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I have Intertherm model L 519094 (I hope that's right) gas furnace about 20 yrs old. I'm replacing thermocouple every few months. Also, blower will come on and heat house for about 1 minute then shutoff for about 30 seconds, then it will restart and go to set temp. Seems to do this intermittently, but more often as of late. Any help would be greatly appreciated. Thanks!

Look on furnace facing for data sticker or nameplate to get correct furnace model number.

At 20 years old and gas though, need to have an hvac tech look at it.


Thanks,
Robert