How do you deal with a failed ignitor?
Step 1: When testing a silicon carbide hot surface ignitor, disconnect it from the control board and measure the resistance using your multimeter.
Step 2: Be sure your multimeter is set to properly measure a resistance of 10 to 200 ohms.
Step 3: A good hot surface ignitor should have a resistance between 40 and 90 ohms.
Step 4: If the resistance measures 100+ ohms, the ignitor is failing and needs to be replaced. If the ignitor measures 120 ohms or greater, it has virtually failed.