It was on the gen when it failed so low voltage isnt an issue. It started & was running fine when we went to bed. Quit at some point during the night. Blower comes on & runs for 30 seconds or so before shutting down. Blower has plenty of speed & it's on the gen so if it's the sail switch it's not because it's not closing i dont think. No access panel so it has to come out to service. Do you know what ohms that switch should be to see if it's bad? I have my meter with me. Limit switch seems like best case scenario right now so i dont have to pull the unit. When/if i do pull it i'll look at that ignitor to see if it's fouled or something.