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Old 09-30-2011, 08:48 AM   #11
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I would guess that your knob is not working or your thermostat is bad.
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Old 09-30-2011, 09:01 AM   #12
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First off - I am curious - I thought the 2008 26BH has ducted air with a thermostat on the wall. Are you saying you have the knobs (fan speed and temp) on the overhead unit?

If you have the temp knob on the unit - can you hear/feel a slight click as you turn it from all the way cold to warm?
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Old 09-30-2011, 12:10 PM   #13
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I guess I'll mention again to check your refrigerant level in the unit. I was very surprised to find out that freezing up is a symptom of low refrigerant.
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Old 10-02-2011, 06:33 AM   #14
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I have ducted air conditioning but the control knobs are in the overhead unit. The wall thermostat is only for the heat. I will check the freon level.
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Old 10-02-2011, 09:02 AM   #15
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The unit also has a freeze sensor, so I am wondering if that is working properly. If you look at my signature, there is a link to a service manual -- under Coleman and then 1976376.pdf. It will walk you through some of the troubleshooting steps. If this does not match your unit, you should be able to google search and find the right one.

These AC units somewhat put you in a bad spot. They are like $600-$700 new plus install if you don't do it yourself. You are going to spend several hundred on having it worked on - so are you better off bitting the bullet and just replacing it or having the old one repaired? The system is sealed, so adding additional freon requires them to add ports - not sure how expensive that is - plus repairing the leak. Tough call.
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Old 10-09-2011, 09:43 PM   #16
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Quote:
Originally Posted by Forgvn77 View Post
I guess I'll mention again to check your refrigerant level in the unit. I was very surprised to find out that freezing up is a symptom of low refrigerant.
A system low on refrigerant will not keep the evaporator temperature above freezing. The condensation and any moisture in the air will freeze when it contacts a coil that is below 32 degrees.
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