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All right people I have a older furnace with a honeywell combonation fan limit sw model # l4064b2954.This unit is 1 year old.I replaced it prior because of no gas flow.Well I woke up this am and it was 12 degrees in the house.I have played with the sw and now things are working,but my question is what should the 3 on off switches be set at.Originally when i replaced the unit i just transfered the old unit settings.I live in central Alberta.The second part of my question.On a mercury sw thermostat two wire, how come you can see a spark from the glass bulb when you wiggle test it(normal current flow) but today i cant get any flash.Does this mean ive got a t-stat problem. Im an automotive tech by trade and I deal with a lot of auto electrical.Im kicking myself for not haveing my dvom at home.