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Old 04-20-2012, 09:36 PM   #1
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How do I fix 4 red blinking lights and blowing cold air when turned to heat

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Old 04-20-2012, 09:38 PM   #2
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You remove the doors of the furnace to reveal the legend which explains what the four flash code stands for, let us know and then we can tell you.

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Old 04-20-2012, 09:49 PM   #3
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okay, it says open limit device.....? i'm not sure what that means..
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Old 04-20-2012, 09:52 PM   #4
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oh thank you, we pulled the fuse and put it back in and its working now.! Thank you
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Old 04-20-2012, 09:53 PM   #5
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It's fixed now and blowing out warm air. thanks again!
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Old 04-20-2012, 10:01 PM   #6
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we work for tips.

Let us know if this happens again. A high temperature limit switch trips due to the furnace overheating. It's a safety device.

If it trips again it'll be due to an airflow issue such as a clogged/dirty return air filter or possibly even a dirty evaporator coil, maybe both.

Keep the filter in brand new condition if not brand new.

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