if you don’t have enough knowledge and experience. Always seek professional help to prevent any health hazards for you and the heating system.
Causes:
- An incorrect thermostat (too high or too low) is set for the system to run.
- The unit is shutting down because of the wrong thermostat.
- The system has shut down because of the thermostat’s safety feature.
Solutions:
- Check thermostat settings and reset them as you like. If the automated thermostat settings are set, the system will shut down automatically at a certain time.
- Ensure the right temperature for the system because too high temperature can stop the system from working to prevent any major issues.
- Ensure nothing is in the room emitting too much heat.
Causes:
- The exhaust system is malfunctioning or completely failed.
- The exhaust gas is failing.
Solutions:
- Change the thermostat to a high or lower level to see if the error resolves.
- Clean the air filters and exhausts to remove objects and dirt causing blockages. Ensure the air has no restriction to go in or out of the system.
- Check the refrigerant or gas level in the system and get a refill if it is less than required.
- Check the exhausts and ensure there aren’t any leaks. Seek engineers to repair leakages if there are any.
Causes:
- The heater water temperature sensor is defective.
- The wire harness of the water temperature sensor of the heater is defective.
- The sensor is displaced or bent from its intended position.
- The sensor is covered with dust or another object is restricting its detection.
Solutions:
- Change the temperature and ensure the thermostat is working fine. Repair the thermostat if it is malfunctioning.
- Check and ensure that the sensor is placed in its intended position.
- Ensure nothing is blocking the sensor vision and it has a clear path to the area it is detecting.
- Check the coefficient resistance of the sensor and replace it if the system needs a sensor with higher resistance.
- If the error remains, contact an HVAC engineer to inspect the main PCB and replace it if it is defective.
Always make sure that you turn OFF the air conditioner and unplug its electrical or power cord. The sensor is located in between various electrical components. So, it’s better to work safely instead of getting injuries or damaging the system.
Causes:
- The water usage temperature sensor is defective.
- The sensor is displaced or bent.
- The sensor is covered with dust or another object is restricting its vision.
- The main PCB is malfunctioning.
Solutions:
- Try the exact solutions suggested for the Airfel air conditioner error code Green LED: OFF, Red LED: ON L, Green LED: ON L, or for the heater water temperature sensor.
Causes:
- The system has improper ionization.
- The ionizer of the air conditioner is malfunctioning or completely failed.
Solutions:
- Check the settings and ensure that the ionizer is working. Turn it ON if it was OFF previously.
- If that does not resolve the error, contact an engineer from an authorized service provider to inspect the ionizer, wire harness, and related components for issues. Do repairs or replacements as needed.
Causes:
This is a boiler configuration error and occurs when if:
- The boiler configuration is corrupted.
- The configuration needs to be reinstalled or corrected.
Solutions:
- Contact an authorized service provider to check and resolve the errors in the system’s configuration.
- If the configuration is completely corrupted, re-install the configuration and reset the program.
- Ensure that the permanent memory chip is fine. Replace the board if it is defective.
- Contact an installation engineer to inspect and system and ensure everything is installed in its intended location.
Causes:
- The pump of the system is clogged.
- The condenser of the unit is clogged.
Solutions:
- Clean the pump and remove debris, dirt, and foreign particles stuck in there. Retest the system and see if the error resolves.
- Clean the filters in the pump and replace them if they are damaged.
- If the error remains, check the pump for defects. Repair or replace the pump as required.
Causes:
- This is not an error but an indication that the system is under the Flue Kit Mode also known as Test Mode.
Solutions:
- Wait for a few minutes as this error can be taken down once the test mode or flue kit mode completes.
- Check the flue kit and ensure nothing is stuck in there. Remove any blockages in the exhaust, chimney, or exit scenario of the system.
- Ensure there aren’t any leaks in the flue kit-related components. Seek professional help to repair leaks when needed.
Causes:
- This error indicates the heater system demand.
- The main heating components of the system have gone bad.
- The water or gas is not as much in the water as required for the heater to operate.
- The main PCB is giving wrong readings about the heater system.
- The heater system itself is faulty.
Solutions:
- Check and ensure the required level of water in the heater system.
- Check the primary circuit water pressure and ensure it is at an adequate level (mostly 0.8 bars). Seek professional help if it’s lower or higher.
- Check the primary circuit flow control pressure switch and replace it if it is defective.
- Check the main PCB and replace it if it is malfunctioning.
- If the error remains, check the heater system. Repair or replace the faulty components.
Causes:
- This error indicates the usage of water demand in the system.
- Water pressure is less than required.
Solutions:
- By keeping the pressure gauge in front, add more water into the system until it reaches a good level between 1-2 bars (it varies from system to system or even type such as a boiler and an air conditioner).
- If the error remains even after adding water, look for any leaks in the system and call for a repair immediately.
Causes:
- The system is under the frost protection application for the heater circuit.
- There is icing or the heater circuit system has become too cold to operate safely.
Solutions:
- Turn off the system and let the icing melt from the coils or the respective components.
- Run the fans at full speed to direct air to the ice and speed up the melting process.
- If the frost is not going anywhere, unplug the power cord and remove the ice using a soft brush or dull scraper. Be gentle while working on components like coils that can easily be damaged.
Causes:
- The system is under the OFF/RESET mode.
- The system is scheduled to turn OFF or RESET at a specific hour of the day.
Solutions:
- Go to the remote controller settings and remove any schedule you have put in mistakenly. Select the hour or time and click “Clear” to remove the settings.
- Change different modes or simply switch the system to “ON” mode.
- If the error remains, reset the settings to default or what you remember when the AC/boiler was working fine.
Causes:
- This is not an error but an indication that the system is on the WINTER/HEAT mode and the usage water mode is also running on standby.
Solutions:
- Switch the mode from WINTER/HEAT to SUMMER/COOL or vice versa.
- Take the system out of standby mode to fully functioning.
- Switch to the opposite condition of the usage water mode (active to inactive or vice versa).
This can also be a major issue in the system so it is better to contact the company’s customer support for guidance or take help from a licensed HVAC engineer to resolve the issue.
Causes:
- This is not an error but an indication that the system is on the WINTER/HEAT mode and the usage water mode is not active on standby.
Solutions:
- Try the exact solutions suggested for the Airfel air conditioner error code Green LED: ON, Red LED: OFF, Green LED: ON.
Causes:
- This is not an error but an indication that the system is on the SUMMER/COOL mode and the usage water mode is also running on standby.
Solutions:
- Try the exact solutions suggested for the Airfel air conditioner error code Green LED: ON, Red LED: OFF, Green LED: ON.
Causes:
- This is not an error but an indication that the system is on the SUMMER/COOL mode and the usage water mode is inactive on standby.
Solutions: Try the exact solutions suggested for the Airfel air conditioner error code Green LED: ON, Red LED: OFF, Green LED: ON.