AFS error. the heater is not working.

Nov 17, 2015
78
Oxford CT
I have an older Sta-rate gas heater. It stopped working and showed the "ASF ERROR" code. I jumped the sensor, and it started again, working if both wires were connected. I assume it's time to replace the sensor. Am I right? I checked the resistance on a sensor, and it does not change when blowing into the line. By the way, all the lines are clean and clear.
Thanks
 
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