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, b...

I have an Intertherm propane furnace in a moblie home, the problem I am having seems to be intermittent, furnace will start and takes about 1 minute before blower comes on, then it runs for about 30 seconds a cuts back out, satys off for about 30 seconds and then runs fine. Blower model number is 91...