Question about Heating & Cooling
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Posted on Jan 02, 2017
If you have a heat pump do not put your blue wire on b. Put it on x or c. If you don't have an inline fuse you may have blown your transformer.
Posted on Dec 04, 2007
SOURCE: Air handler motor and capacitor
Just take out the fan and capacitor they are not OEM so any fan motor would work as long as same Horsepower and milti speed. And the capacitor is a 5 uf or maybe 7.5. You might have to cut off the shaft of the new fan motor so it don't stick out.. You can get a new fan and capacitor at any Heating and Air parts house. And you are sure they are bad you ohmed them out? Fans are not cheap about 50-75 bucks retail. Let me know how it goes. ken
Posted on Dec 23, 2008
Look at your Thermostat wiring.
If there is a green wire going to the "G" terminal, disconnect it.
If it stops running, you have a bad T-stat.
If it keeps running, you either have a stuck fan relay or a low voltage control wiring malfunction.
Those are usually related to one of the safety switches having problems.
If green is not going to G, let me know, and we will determine which one is indeed the fan wire and go from there.
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Posted on Jan 03, 2009
If you have a standard thermostat the fan switch is for the air handler only. It completely over rides the thermostat for most settings. Now lets see this is what I'd expect:
fan switch on Indoor fan runs all time
Fan switch auto Indoor fan only runs when thermostat is set to cool or heat and the thermostat is turned up above room temp for heat or below room temp for cooling. In both of these modes the furnace blower comes on and stays on til the room temperature is satisfied. The outdoor unit only comes on for AC the out door unit will not come on for heat or the "on" setting on the thermostat. See exception 1 & 2 below...
Exception 1- (in a heat pump the out door unit runs in both heat and cool mode unless it has emergency heat turned on then it will not come on outside in the heat mode, and depending on the type of heat pump and furnace or air handler it is). A heat pump thermostat usually has "backup heat" and an "emergency heat" setting switch on the thermostat.
Exception 2 - On some thermostats they are made to cycle on the heat if the temperature reaches a preset temp (around 50'f usually but definitely by 40'f). This mode prevents freezing when if instance the homeowner is away or while the home is under construction. In this mode the fan inside can run but the heat usually comes on with it.
Exception3 - On some electric furnaces the heating strips may be individually controlled and thus not all come on at one time. This may give the feel of no heat especially if the room is cold.
Now there may be other exceptions but Ive tried to give you a heads up on some of the most common ones.
If you need more help please post more specifics about your unit/system as to for sure what switches are set to what setting and what is happening with each. My first though was that maybe your system is OK and you needed to know if the thermostat was working properly.
If this helpd you understand your problem would you please give me as hifgh a mark as you can. Thnaks for using fixya and good luck.
Posted on Mar 28, 2009
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