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Limit Circuits are usually high limit thermostats. If it is resettable, push the button, if not resettable, replace the high limit stat. You will need a wiring diagram and possibly a parts blow up to locate the stat as well as a multimeter to see if the high limit stat is open. The W wire is the one that enables the furnace from the stat. It should be just a relay with no load on it... basically a contact switch. Perhaps that wire doesn't have enough voltage running to the furnace so it detects a "load" on it.
I'd start with the hi limit stats though. |
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