How To Clean Fujitsu Mini Split Blower Fan [Step By Step Guide]

Deep cleaning a Fujitsu mini-split means cleaning not only its filters and coils but also its blower fan. If you want to know how to clean your Fujitsu mini split blower fan, we can help you with that.

We have searched the net and put together information on how to clean your Fujitsu mini split blower fan.

To clean the blower fan of your Fujitsu mini split unit, you first need to have access to the item:

  1. Remove the front and top side covers of the unit.
  2. Take out the electrical section.
  3. Separate the coil from the blower fan.
  4. Unclip the bottom cover from its tabs.
  5. Disconnect the blower wheel from the pan.
  6. Clean the wheel with non-acid cleaner. 
  7. Rinse the wheel with warm water and let dry.
  8. Lubricate the fan holder before replacing the wheel.
  9. Reassemble the rest of the parts.

As you go further in this article, you will read more about the specific details on blower wheel cleaning and the steps to maintain good aircon function. If this interests you, then keep scrolling!

Technician cleaning air conditioner indoors, How To Clean Fujitsu Mini Split Blower Fan [Step By Step Guide]

What Steps To Take To Clean Fujitsu Mini Split Blower Fan

Keeping your AC's blower wheel clean impacts its performance and energy efficiency. That is why it is essential to keep the blower wheel clean. The following steps will guide you on how to keep your blower fan clean:

1. Remove the front and top side covers of the unit.

Man worker doing cleaning of air conditioning

Before dismantling any electrical appliance, disconnect it from the power source. Once unplugged, you can proceed with opening the unit.

Disassemble the AC unit by removing the front and top side cover. You can start by unscrewing the front cover lose.

Take the air filters out and remove the screws that hold the inner plastic cover in place -- two on the right and one on the left.

Loosen and remove the top side cover from its clips by gently lifting the inner grill corners that are closest to the wall. 

2. Take out the electrical section.

Worker remove electrical section of the air conditioner

On the top right section of the unit, locate the pipe and room temperature thermistor. Remove these, the three ground screws, and the control box. 

3. Separate the coil from the blower fan.

Separate the coil from the blower fan by removing two screws on the left and right sides of the unit. Then, unscrew the fan motor cover.

You will also need to disconnect the field wires from their terminal block and prevent it from touching any part of the unit. 

4. Unclip the bottom cover from its tabs.

Unclip the bottom cover from its tabs or brackets to access the blower wheel. Disconnect the drain line and dismount the draining pan.

5. Disconnect the blower wheel from the pan.

Male technician cleaning air conditioner indoors service

Separate the blower wheel from its motor. Be sure to clean, drain and dry the pan before reinstalling it. 

6. Clean the wheel with non-acid cleaner. 

Using a non-acid solution, clean the blower wheel. Non-acid solutions are better than acid-based ones because they are environmental, health-friendly, and less corrosive.

It boosts performance by effectively cleaning your AC unit without compromising its parts. 

Click here to see this non-acid cleaning solution on Amazon.

This non-acid universal cleaning solution can clean coils and your AC's blower fan. The generic dilution ratio is 1 part solution to 3 parts water. 

7. Rinse the wheel with warm water and let it dry.

Wash off the cleaning solution from the wheel using warm water. Effectively rinse the solution with slight pressure, using a water hose with a nozzle.

Allow the wheel to dry to help prevent the growth of molds that may cause health problems.  

8. Lubricate the fan holder before replacing the wheel.

Before replacing the wheel, apply silicon grease to the fan holder. This provides lubrication and insulation to protect the fan from corrosion and high temperatures.

Silicon grease also performs well in low temperatures, which makes it the perfect lubricant for AC units.

Check this silicone lubricant on Amazon.

This food-grade grease is great as an electrical insulator and is proven effective within a wide range of temperatures.

9. Reassemble the rest of the parts.

Man worker fixing air conditioning on the wall

Once the wheel is in place, put all the parts back together in the reverse order they were taken apart. Turn the unit on to test how it runs. 

How To Troubleshoot  Common Fujitsu Mini Split Blower Wheel

Keeping your AC and its parts clean greatly benefits your health. Sticking to the recommended cleaning schedule is also good for your health and energy savings. Make sure to include cleaning your blower wheel in your annual schedule.

However, if you notice your unit's fan performing poorly, here are some initial troubleshooting tips:

  1. Check your unit's air filter. A dirty filtration system decreases airflow.
  2. Make sure that your air system's intake grille is not obstructed. Also, check to ensure that the outlet ports are not blocked.
  3. Confirm that your thermostat's room temperature is in the correct setting. 
  4. Inspect the room you are in. Its windows and doors should be closed.
  5. The windows must be draped and insulated if you want the room to cool. It should block off light and warmth from the outside. Installing window and door insulation is a big help.
  6. You also need to account for the number of people and equipment inside a room. Rooms that accommodate a high volume of people and heating-emitting equipment like computers need an HVAC system with high CFM capacity. Otherwise, the AC cannot effectively cool the room.
  7. AC units in "super quiet" mode can also have decreased airflow.

What Are Other Noteworthy Observations In Fujitsu Mini Split

There may be some things that you have come to observe with your Fujitsu mini split. But these observations are not necessarily problems. Here is some helpful information about how your Fujitsu mini split behaves:

Observation  Unit Information
Start-delay After power interruptions, the unit will not start immediately. It has a 3-minute delay mechanism that prevents its fuse from blowing out. In such instances, wait for 3 minutes for the unit to restart.
The unit is making noises. The unit is expected the following sounds: 1. Dripping - expected within a few minutes after the unit is turned on and off. 2. Slight squeaking - happens when the front expands and contracts due to temperature changes. 3. Sizzling - is occasionally heard because of the unit's auto-defrosting. 
Mist or steam from unit *In cool mode, the sudden cooling of air may cause the unit to emit a thin mist because of the condensation of warm air. *In heating mode, the automatic defrosting of the unit may also emit steam.
Weak or no airflow *In heating mode, fan speed decreases to allow parts to warm up. *The fan will stop if the room temperature exceeds the thermostat setting. For the airflow to adjust, input the desired temperature setting in the thermostat. *When heating is on, the fan stops as automatic defrosting occurs. As this happens, the "operation" indicator lamp flashes. In dry operation, the fan activity may be low as the unit monitors the room temperature. *The fan also operates at low speed in "super quiet" and "auto" mode.
No airflow If the unit does not have airflow activity, check if: 1. there is a power outage 2. the fuse has blown out 3. the circuit breaker tripped off 4. the unit is in timer mode.
Incorrect unit response  When the unit is executing differently from the remote command, you may have to re-check the following: * remote control battery life * remote control battery placement

What Are Helpful Operation Tips For Fujitsu Mini Split

To help you understand how your Fujitsu mini split works, here are some information, you don't want to miss:

1. Operation and Performance

Air conditioner on the wall

The Fujitsu mini split makes use of the heat-pump principle. This means that when the temperature outside drops, cold air is let in.

When the unit's heat is insufficient, you may use additional heating devices. This unit may also take a while to heat the entire room.

You also need to know that when the heating mode is on with low outdoor temperature, frost may form in the outdoor unit causing decreased performance.

But not to worry, its auto-defrost function kicks in when frost is detected. The process takes about 7-15 minutes to work.

The auto-defrost even works after the heating mode has stopped. You may also notice that the top part of the unit remains warm after some time. This is not a malfunction. This is due to the refrigerant still circulating the coils.  

2. Auto-restart

As your unit restarts after a power interruption, it will resume its operation immediately before the power failure.

Power interruptions during "timer" mode, the timer will reset, and its indicator lamp will flash upon resumption of power.

Turn the circuit breaker off if any nearby electrical appliances or radio transmitters cause the unit to malfunction. When turning the item back on, resume operation using its remote controller.

You might also be interested in this article: "How To Reset A Fujitsu Air Conditioner."


To sum up, cleaning your blower wheel is just as important as cleaning your air filters and coils. You can ask your contracted HVAC professionals to service your unit or follow this DIY cleaning and troubleshooting guide we compiled for you.

Other related topics:

How To Clean A Mitsubishi Mini Split [ A Step-By-Step Guide]

Types Of Space Heaters For Homes

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