Question about Fujitsu 12C1 Air Conditioner

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I have a Fujitsu Mini Split when the thermostat cycles it trips

The circuit that controls the unit what could be the problem?

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Condenser unit cuts out less than 5 minutes,inside unit is still running but room is warm

Posted on Oct 22, 2010

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Posted on Jul 08, 2010

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1 Answer

My Soleus KFCHP mini-split air conditioner won't cool. Displays error F1: "the communication faults between the indoor and outdoor units." Tried tightening the connections indoors and out. Advice?


Cheryl, the first thing to do with this and any communication error is to cycle power on the unit. You could just be experiencing a blip in the control circuit that many times resets itself with a cycling of incoming power.

Oct 02, 2015 | Soleus Heating & Cooling

1 Answer

The red is blinking 8 times and green 4 times. The error charts states PFC circuit error. How can this be fixed ?


Power off at the isolator for 10 mins then switch back on and try again. If error code persists, then it is most likely the controller in the outdoor unit.
Excessive voltage of DC voltage on PFC circuit in inverter PCB is detected, or the excessive current in the circuit is detected.
> Permanent stop.
[Diagnosis Point]
Controller PCB defective (Refer to after mentioned "PFC circuit diagnosis")

Mar 21, 2015 | Fujitsu 15RLQ Halcyon Wall Mounted Mini...

1 Answer

HOW DO I FIX FUJITSU AOU24CL1 SERIAL SIGNAL (REVERSE) ERROR, AT OPERATION STARTUP


Outdoor controller circuit board sounds faulty. This error means that the indoor and outdoor units cannot communicate. Replace the outdoor controller in this case. Check if there are more than one outdoor PCB as others can be damaged as well.

Jul 25, 2014 | Fujitsu HALCYON AOU24CL1 Mini Split...

1 Answer

How to use thermostat for heat on Fujitsu IAQ halcyon



This unit comes with a remote control (optional wall mounted wired thermostat available) as a standard feature. This unit is precharged with the environment friendly R-410a refrigerant. No additional refrigerant is needed if the line set is 49 feet in lenght or shorter. In addition to its very high 20 SEER efficiency rating, the 15RLQ is only 31 in. long which makes it the smallest Mini-Split System in its category through out the industry.
This category of equipment is ideal for smaller spaces where spot cooling is required. Several models in this category are ENERGY STAR Certified, meaning they save you money on your utility bill. Residential applications including sunrooms and additions are made easier with these air conditioners and heat pumps. Do you have a warm spot in your home? Fujitsu mini-splits can provide extra cooling capacity for those hard to cool areas. Commercially, their small size makes them ideal for small offices, providing individual temperature control.
Fujitsu's I.A.Q. Systems provide residential and commercial property owners an innovative solution for clean, temperature-controlled indoor air. The Halcyon IAQ systems deliver powerful heating and cooling, are designed for ease of use and maintenance, and feature an unobtrusive design which can be integrated easily into any decor. The Halcyon IAQ systems filter dust, pollen and odor making them the perfect addition to any home!
Standard Features system15_18rlq_medium.jpg
  • Wireless Remote Control
  • Plasma Filter
  • Sleep Timer
  • 24 Hour Timer
  • Dry Mode
  • Auto Louver: Up/Down
  • Auto Mode
  • Quiet Mode
  • Auto Restart/Rest
  • Auto Changeover
  • Low Ambient
  • Cold Prevention
Warranty All Fujitsu ductless mini-split air conditioners and heat pumps come with a 2 year parts and 6 year compressor warranty.
Important: All installations must be performed or supervised by a certified HVAC technician in order for the warranty to be valid.

Dec 08, 2009 | Heating & Cooling

1 Answer

Not working


If the circuit breaker tripped,then the unit is trying to work and the remote is certainly telling the unit operate, otherwise it could never trip the breaker if it did not receive a signal from the remote. Your problem may be with the outside unit that te compressor is stalled (having a hard time starting ) and this will cause the breaker to trip. You need a porfessional to diagnose if it is the starter control, or relay, or capacitor, or bad compressor, or bad terminals.

Nov 28, 2009 | Coffee Makers & Espresso Machines

1 Answer

Fujitsu mini split outdoor unit not running, but indoor unit is running after turnning on


Check the disconnect switch and make sure that both the fuses are good and not shot. If one is shot then the system wont work. There are two fuse. Also be careful due to you will be working around 210 volts

Jun 01, 2009 | Fujitsu Heating & Cooling

1 Answer

Outdoor fan is running continuously without using Wireless Remote Controller


Bad control board on the condensing unit up top. The board needs to be replaced as it is sending the message that the system is calling for cooling/heating all the time and doesnt know what to do. If you continue to let it run this way you will ed up having more major issues

Jun 01, 2009 | Fujitsu Heating & Cooling

1 Answer

Fujitsu asu18c1 mini split ah


change the fuse donot operate the unit and change the thyristor

Feb 23, 2009 | Fujitsu 18C1 Air Conditioner

1 Answer

Split system Celestial turn off for a while when runnig and then turns back on again head unit continues to run power light has been flashing when this happens.


Turn off while running and then turn back on again, causes electrical control circuit system was malfunctioning due to overload relay trip off and then this will trigger on when the load was cold setting the unit run again.Overload tripping off due to there's a high current flowing in the circuit w/c is higher than the rated current specified in the unit.Several factors may be consider the head unit is developing hi pressure that causes electrical circuit malfunction.or the thermostat is defective or some thermostatic valve is mulfunctioning.

Feb 19, 2009 | Heating & Cooling

2 Answers

Aou18c1 not shutting off


Fujitsu, Mitsubishi, Sanyo mini-split indoor fan motors operate continuoulsy. The room-temperature sensor is inside the unit, so the fan motor needs to circulate air continuouly to sense room-air temperature. This is normal operation.

Sep 12, 2008 | Fujitsu 18C1 Air Conditioner

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