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Old 09-24-2011, 02:14 PM  
helios
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I have a similar problem with a Luxaire unit. I came home one evening and found the blower running even though the stat was off. I had to shut the power off to stop it any suggestions on this one? The blower motor is free and no unusual noise. I also have a fault code (4 led flashes) “single long duration limit opening”.



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Old 09-25-2011, 06:37 PM  
hvactechfw
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Quote:
Originally Posted by helios View Post
I have a similar problem with a Luxaire unit. I came home one evening and found the blower running even though the stat was off. I had to shut the power off to stop it any suggestions on this one? The blower motor is free and no unusual noise. I also have a fault code (4 led flashes) “single long duration limit opening”.

sounds like your main limit is stuck open. If the limit is open it means blocked air flow. Check your filter and make sure all your registers are open. You will need to replace the limit if it is stuck open and not resettable.


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Old 09-26-2011, 07:26 AM  
helios
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Do you know where the switch loction is? Its not a filter and i dont know how it would get blocked and all registers are open. could ths anomaly be the blower relay? Which just so happens to be mounted to a circuit board.

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Old 09-26-2011, 01:36 PM  
hvactechfw
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The limit is located to the left of the drat motor below the burner box. If the blower is not running then it could be the control board, motor, or capacitor.


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Old 09-27-2011, 09:17 AM  
helios
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Sir we do not have a furnice this is a package unit w/heatpump. My suspicious are the same as yours blower motor board or capictor. I would like to isolate which one it is before i spend the money replacing any parts. Do you know how i can do this?

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Old 09-27-2011, 09:50 AM  
hvactechfw
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Reading back thru your posts I see you stated that blower motor runs. If this is the case it is not you motor or capacitor. I need more info on your unit to help you diagnose it. Model number? Sorry about the confusion it helps when you post your own thread instead of posting on anothers thread.

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Old 09-28-2011, 10:06 AM  
helios
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Ah, sorry about that. Okay model number AHP24B2AH21A serial number A0K6978957 and its a luxaire. I'll remeber your abvice in future postes.

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Old 09-28-2011, 05:35 PM  
hvactechfw
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You, sir, have an air handler not a package unit. I am unable to verify a fault code 4 only a 2 or 3. Your air handler is made by York.
http://www.upgnet.com/PdfFileRedirect/160619-uum-d-0111.pdf



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