All: I was in this forum some time ago, discussing how to's and what if's regarding the high limit switch on my furnace. Here's a recap of the problem: from time to time, the blower will not stop following a heating cycle. It continues running long after the heating cycle has finished. I understand the function of a high limit switch. But, when you think about it, I wouldn't know if the limit switch was working because I'd think that the furnace was simply cycling on/off as normal. The only time I'll even think about the limit switch is when the blower continues running long after the heat cycle has finished. The limit switch was already replaced, and the problem reappeared about a week after the limit switch was replaced. If the thermostat calls for heat while the blower is continuing to run, it will stop and the heating cycle will start again, and then the heating cycle will complete its run with the blower stopping as it should. Every time I call the service tech (service contract with the local utility), he checks here and there and ultimately tells me he can't figure out what the problem is. The fault indicator on the furnace is telling me that the problem is the limit switch. The unit is relatively new (only 5 years old) and the guts (what I'm able to see) still look clean. I change the filters regularly (once a month). I use pleated filters with a 8 merv rating. Any further input on this issue would be greatly appreciated. Specifically, is the limit switch something that I can order and replace myself? The switch is clearly visible when I open the cabinet, and it appears to be removable with just two screws holding it in place.
[Edited by eapples on 10-24-2005 at 03:55 PM]