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My heating/air conditioning unit has been blowing all day. Neither the furnace nor the air cinditioner has been turned on. What is the problem?

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  • Anonymous Jun 10, 2008

    I have

  • Anonymous Aug 12, 2008

    I need how to check the thermostat

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Check fan switch on thermostat

Posted on Jun 10, 2008

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1 Answer

What are twinned units?


Twin units can be two airconditioner condensers and/or two furnaces. Most manufacturers make a twinning kit that will wire two units together to operate simultaneously by one thermostat. At times, one may operate as a first stage of heating (cooling) and then the other unit can operate as second stage. Twinning unit are beneficial in commercial buildings where the load conditions vary constantly. For instance, if you twin two 4 ton units together. On a nice cool day, you may only need 4 tons of air conditioning. So, the thermostat will only turn on one unit. On a hotter day, you may need 8 tons of air, so the thermostat will turn on both units. In case you are thinking about doing this, the biggest mistake in twinning units together is using a common return air for the furnaces. Make sure you separate the return air cavities and ductwork for both of your furnaces If you don't have separate returns, you have the possibility of one of the blowers starting backwards. (talking form experience LOL)

Aug 13, 2011 | Air Conditioners

1 Answer

Unless we set the thermostat very high, like 80 degrees, the heater will blow cold air. When the heat does blow, it will eventually stop blowing heat and the fan will continue to blow cold air.


Check and make sure the filter is clean. This sounds like a restriction in the system. If the unit has central cooling make sure ther indoor evaporator coil is clean at the furance.The unit may be cycling the burners on and off at the high heat limit , fan/limit control. You can also eliminate the thermostst from the furance. Turn power off at the furnace and disconnect the wiring from the thermostat. Jumper the red and white wire together. Turn the furnace back on. The furance should run in the heating mode. Try this and see if the problem is still there.

Jan 25, 2011 | Air Conditioners

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Heating unit blows warm air then turns to cold air


it sounds like unit could be kicking out the low pressure switch or if it is a electric furnace it could be the sequincers

Jan 11, 2010 | Ruud UBHC Air Conditioner

2 Answers

Coleman roof top a/c, is the heat controlled by thermostat


hi
on the new colman units (trane) the heat is control only from the t-stat.
i will reccomand a programble t-stat for the new unit.

thanks

Nov 02, 2009 | Coleman Mach III Air Conditioner

1 Answer

My electric furnace/heat pump runs even when the therm is off.


electric furnaces turn on the heat in stages so you dont get a major surge. the fan and the "first stage of heat" are on the same switch. that switch is stuck closed, so that it always has power going thru it. it needs to be replaced

Aug 27, 2009 | Air Conditioners

1 Answer

In my mobile home I have a coleman furnace model number 7970-856. It was over 100 degrees today and my furnace fan is stuck running and I don't now if it's supposed to do day. There is no fan switch on the...


There is a fan cycle switch that turns on the fan when the unit heats up (so it won't be blowing cold air) and runs the fan after the unit has shut off to remove heat from the unit. Sounds like it bit the dust. It is located next to the firebox.

Jul 29, 2009 | Air Conditioners

1 Answer

Heat temperature issues with Goodman GMP 100-4 furnace


69,000 btuh is adequate for a 12-1400 square foot house.
Otherwise, your thermostat simply tells the furnace to cycle on/off.
If it calls for heat and does not come on, the problem is with switches and relays within the furnace.
Your setting the temp higher only causes the other parts to keep trying until they finally light and heat.
This is based on your information saying it will cycle on and blow cool air--not hot air.
You will have several temperature variations from floor to ceiling.
You probably have ceiling vents as well.
You need a technician to verify the rollout switches, fan relay, inducer fan etc. if the furnace is not firing everytime you call for heat.

Feb 21, 2009 | Goodman CPLE24-1 Air Conditioner

1 Answer

No heat, just cold air blowing


the problem you are having is usualy related to. #1 a high limit condition.(check the filter,then cycle the power off then on). Does the furnace have a diagnostic indicator?

Jan 04, 2009 | American Standard WCZ060F Air Conditioner

1 Answer

Intertherm heating


My heating unit is blowing cool air. The thermostat will start the blower when the unit is turned on at the thermostat, but the air isn't hot. But,when I turn the unit on at the furnace/blower using the "Fan On" button, I can see the heating element heat up. After the blower starts the heating element does out. What could be the problem?

Oct 29, 2008 | Intertherm P3RA-048K Air Conditioner

1 Answer

Central air conditoner unit doesnt blow cool air into home has some ice on the inlet heat and cooling lines going into the central air unit


Change the furnace filter. Make sure you use a cheap one when air conditioning, as the better ones restrict airflow when they filter out so much stuff and then plug up, not allowing enough air to pass over the cooling coil in the furnace's air plenum. Turn the A/C off for a few hours (with only the furnace fan on if possible) to melt the ice off the cooling unit inside the furnace.

Sep 01, 2008 | Carrier Air Conditioners

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