What It Means
Limit switch or flame rollout switch is currently open.
Bryant Furnace
Bryant Furnace Error Code 33
Troubleshooting guide for the Bryant Furnace system fault 33.
Possible Causes
- Restricted airflow due to a dirty filter or closed registers.
- Open limit switch or flame rollout switch.
- Inoperative or slow blower motor.
- Blockage or restriction in the heat exchanger.
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
Limit Circuit Fault. Indicates a limit or flame rollout is open. If open longer than 3 minutes, code changes to lockout #13.
All Recorded Causes
Check for restricted airflow, dirty filter, or blocked registers. Inspect limit switch and flame rollout switch for continuity. Verify blower motor operation. Check heat exchanger. If fault persists over 3 minutes, lockout 13 will occur.
Verify Before Replacing Parts
- Confirm the exact Bryant model family and furnaces context before acting on a generic code description.
- Walk the entire heating sequence in order instead of jumping straight to the reported code, watching for check for restricted airflow, dirty filter, or blocked registers.
- Verify each safety device and prove where the sequence stops under live operation, including whether inspect limit switch and flame rollout switch for continuity.
- After the correction, run the system long enough to confirm the furnaces fault does not return under normal load.
Still unsure about this fault?
ACLogics walks you through Bryant Furnace diagnostics step-by-step — so you confirm the cause before swapping parts.
