If the unit hums then trips the breaker, the manual directs you to the Start Capacitor and Potential Relay . Do not replace the compressor until you have tested the relay's pick-up and drop-out voltage as specified in Section 4.2.
The Ultimate Guide to the Carrier X2 2500A: Finding, Understanding, and Using the Service Manual carrier x2 2500a service manual
Why guessing is costing you money, and how the OEM manual keeps your X2 2500A running at peak efficiency. If the unit hums then trips the breaker,
Have a repair story about the X2 2500A? Drop it in the comments below—just don't ask us for the PDF link (copyright law!) This post is for informational purposes. Always follow OSHA lockout/tagout procedures and local electrical codes. When in doubt, hire a licensed technician. Have a repair story about the X2 2500A
Locate your unit’s data tag. Write down the Model Number (X2 2500A-XXX) and Serial Number . Call Carrier commercial support tomorrow morning. Get the PDF. Save it to your phone and your laptop.
If the contactor is pulled in but the pipes aren't cold, the manual says: Check the suction pressure at the service valve. If it is below 22 PSI, the low-pressure switch is open. But wait—the manual notes that on the X2 2500A, this switch is manual reset inside the control box, not automatic.