gas furnace
 

i have heil gas furnace tha was cycleing off and on repaced ignitor and flamesensor but it stilldoes the same thing burner comes on for 30seconds and then shuts down

I moved this to heating and air--HVAC---Mike----

Any blinking diagnostic lights? Model/age or photos with doors removed..helps.

Unit overheating?..Dirty filter/ too many outlets closed/ furniture blocking return air opening/ dirty AC coil/

heil had a problem with faulty limit switchs at one time....causing your discription....inner city product... ben sr