Question about Cfm Daikin R410a Split System Air Conditioner

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Fan Coil Unit is Cycling on and off. But the room is still hot.

Indoor fan coil unit.
Outdoor chiller.
Rooms set point is 72 degrees.
Took a reading of 83.
Fan will not come on.
When it does come on, cold air does blow.
Belts are fine.
Drain pan is not clogged in any way.
Cleaned the condenser.
WHAT IS GOING ON?!

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  • 34 Answers

Check electrical connection at the T'stat and the indoor blower . Sounds like a loose connection.

Posted on Sep 12, 2009

  • John Pappano Sep 12, 2009

    Check electrical connection at the T'stat and the indoor blower . Sounds like a loose connection.

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4 Answers

My thomastate for ac is showing a flashing snowflake and will not make the ac work how to reset it


The snow flake indicates that the mode is set for cooling, not hearing our both heating and cooling.
There should be two temperatures given by the thermostat, one is the actual room temperature and the other is the temperature setting. The room temperature reading only changes with room temperature change. The thermostat setting temperature changes when the up or down button is pressed.
If your room temperature, say it it's 80° and the temperature is set lower than 80° with a snowflake, the fan should run and start blowing cool/cold air. If you system does not do this, then there is a problem. The problem can be the fan housing cover is not making contact due to the cover not installed properly, nothing will run in this case, no fan. It can be there is no power delivered to the indoor fan, or to the outdoor fan, both these fans must run during thermostat calling for cooling.
The thermostat is not something to be reset as you asked but rather, you check that both fans run and that the outdoor fan makes compressor noise.
Come back with your findings or call a service person. One last try is to shut power to both indoor and outdoor parts of the system and then restore power in attempts to reset the unit or power circuit breakers

Oct 01, 2017 | Heating & Cooling

1 Answer

Is the heat pump cooling itself down? It is a combination heat pump/air conditioner wall unit.


If a unit is in heating mode the outdoor unit is in cooling mode (outside always does opposite of indoor) after a while if there is a build up of ice on outdoor coil unit stops and puts hot gas through outdoor coil to clear it. The indoor fan stops to avoid and heat loss in area served buy unit once this has been done and indoor unit coil is hot again fan will start. This is the correct operation of the unit to save against bust could and reduced efficiency

Dec 31, 2015 | Heating & Cooling

1 Answer

Front grill


Check the air filter and if it is dirty, replace..
Turn equipment off and let the ice melt.
After ice melts, place a/c in cooling mode and set the thermostat to 3 degrees below room temp display.

The indoor unit fan should start blowing cold air immediately and then turn off once the room temp drops one degree below the cooling temp setting.
If the indoor unit does cycle off, check the outdoor unit and make sure it turns off at the same time.
If the outdoor unit continues to run and the indoor fan is not running, the indoor unit will ice up.
A defective compressor relay that is stuck in a closed position will cause icing of the indoor unit because it keeps the compressor running when it should turn off with the indoor fan.

Do you have an error code being displayed on the controller?
Is there an led light that is flashing on the indoor unit?

Another possibility causing the indoor unit to ice up is if the freon in the system starts to get low.
Make sure the ice has all melted for this next check.
Pretty easy to check without special tools.
If the air filter is clean and there is no dust/ dirt blocking the fins on the indoor unit, turn a/c back on to cool and check that the indoor unit fan comes on and is blowing air good.
Once everything seems to running good go to the outdoor unit.
There will be two lines with black rubber insulation covering them.
Peel back the insulation three inches on each line and observe the copper lines.
If either line starts to frost up the a/c system is most likely low on refrigerant.


Another cause of indoor unit icing could be that the aluminum fins behind the air filter are clogged with dust or other foreign material.
This would block the air that must be pulled in causing the indoor unit coil to become too cold due to lack of air flow and it will ice up.

Operating the cooling system when the outdoor temperature is below 60 degrees can cause the indoor unit to ice up also.

I'm Robert.
Florida certified a/c contractor. 30 years experience.
Hope this helps.


Mar 18, 2014 | Fujitsu Heating & Cooling

2 Answers

The outdoor unit doesnt work for ac panasonic cs c9mkp,i have following the instruction on manual book.


After switching the indoor unit to cool, the indoor fan starts and the light flashes, lower the temperature setting to 16 degree centigrade. When the light stops flashing the outdoor fan and the compressor start, if not check the wiring connection going to the compressor contactor. Check if there is power supplying the holding coil of the contactor. If the contactor works, check the power on both contact points by using a volt meter. If the outdoor fan only works, you need to check line working pressure. If the standing pressure is low, compressor will not start.

Sep 02, 2011 | Panasonic Heating & Cooling

1 Answer

Unit for downstairs is running fine, but upstairs unit doesn't want to kick on, but outside unit is running (fairly hot though). Tried to re-set, but "cool" just sits there and flashes on the...


Are you saying you have two HVAC systems or one? If you have two indoor units, you must have two outdoor units. Which outdoor unit is running. You said it is running hot. Assume the fan in running to cool the condenser. If so it should be about 20 degrees warmer than outdoor air. If not maybe you have a dirty condenser coil. Need more information.

Aug 26, 2011 | Carrier 38CKC036 Air Conditioner

1 Answer

I have a contractor that wants to install a 36000btu outdoor unit(model # mh080fxca4a) and two indoor 18000btu indoor units(model #mh052fnca). What would be the output of the outdoor unit? The contractor...


Yes it rated for a maximum out put of 36,000 btu (3 ton) with the right indoor fan coil units which based on the model numbers should give the 36,000 btu's combined when both fan coil units are on, otherwise 18,000 btu's (1.5 ton)per fan coil.

Aug 23, 2011 | Samsung Heating & Cooling

1 Answer

Our air con runs, on heat, and after a time cuts out, blows cold and makes a sort of hissing noise (but not a real hiss) and then shuts down. It then restarts after a couple of minutes. Is this normal?


Yes.Think of a heat pump as a A/C in reverce in cool indoor coil is cold&outdoor coil is hot.Naw indoor coil is hot &outdoor coil is cold&fan is pulling in cold air from outside.its going to iceup& go into defrost cycle.If your unit has a timed defrost every 30,60,or90min.(witch ever yours is set for)Defrost control board checks a sensor on cond.coil,if it is frozen unit goes into defost.You will here a swishing noise,iis the reversing of refrigerant.you will also notice the outdoor fan is not operating&at termanation of defrost fan will blow out steem.the other metod is on demand defrost.when coil freezes unit defrosts.

Mar 02, 2010 | Heating & Cooling

1 Answer

I have a GE air conditioner with ditigal panel. I


Wash out outside coil from time to time.This is the most over looked part of window units. Take care not to spray water directly into fan motor. If not real humid in house check temp coming out of ac inside and make sure filter and coil are clean. run on high speed and the air should have good force. 20 to 30 degree temp drop of room temp should be about right. Much depend on outside temp and humidity and indoor humidity plus insulation factor of area. How many people are in the area and if you keep unit on day and night .

Jun 28, 2009 | GE AJCQ08ACB Air Conditioner

1 Answer

I have a split air conditioner my out fan keeps


It depends on the effiency of the unit. The fan could be cycling because the condensor coil is not hot enough. When it get hot enough the fan will turn on. If not you have a bad fan motor

Jun 25, 2009 | LG LSC091PMA Split System Air Conditioner

1 Answer

Home Air Condition cooling problem


Hello. If your outdoor coils are dirty it's a good chance the indoor coils are dirty also. Clean the indoor coils and flush out the condensate line.
I know it's tempting to feel the air and try to decide if the unit is working properly but, you need to use a thermometer and while the unit is running check the temperature at the return air vent and then check the temperature at the supply vent closest to the unit. Remember to let the thermometer set for about 5 minutes before reading.
You should be looking for about 15 degrees F cooling between the return and supply.
If your coils are clean make sure the outdoor fan is operating properly. The air coming out of the outdoor fan should feel warm, almost hot. If not you may need to check your pressures. Good luck and let me know what you find.

Feb 03, 2009 | Ruud Central System Air Conditioner

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