What It Means
Hard lockout triggered by an open flame rollout switch.
Lennox All Systems
Lennox Error Code E200
Troubleshooting guide for the Lennox system fault E200.
Possible Causes
- Blocked flue.
- Cracked heat exchanger.
- Bad draft.
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
Hard Lockout - Rollout Switch Open. The flame rollout switch has detected flames outside the heat exchanger.
All Recorded Causes
Blocked flue, cracked heat exchanger, bad draft.
Verify Before Replacing Parts
- Confirm the exact Lennox model family and e-codes 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 blocked flue, cracked heat exchanger, bad draft.
- Verify each safety device and prove where the sequence stops under live operation, including whether the next candidate on the list.
- After the correction, run the system long enough to confirm the e-codes fault does not return under normal load.
Not sure which system this Lennox code is on?
ACLogics has guided diagnostics for 16 Lennox fault codes and asks the right questions to narrow it down.
