I have an older Lennox furnace. The high limit switch (#60T15,130F) has gone bad. I haven't been able to find on-line this part number with the exact temp limit specs, and Lennox no longer carries this part either. Do I have to use this particular limit switch, or can I replace it with something similar?
I have replaced over temp switches in the past because the one that failed was no longer made. I used a slightly low temp rating as the exact temp was not available. Most over temp switches are manual reset. This is a safety so if there is something wrong you have to reset it by pressing a small button on the switch. Don’t replace with an automatic reset because this can damage the fire box and possibly start a fire.