Troubleshooting high limit switch problems on furnace


Old 11-27-16, 10:59 AM
Thread Starter
Join Date: Nov 2016
Posts: 22
So possibly three problems:

1. The filter is too restrictive
2. The return ducts have some internal obstruction
3. The return ducts are too small

I tried a fiberglass filter and with that in place, I still tripped the high limit switch.

So now, I have put the filter back into place and removed the blower door and put another filter over the blower door opening. My furnace is in my basement, so it's pulling air from the bottom of the house (should be the coldest air) and the basement registers are closed. So theoretically, the furnace should work fairly efficiently as the general airflow should be coming down from the upper floors to the basement.
Sponsored Links

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Display Modes