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tim schiess 11-05-2012 02:45 PM

gibson furnace
my indicator light says open limit circuit what should i try

Doc Holliday 11-05-2012 02:49 PM

First and foremost change your filter. High temperature limit switches trip due to excessive heat internal to the furnace, 99.999% of the time due to lack of air flow and of that, 50% due to a clogged filter and the other 50% a dirty evaporator coil.

You're going to need a meter to ohm out each individual switch to find out which one it is. Sometimes they are resettable, other times you'd need to have it replaced.

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