20 Most Recent Fujitsu "AOU18RLXFZ 18,000 BTU Halcyon HFI Outdoor Unit" Questions & Answers


I’m seeing 5 red 5 green flash is compressor failure. Not sure if this is your unit or not. Cycle power to outdoor unit 30seconds and resume. Start with a fan only operation no heat/cool. Let unit run, if no issue then begin and heat/cool cycle. If problem occurs then likely narrows issues to outside. Hope this helps!!

Fujitsu Heating... • Answered on Apr 07, 2021


the light flashing indicates there is a problem. you can try reseting the system by turning the power supply off and back on again 30 sec later, if the same thing happens you need to count the number of light flashers and that relates to a fault code

Fujitsu Heating... • Answered on Jan 12, 2020


From the owners manual: TEMP Buttons: Sets the desired temperature. In COOL or DRY mode, the temperature needs to be set lower than the current room temperature. In HEAT mode, the temperature needs to be set higher than the current room temperature. Otherwise, corresponding operation mode may not start. Temperature setting range AUTO/COOL/DRY 18-30 °C HEAT 16-30 °C

Fujitsu Heating... • Answered on Oct 22, 2019


Lift the front cover as if you were going to clean the filters then look for a small button near the terminal cover on the right hand side. That is the manual on/off button.

Fujitsu Heating... • Answered on Oct 22, 2019


Press the 'Mode' button on the remote until the display shows COOL

Fujitsu Heating... • Answered on Oct 22, 2019


Most likely a faulty thermistor. The error code doesn't show that sequence in the table but in my experience, when the thermistor is way out of normal range (instead of open or short circuit), it will cause the air con to act like this. The trick is to find which one and for that you will need a multimeter to compare the resistance of each against the temp characteristics for that thermistor. The part is cheap but you may have to pay for a tech.

Fujitsu Heating... • Answered on Oct 22, 2019


Some evaporator blower units are electricaly interlocked with condensation pump. Besides the power to the pump, there would be two other wires, these two wires when open locks out the cooling, splice them together to bypass the interlock. In most cases though.

Fujitsu Heating... • Answered on Aug 16, 2019


Tell us what model you are working on. The 9k and 12k units often just run on a single 115 volt power line while the larger 15k and up capacity units run on 220 volts. For the indoor unit to turn on means it is still getting some power. My guess is you have only turned off one of the two breakers that feed the outdoor unit 220 volts. You really have not completely turned off the power. Your breaker should have a connected double throw breaker. If you do have a double connected breaker and they both are "off" I would suspect you have a failed breaker that is still feeding power to the outdoor unit. If you don't know, the indoor unit gets its power from the outdoor unit.

Fujitsu Heating... • Answered on Aug 10, 2019


To learn more about your unit first see whether the unit is receiving power. Check to see your breaker is turned on and that there is power coming out of the breaker (use a volt/ohm meter and measure for 115 volts or 220 volts depending on the units requirements.) Fujitsu has code lights that light up to tell you the status of the unit and gives error codes. I assume the unit is dead and there status lights are not lit up. Next check for power at the outdoor unit with the volt/ohm meter. The outdoor unit will hav a disconnect box on the wall. Some have fuses which may be blown, some have breakers, and some have no fuses or breakers but do have a shorting bar with a handle that you pull straight out to disconnect power going to the outdoor unit. Once you have opened the cover of the unit you can tell which kind of disconnect you have. Remove the cover or pull the disconnect bar. You then will have the power circuits exposed and can measure to see if the unit is getting power. Next, in the case of mini splits, there is sometime a indoor power switch to disconnect power to the indoor unit. The power for it comes from the outdoor unit. Make sure it is turned on. Sometimes kids play around and throw switches and don't know what they are doing and kill the power to the indoor part of your unit. If you are unsure if the indoor unit is getting power, you can remove the indoor cover by prying off the cover, then unscrew the phillips screw on the right of the panel to expose the incoming power terminals and measure for power actually being at the unit. Lastly if you have power to the outdoor unit but no power to the indoor unit and there is no problem with the indoor disconnect, go back to the outdoor unit and check the fuses to see if any are blown. They are located inside the outdoor unit. You will have to remove the outdoor cover and screens to get to them. At this point you should have a repair manual with information on where the fuses are. You may be getting over your head at this point and will best need to get a repair person with experience. Most people are not capable of doing his last step.

Fujitsu Heating... • Answered on Aug 10, 2019

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