Fujitsu Heating & Cooling - Recent Questions, Troubleshooting & Support


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


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 Jul 16, 2019


It is possible to do this, although it is not easy. It requires reprogramming the HMI in the unit. I am in the process of doing this on my AVN6606HD and it would probably apply to other units to convert from japanese to english.

Fujitsu 24C1 Air... | Answered on Jul 02, 2019


Ensuring a good connection, replacing sensor.

Fujitsu Heating... | Answered on Jun 24, 2019


Is there a flashing green light and /or a flashing red clock looking thing on the head? If so Google that code. Best trick I have found on these splits is:
1. Pull the main power disconnect
2. Let it sit for 10 minutes
3. Plug the power disconnect back in for 10 min.
4. After it has sat for 10 minutes with power start unit in the mode you want it to run in.

Good luck.

Fujitsu Heating... | Answered on Jun 06, 2019


Error code e11 is a communications error. The causes listed in the manual for the outdoor unit are:
1) Connection failure.
2) External cause
3) Main PCB failure.
4) Active filter module failure.
5) Transistor PCB (IPM) failure.
6) Filter PCB failure
7) Outdoor unit Fan motor failure

For the indoor unit the listed causes are:
1. Connection failure
2. External cause
3. Controller PCB failure

With any luck you will have a wiring problem(loose/broken wire). Unfortunately it is more likely to be the Main PCB. Good luck!

Fujitsu Heating... | Answered on Jun 02, 2019


I had the same problem. The heater did not work in heating mode. However it was OK in air-conditioning mode. The operation light and the timer light blink twice and then the operation light blinks for 5 times followed by few seconds non blinking, then the cycle repeats again. I have read on the internet that you better unplug the power cord and then plug it again so that the heater re-sets itself. My only problem was that my heater is directly plugged to the power with no visible plug. So I went to the main distribution board and put off the power for about 20 seconds for the whole home. HOORAY!! The heater worked after that.

Fujitsu Heating... | Answered on May 23, 2019


cool air or cold air? possibly a stuck reversing valve, possibly no condenser!

Fujitsu Heating... | Answered on Apr 06, 2019

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