20 Most Recent Fujitsu 18C1 Air Conditioner - Page 4 Questions & Answers

It's thermistor problem. Replace thermistor and run the unit. Hope it's helpful?

Check your thermostat setting and also heating sensor.

Power off the unit. Lift the front cover. And you can clean your blower wheel with long size tooth brush.

Google it.

I had this problem once. I took the front cover off the wall unit and located the the drainage hose and found a build up of dust which was blocking the outlet.

The outdoor PCB has a series of led's on it which indicate the status of what is operating. If the lights are on and nothings working then you will need a new outdoor pcb which is only availible from fujitsu.

Below is an extract straight from the fujitsu service manual:

Compressor location error
The compressor speed does not synchronze with the control signal. (Including start up failure of the compressor).
> permanent stop.
[Diagnosis Point]
Check if 2-way valve or 3-way valve is left open.
Check the compressor (Winding resistance value, loose lead wire).
Refrigeration cycle defective (Refer to after mentioned "refrigerant cycle diagnosis")

Try tighly gripping both sides fo the slide down section to loosen it then slide it down wards.

The outdoor fan may operate at two speeds. The hotter the discharge air temp at the outdoor unit, the faster the fan runs. I would check the suction line and liquid line to see if they get cool when you call for cooling.It is very hard to tell if the compressor is operating since they are so quiet.

If this is not the case, you very well could have a bad capacitor,

Install new batteries, aim it at the unit and press the power button. You should hear a beep or see a green signal. If not, try to command the fan to come on.

the "Discharge" line sweating on a mimn split is normal all of the flow metering is done in the outside unit . as to it not cooling well are the filters clean? if they are you more than likely have a leak and need to get is serviced

Find the drain hose outside the wall and attach a wet/dry shop vac and vacuum out the line......this clears blockages 95% of the time. :-)

Try cleaning the ir sensors on both the remote and the air conditioner. If cleaning doesn't make a difference, then it is possible the IR sensor could be bad.

Prior to operating an air conditioner below 68 degF, a capacity control (such as a hot gas bypass) should be added to protect the system from imminent compressor failures. Running the system at low temperatures will result is refrigerant floodback to the compressor. Refrigerant floodback will surely damage the compressor in one of two ways.........the compressor valves will be damaged due to pumping liquid rather than gas OR the compressor will lock up due to the liquid refrigerant will wash out all of the oil in the crankcase. Your customer will be well advised to have a capacity controller installed to the system to avoid multiple failures of the compressor and potential loss of the wines they are trying to preserve. :-)

What is the serial number? Different Brands use a different sets of numbers to give the manufacturers dates.
Paul Gibson

It is directly behind & thru the wall to outside next to the refer. piping.Everything goes outside thru a 3" hole. tube should b there.Blow it out.good luck

If the compressor is running then you may need to call a serviceman to check the freon charge.