Lennox · Furnace / HVAC
E200 Rollout limit switch open
What this code means
Newer Lennox communicating systems report this alphanumeric alert when flame has escaped the burner area — the same safety-critical fault as the older 5-blink code.
Most likely causes
- Blocked flue or exhaust venting
- Cracked heat exchanger
- Dirty or damaged burners
What to try first
Turn the system off and have it inspected before running the furnace again — this is a safety-critical fault.
Safety first: stop using the appliance and shut off its gas or power until it has been inspected — this fault category is associated with fire or gas risk.
FAQ
What does Lennox error code E200 mean?
Rollout limit switch open. Newer Lennox communicating systems report this alphanumeric alert when flame has escaped the burner area — the same safety-critical fault as the older 5-blink code.
Can I fix Lennox code E200 myself?
No — stop using the appliance and shut off its gas or power until it has been inspected. This fault category is associated with fire or gas risk.
What causes Lennox code E200?
The most common causes are: blocked flue or exhaust venting; cracked heat exchanger; dirty or damaged burners.
Other Lennox furnace codes
All Lennox furnace error codes →
Other furnace brands: Trane · Carrier · Goodman · Amana · American Standard · Rheem · Bryant · Generic · Nest
This information may contain errors or not apply to your exact model — always double-check it against your appliance's own manual before acting. If there's any chance of a gas, fire, electrical, carbon monoxide, or other safety hazard, stop and call a licensed professional or the appropriate agency (e.g. your gas utility) instead of relying on this page alone.