What It Means
Compressor motor winding fault (V9+) or internal control fault (V8/earlier) detected.
Bryant Heat Pump
Bryant Heat Pump Error Code 45
Troubleshooting guide for the Bryant Heat Pump system fault 45.
Possible Causes
- Open or shorted compressor motor windings (V9+).
- Damaged compressor wiring harness (V9+).
- Internal control board diagnostic failure (V8 and earlier).
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
Compressor Winding Fault (V9+) / Control Fault (V8 and earlier). Compressor winding fault or general control fault detected.
All Recorded Causes
V9+: Test compressor winding resistance and compare to specifications. Inspect compressor wiring for shorts or open circuits. V8 and earlier: Check control board for internal faults. Replace control board or compressor as indicated.
Verify Before Replacing Parts
- Confirm the exact Bryant model family and heat pumps context before acting on a generic code description.
- Verify current draw, overload status, and control signal before condemning the compressor or drive, given that v9+: Test compressor winding resistance and compare to specifications.
- Look for upstream conditions such as airflow or charge issues that may be pushing the compressor into protection, and check inspect compressor wiring for shorts or open circuits.
- After the correction, run the system long enough to confirm the heat pumps fault does not return under normal load.
Still unsure about this fault?
ACLogics walks you through Bryant Heat Pump diagnostics step-by-step — so you confirm the cause before swapping parts.
