Ask Experts Questions for FREE Help !
Ask
    cweeni00's Avatar
    cweeni00 Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Jun 18, 2012, 01:30 PM
    Central Air blower not working
    I have a 5 year old Newmac CL 115 Wood/Oil combination furnace with central air connected. When I started the air conditioner this season the blower would not turn on in auto mode. The blower works fine in auto for heat, and I can force it to start with the ON function for A/C. Also, I have two thermaostats, one for Oil, one for Wood. Everything worked fine last season. Any ideas?
    Thanks in advance
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jun 18, 2012, 04:14 PM
    Quote Originally Posted by cweeni00 View Post
    I have a 5 year old Newmac CL 115 Wood/Oil combination furnace with central air connected. When I started the air conditioner this season the blower would not turn on in auto mode. The blower works fine in auto for heat, and I can force it to start with the ON function for A/C. Also, I have two thermaostats, one for Oil, one for Wood. Everything worked fine last season. Any ideas?
    Thanks in advance
    Check/test the A/C fan relay and or the setup that is being used to activate the blower fan in the A/C mode.
    drtom4444's Avatar
    drtom4444 Posts: 3,282, Reputation: 145
    Ultra Member
    		  
    #3

    Jun 18, 2012, 09:57 PM
    The only difference between the two modes is that a fan switch mounted on the heat exchanger activates fan in heating mode and a fan relay does this in cooling mode. Trace the G from T-stat, usually the green wire where it ties at furnace. That wire will lead you to the fan relay. The coil may be bad in that relay. It should be a 24 volt coil that you can test with an ohm meter. If open, replace it for about $5.00.
    cweeni00's Avatar
    cweeni00 Posts: 2, Reputation: 1
    New Member
    		  
    #4

    Jun 19, 2012, 01:24 PM
    How do I check the relay with a multimeter? There is a black and a white wire leading from a copper coil. Do I check across those two wires? Do I check when the fan is off or on?
    drtom4444's Avatar
    drtom4444 Posts: 3,282, Reputation: 145
    Ultra Member
    		  
    #5

    Jun 19, 2012, 03:42 PM
    You got it. Those are the coil wires that go to plug-on terminals.
Not your question? Ask your question View similar questions
 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

Central Air blower not working [ 17 Answers ]

My central air conditioning blower is not working. Fan on outside unit works but inside fan does not. When I manually turn the fan on at the thermostat it still does not work. What do I need to check?

Central air blower working for hot air but not ac? [ 1 Answers ]

Hi, When my blower for my heat/ac is working fine when I have it on heat (from the furnace) but when I switched the thermostat over to cool the cool air came out but wasn't forced i.e. the blower doesn't start up? Any ideas anyone? Thanks a lot.:confused:

Central air blower not working [ 1 Answers ]

My central air turns on, I can hear the motor on, but the tube outside that connects into the house is freezing up and air will not come out. I have to leave it off all day and at night when I turn it on, it comes on. Someone else told me it has a climate control or something? Could it be just...

Central air blower not working [ 0 Answers ]

I have a Carrier Weathermaker 8000. The blower motor runs at a low speed mostly and does not blow cold air with the condensing unit running. I changed out the fan motor control board with a new one and I still have the condition. The motor is not making any kind of noise, but it just runs at a...

Central Air Blower not working. [ 7 Answers ]

The blower on my central air unit is not working. It starts to hum and if I spin the blades (which spin freely) manually it turns on for a few minutes but then shuts off. I turned the thermostat to ON and cool. Not sure the model number all I know is it says Sears All Conditioner on the side of...

View more questions Search