Quote:
Originally Posted by gassy
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That's a Hot Surface Ignitor, it glows, like the glow plug on a diesel engine. The other kind of ignitor is a spark ignitor that spark like a spark plug.
If you ohm the ignitor it should around 75 ohms, if the ignitor is crack it will read infinite or open circuit.
I keep a spare flame sensor and HSI at home incase the furnance goes out at 2:00am.