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Old 11-23-2008, 11:12 AM   #1
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Carrier 8000 TS - code 24 ?


I have a carrier 8000 TS - Installed may 2003
1. furnace won't turn on
2. code 24 ( 2 short and 4 long light flashes)
3. code 24 says : secoundary voltage fuse is open - check for - short circuit in secoundary voltage wiring (24 VAC) wiring
what are my steps to fix this?
Thx
PS: My furnace was working till my hot water tank broke and water was around my furnace . I cleaned it up and used a hair dryer to dry the floor. I thought I was careful to ensure it was not close to the furance. Now the water tank is fixed by furnace won't turn on.

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Old 11-23-2008, 11:56 AM   #2
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Carrier 8000 TS - code 24 ?


The fuse is located on your circuit board(in the front), It is a 3 amp automotive type fuse. If you dont have a 3amp you can use a 5 amp fuse but not any higher. Try replacing the fuse and if it blows again then you know you have a 24v short somewhere.

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Old 11-23-2008, 12:46 PM   #3
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Carrier 8000 TS - code 24 ?


Perfect! I replaced the fuse and the furnace is up and running. Thank you for saving me a service call that I have cancelled for monday!
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Old 05-03-2011, 08:21 AM   #4
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Carrier 8000 TS - code 24 ?


I had the same problem this morning and woke up to a cold house. After reading your posts I checked the circuit board for the fuse and it was not fully plugged into the board. The furnace was up and running five minutes later. Many thanks!
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Old 06-05-2011, 03:48 AM   #5
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Carrier 8000 TS - code 24 ?


Thank you very much! I shorted the unit out when the maintenance man left a wire unplugged and it sparked. I found the 3 amp fuse and replaced, voila! Thanks a million!!
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Old 03-22-2014, 10:46 AM   #6
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Carrier 8000 TS - code 24 ?


First, this is one of the worst furnaces I have ever had in a house. Second, it always blows out the inducer motor, which I found a way to buy wholesales and install myself 4 times in 10 years.

I read on DIY about the flashing code 24. Realized I had a wire that was not completely covered / protected and caused a short when I was putting cover panel back on. I got a new fuse for $2.00, taped wire to protect it and YAHOOOO. Furnace back up and running. If I had to call HVAC guy it would have cost me $200.00, unless the guy gave me some BS and told me entire circuit board needs replacing for $800 or some odd amount.

THANK YOU DIY. I will always go to YOU before I call for help.
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Old 03-22-2014, 11:39 AM   #7
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Carrier 8000 TS - code 24 ?


I have worked on lots of them and they don't blow out that many inducer motors or have a chronic problem with that. Check the voltage to it. If it is less than 110 volts then that may be a problem. I have a few that spin backwards when off because of a negative pressure in the house coming down the chimney but that is a different issue. If yours is doing that then it may be wearing them out.

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