Ask Experts Questions for FREE Help !
Ask
    jennib02's Avatar
    jennib02 Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Jun 18, 2015, 08:42 PM
    Furnace blower
    Why does my intertherm heater blower come on in the summer and run for hours even with heat shut off?
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
    Uber Member
    		  
    #2

    Jun 19, 2015, 09:02 AM
    If the unit is in the attic or even under the house and it gets very hot, the on signal for the air handler tells the fan to come on. I assume by "Heat shut OFF" you mean at the thermostat, not at the breaker box. You don't have AC?
    drtom4444's Avatar
    drtom4444 Posts: 3,282, Reputation: 145
    Ultra Member
    		  
    #3

    Jun 20, 2015, 10:51 AM
    The fan switch is set way too low and when the unit gets hot it will come on. You can set the "on" or cut-in temperature and the cut-out temperature. You will see it when you remove the front cover where you will see the switch attached to the heat exchanger. Remove the cover to the switch and you will see a dial with three sliders, two can be set, but the high-limit is set at the factory.
    jennib02's Avatar
    jennib02 Posts: 2, Reputation: 1
    New Member
    		  
    #4

    Jun 21, 2015, 04:19 PM
    This unit is in the hallway- it is a heater only unit- the ac unit is in different part of house but I don't run it when I'm not there- is there a way to turn this off? It runs for 8+hours

    Quote Originally Posted by drtom4444 View Post
    The fan switch is set way too low and when the unit gets hot it will come on. You can set the "on" or cut-in temperature and the cut-out temperature. You will see it when you remove the front cover where you will see the switch attached to the heat exchanger. Remove the cover to the switch and you will see a dial with three sliders, two can be set, but the high-limit is set at the factory.
    Can you translate this into "woman talk"? Lol
    bitters's Avatar
    bitters Posts: 348, Reputation: 12
    Full Member
    		  
    #5

    Jun 21, 2015, 04:37 PM
    Quote Originally Posted by jennib02 View Post
    This unit is in the hallway- it is a heater only unit- the ac unit is in different part of house but I don't run it when I'm not there- is there a way to turn this off? It runs for 8+hours



    Can you translate this into "woman talk"? Lol
    Look on the side of the furnace to see if it has a on off switch. Or you could turn the breaker off.
    drtom4444's Avatar
    drtom4444 Posts: 3,282, Reputation: 145
    Ultra Member
    		  
    #6

    Jun 21, 2015, 07:43 PM
    There is a front cover on the furnace that you just lift and pull out to remove. Some heaters have an adjustable fan/limit switch and others do not. Most likely, the best way to stop this is to either unplug the furnace or turn off the breaker to it. More than likely you will need to replace the fan switch and if you have never done anything like that then it would be best to get someone who knows how, even though it's no more complicated than changing a light bulb to most. It just takes removing two screws and changing out two wires that plug onto it. Here is what it looks like: Attachment 47521
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!

Carrier furnace: limit switch fault furnace has ignition but blower will not come on? [ 2 Answers ]

Board says it is a limit switch fault Furace goes into pre ignition, fan comes on and sometimes even the main burner ignites, but the blower will not come on... is this the blower motor or could this be a switch somewhere?

Bryant furnace showing code 12-blower on after power up. Furnace won't start. Why? [ 0 Answers ]

Blower motor on all the time. No heat from furnace. Why?

Tran furnace / air main blower on furnace will not run. But the a/c unit runs [ 0 Answers ]

Main blower on furnace, is not running, when thermostat calls for cooling the out side unit runs. The main blower on the furnace in not

I have a trane eletric ignition heater and blower furnace is heating up but no blower [ 1 Answers ]

My thermostat is a white /rodgers module this clicks to start but no air blowing from the furnace in the attic which is a trane model and the same with cold air the thermostat clicks the ducane model outside whirs but no cols air.

Furnace Blower Motor Runs Constantly & Furnace or AC Won't Run [ 2 Answers ]

I have an Armstrong forced air (induced draft) natural gas furnace with central AC (made around 1990 -- Model: EG6H80DC14-1, Serial: A18315MNA). I had a problem at the end of the heating season where the blower motor would run continuously (even when the thermostat is turned to "off"). I thought...

View more questions Search