Marvin G Cushing , WI July 12, 2020 Very low heat intermittant. Used repair info on this site to narrow my problem down to the gas valve solenoids or the flame sensor. I checked the resistance of all three pieces and they checked ok. Decided to replace both solenoids in a kit and the flame sensor.anyway..... took less than 20 min. to replace. Works great just like it used to. Thanks for the repair info.! Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes