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Old 02-09-2008, 09:32 PM   #1
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Diagnosing Carrier Problems

Hey. I was hoping someone could walk me thru how to diagnose components on a Carrier / Bryant furnace. Diagnosis using a multimeter. How does one determine which device is truly failing or causing a shut down? How to check Gas Valve, 3 wire Pilot, Ignition/Lockout and after transformer Curcuit board.

The furnaces I deal with are Carrier/Bryant. Model something like 394GAZ0240050AAEA.

In addition, any good picture resources to turn to. Either book, manual or online.


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Old 02-10-2008, 03:39 PM   #2
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Diagnosing Carrier Problems

Try to search the internet for "sequence of operation", furnace etc. A lot of the time the documentation for your unit will state the sequence of operation you may check the manufactures web site for this information.

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Old 02-10-2008, 05:53 PM   #3
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Diagnosing Carrier Problems

Contact a Carrier parts Dealer and get their service manuals if you deal with a fair amount of their equipment.
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Old 02-15-2008, 12:18 AM   #4
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Diagnosing Carrier Problems

Thanks guys. I appreciate the response. I will be trying both things. Contacting a dealer will probably be really productive. Does anyone else have more insight?

I also have the problem of furnace shut down at night. Don't know why for sure. They work for several days fine then one night shut down.
Pilot? Gas Valve?? Ignition/Lockout??? Circuit board????

Which is the most likely to cause this? And I'm actually least suspicious about the pilot.
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