Home Improvement Questions? Ask a Handyman for Answers
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You don't test a flame sensor to ground. You need a meter that can read in DC micro (not milli) amps. Do you have one?
Ok then you have to test the current output forn the sensor while the burner flame is present. Did you clean the sensor?
No temp? if the sensor is good you should read at least 2 micro amps
If you get a good reading next thing to check is a good ground for the unit. Check voltage between neutral and ground you should read 0 volts. Stray voltage from ground to neutral will foul up the flame current reading