What is a good resistance reading for a Glo-Sil igniter? A) 50–250 ohms B) 300–450 ohms C) 550–700 ohms D) 800–950 ohms
A good resistance reading for a Glo-Sil (silicon carbide) hot surface igniter is typically in the 50–250 ohms range, so the correct choice is A. A reading that is very high (hundreds to thousands of ohms) or infinite (open circuit) usually indicates a failed igniter.
What the meter reading is telling you
A Glo-Sil igniter is an electrical heating element. When it is healthy, it should have a moderate cold resistance, meaning it is not open (infinite ohms) and not effectively shorted.
Matching the typical range to the choices
Silicon carbide hot surface igniters commonly measure on the order of tens to a couple hundred ohms when cold. Among the options given, only 50–250 ohms fits that expected range.
How to interpret out-of-range readings
- Open circuit (OL, infinite ohms): the igniter is broken and will not heat.
- Much higher than normal (hundreds to 900+ ohms): often indicates a deteriorated element and unreliable ignition.
- Near 0 ohms: uncommon for these igniters and suggests a short or a measurement issue.
Quick check tip
Measure resistance with power off and at room temperature, then compare to the manufacturer spec if available. If the reading is in range but the igniter still will not light, check supply voltage and the control sequence.
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