Lennox EL296UHV Error Code E 200: Hard Lockout - Rollout Circuit
What Does Code E 200 Mean?
Error code E200 on the Lennox EL296UHV indicates a hard lockout triggered by the flame rollout circuit being open or having been previously open. The flame rollout switch is a critical safety device that detects when flames escape the combustion chamber — a condition that poses a fire and carbon monoxide hazard.
Unlike soft lockouts that clear automatically, a hard lockout requires the underlying cause to be corrected before the furnace will operate again. The rollout switch trips when it senses excessive heat outside the combustion chamber, which can be caused by a cracked or blocked heat exchanger, a blocked flue or vent pipe, or a combustion air supply problem that forces flames out of the burner area.
This is one of the most serious error codes the furnace can display. Even if the rollout switch resets on its own, the root cause must be identified and corrected by a qualified HVAC technician before the furnace is put back into service. Operating a furnace with a rollout condition can result in a house fire or carbon monoxide poisoning.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Flame rollout switch tripped due to flame escaping combustion chamber | Most common | ✗ Call a pro → |
When to Call a Professional
Contact a licensed HVAC technician if:
- Immediately — E200 is a safety-critical code that requires professional diagnosis
- You smell burning or see scorch marks near the furnace
- The furnace has been making unusual noises before the lockout occurred
- You suspect a cracked heat exchanger or blocked flue
✓ Verified against manufacturer service manual — March 2026