Limit switch function


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Old 11-21-21, 08:36 AM
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Limit switch function

I was having a problem with my blower motor not turning on. I changed the combination fan and limit control Honeywell l4064 and it was still acting up. I then jumpered the heater fan control pictured below and its working fine. I think its supposed to close at 110degrees? Its a few feet above the heat exchanger. Isn't the combination fan and limit control supposed to control the fan on/off at 100/130 degrees also?


 
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Old 11-21-21, 10:26 AM
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The combo fan/limit control is typical what control the blower.
The switch in the picture is also a fan switch.
F110-2 stands for fan control - close at 110 and open at 90.
Those switches are not normally wired in thermostat cable.

I'd need a wiring diagram of your furnace to comment further.
 
 

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