Lennox EL296UHV Error Code E 200: Hard Lockout - Rollout Circuit
What Does Code E 200 Mean?
Error code E200 on the Lennox EL296UHV signals a hard lockout caused by the flame rollout circuit opening. The rollout switch is a safety device that detects excessive heat outside the burner area, which happens when flames escape (roll out of) the combustion chamber instead of being drawn cleanly through the heat exchanger. That condition creates a real risk of fire and carbon monoxide exposure.
Unlike soft lockouts that clear on their own, a hard lockout on the SureLight control will not restore normal operation until the underlying cause is corrected. The furnace deliberately stays down so the problem cannot repeat unattended. Common root causes include a blocked or cracked heat exchanger, a blocked flue or vent, or a failing inducer that cannot move combustion products out of the burner area, pushing flames outward.
Because the same conditions that trip a rollout also disturb venting and airflow, E200 often shares a root cause with the venting-related codes on this control, such as E223 and E227, and with airflow and limit faults. A technician looks at the whole combustion and venting path, not just the switch.
This is one of the most serious codes the furnace can show. Even if the rollout switch cools and resets itself, the burners must not be run again until a qualified technician finds and fixes the cause and replaces the rollout switch if it is damaged. A homeowner should never bypass the switch or keep cycling power to force the furnace to run.
What You'll Notice
- The seven-segment display shows E 200 and the furnace will not restart
- No heat, because the furnace is in a hard lockout
- You may notice scorch marks, soot, or a burnt smell near the burner compartment
- The furnace may have made unusual sounds or short-cycled before locking out
- Resetting power does not bring the furnace back into normal operation
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Flame rollout switch tripped due to flame escaping combustion chamber | Most common | ✗ Call a pro → |
How This Is Diagnosed
A technician treats E200 as a combustion-safety investigation, not a switch swap. They inspect the flue and vent piping for blockage or improper slope, check the inducer for correct operation, and examine the heat exchanger for cracks, blockage, or soot that would force flames out of the burner area. They also verify combustion air supply and look for signs of overheating around the rollout switch itself.
Only after the root cause is identified and corrected does the technician evaluate the rollout switch. A switch that tripped from a genuine overheat event and no longer closes is replaced. Confirming clean, correct venting and a sound heat exchanger before returning the furnace to service is the essential part of clearing this fault safely.
When to Call a Professional
This code involves components that are not homeowner-serviceable, so have a licensed HVAC technician diagnose and repair it. Keep in mind:
- The display shows E200 — this is a safety-critical hard lockout
- You see soot, scorch marks, or smell burning near the furnace
- The furnace was short-cycling or making unusual noises before it locked out
- You suspect a blocked flue or vent, or a cracked heat exchanger
- Venting codes such as E223 or E227 have also appeared
Frequently Asked Questions
Can I just reset the furnace to clear E200?
No. E200 is a hard lockout tied to flames escaping the combustion chamber. Repeatedly resetting it can allow a genuinely hazardous condition to keep happening. The root cause must be found and corrected first.
Why is this considered so serious?
A rollout condition means heat, and possibly flame, is present where it should not be. That carries a real risk of fire and carbon monoxide, which is why the control refuses to run until a technician clears it.
The rollout switch reset itself — is the furnace safe now?
Not necessarily. The switch resetting only means it cooled down; it says nothing about the blocked vent, cracked heat exchanger, or failing inducer that tripped it. Those must be inspected before the furnace runs again.
✓ Verified against manufacturer service manual — March 2026