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Are you saying that the problem is with the Fan and Limit switch and if so how can this be verified? Are there any test(s) that should be run to eliminate other possibilities?
Rick - I need more help than this; I don't understand the response. I know there is a PIRR fan relay; is this the G terminal? If you suspect the fan relay how can it be tested? What I am looking for is a way to verify the bad component so I can isolate and then replace.
Is any one of these your thermostat
OK; i turned the thermostats down so the furnace would not get called for heat and the fan did not run. In other cases when the thermostat was not turned down the fan would run even though the thermostats did not call for heat. So, it appears there is some "excess" heat that the fan is trying to dissipate, or, the fan controller/relay, etc is bad. Any other way to test this?
You asked questions about the thermosats the other day. Are there any troubleshooting steps required for these?
Just replace it but you have to know the length before you order it I believe there on second page of this link