What It Means
Incoming line voltage dropped below 187 V for over 4 seconds.
Carrier Air Conditioner
Carrier Air Conditioner Error Code 46
Troubleshooting guide for the Carrier Air Conditioner system fault 46.
Possible Causes
- Utility supply voltage drop or brown-out.
- Undersized line wiring or loose electrical connections.
- Excessive voltage drop under load.
Not sure which one it is — or if it's none of these? Try ACLogics today.
Disclaimer: This information is for general reference. Error codes can vary by model and production year. Always refer to your machine's specific manual and the information printed on the unit itself.
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Full Diagnosis
Brown Out (230 V). Line voltage is less than 187 V for at least 4 seconds; compressor and fan operation are not allowed until voltage exceeds 190 V.
All Recorded Causes
Measure supply voltage at outdoor disconnect under load. Check for undersized wiring or loose connections. Contact utility company if supply voltage is consistently below spec.
Verify Before Replacing Parts
- Confirm the exact Carrier model family and air conditioners context before acting on a generic code description.
- Verify current draw, overload status, and control signal before condemning the compressor or drive, given that measure supply voltage at outdoor disconnect under load.
- Look for upstream conditions such as airflow or charge issues that may be pushing the compressor into protection, and check check for undersized wiring or loose connections.
- After the correction, run the system long enough to confirm the air conditioners fault does not return under normal load.
Still unsure about this fault?
ACLogics walks you through Carrier Air Conditioner diagnostics step-by-step — so you confirm the cause before swapping parts.
