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I have an updraft natural gas furnace in the basement w/ a hot surface ignitor. It is not a high eff. I do have a multi-meter. The real strange thing is that last night it seemed to be working again. I live in Michigan and the temps have been for the last week in the single digits and last night was in the upper teens. Like I said, it is 13 years old and has not had a problem keeping temp in the house.
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