Heil 9000 Limit Switch Problem? - HVAC - DIY Chatroom Home Improvement Forum

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Old 01-02-2010, 12:40 PM   #1
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heil 9000 limit switch problem?

I have a heil 9000 furnace. 20 below zero here last night, house was 52 @ 4am. I tapped on the limit switch and furnace kicked in. However it limited out frequently until reaching 68. Now it seems to be keeping 69-70 but when it shuts down after reaching temp the thermostat blacks completly out for a period of time. Does this mean the limit switch is shutting everything down for a period? When the furnace kicks back on the room temp can again be seen on the thermostat. I have had limit switch problems with this furnace for 15 years. Any suggestions? And can this switch be replaced by do it yourselfer?


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Old 01-02-2010, 05:44 PM   #2
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Sounds like an oversized furnace. And or undersized duct work.

The limit is doing its job. Don't replace it. Fix the problem that is causing it to do its job.

May need to add more return.


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