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Will need the exact model #
Usually on a sticker on unit, you will have to find it to continue
As far as I know, BRISTOL is the name of the compressor inside AC and not the make of AC itself
Thanks for info, your AC unit is a Carrier central air conditioner 38CKS series, they are a complex unit with many switches and devises that could go defective, and this unit is attached to a indoor blower unit or furnace that also have a series of switches.
Diagnosing the exact problem would require you to be knowledgeable with electronic diagnosing skills and voltmeter knowhow.
Is that your case?