Gibson furnace, limit switch has tripped three times in three weeks, runs good for few days then trips again. Replace switch , other suggestions.
Reset limit switch three times in a three week period. runs good for few days then trips again, replace switch, other suggestions?
WHich limit switch - the one that mounts on the wall above the burners or down near where the burners attach to the manifold?
filter felt damp at 3am in the morning , when i reset it ! Filter replace ???
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.
32 years servicing major appliances and hvac equipment