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Old 03-26-2011, 09:38 PM   #1
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I have a luxair furnace that will not heat up . It has 4 flashes . It say it has a high limit switch stuck open . How can i get heat tonight

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Old 03-26-2011, 09:42 PM   #2
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The problem that caused the high limit to trip needs to be addressed first for safety reasons.


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Old 03-26-2011, 09:56 PM   #3
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a lot of times when the high limit switch gos off its because of a lack of air flow or a lack of maintenance issues.You could have a cooling coil that has a layer of junk that wont let the fan do its job so theres not enough airflow going on.Heres another possibility that the fan isnt set on the proper speed.Heres a few options for ya.Check the coil thats probably where your problem is.
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Old 03-26-2011, 10:03 PM   #4
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You beat me to it, 1mastertech. I was just going to say...

Probably not what you were wanting to hear, huh OP? The air in the furnace is more than likely restricted, not moving out fast enough, so the furnace itself is getting too hot which is why high limits trip. High temperature limit switch is what they are called so if you do anything to just "get heat tonight" without addressing the "why" the high limit tripped it would be very dangerous as you literally are playing with fire. The evaporator coil, as 1mastertech already has stated, is more than likely dirty and blocking the hot air from properly moving out of the furnace, restricting it's flow. The return air filters could also be attributing to the lack of air flow if they are dirty.

Call an hvac service company out for this one, wear long sleeves and use a few extra blankets for tonight.

Last edited by Doc Holliday; 03-26-2011 at 10:07 PM.
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Old 03-26-2011, 10:12 PM   #5
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check your filter first. then check into the main limit. ensure your blower comes on with a call for heat. if not try the blower with the fan switch on the thermostat to see if that works. if it does work with the thermostat but not a call for heat then you may have stuck relay keeping the blower from running in heating mode. Heating and cooling use different blower speeds and often different relays.

First thing is to check the filter
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