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Ask Tom Goellner Your Own Question
Tom Goellner
Tom Goellner, Home Appliance Technician
Category: Appliance
Satisfied Customers: 1637
Experience:  32 yrs. experience servicing major appliances and HVAC equipment.
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Gibson furnace, limit switch has tripped three times in three

Resolved Question:

Gibson furnace, limit switch has tripped three times in three weeks, runs good for few days then trips again. Replace switch , other suggestions.
Submitted: 7 years ago.
Category: Appliance
Expert:  Tom Goellner replied 7 years ago.
WHich limit switch - the one that mounts on the wall above the burners or down near where the burners attach to the manifold?
Customer: replied 7 years ago.
filter felt damp at 3am in the morning , when i reset it ! Filter replace ???
Expert:  Tom Goellner replied 7 years ago.
Filter felt damp ???? I don't know why the filter is getting wet. Is there a humidifier on the return air that is leaking? Lack of air through the furnace will definitely cause the limit switch to open and can be caused from a dirty filter certainly, or a lot of dirt in the blower wheel. Also if this furnace has cooling then it has a coil above the furnace ( if it's an upflow furnace) and if this coil has an excessive amount of dirt on the INSIDE portion of the coil that will restrict air flow . So you need to check these items.
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