Lennox EL296V Furnace Problems & Error Codes — Overview
The Lennox EL296V is a residential gas furnace in the EL296 two-stage series that uses an onboard LED diagnostic system to display fault codes through the lower compartment inspection port. The control board flashes status and error patterns that tell you what circuit or component has failed. These furnaces cannot be twinned per Lennox specs, so each unit runs independently. Common faults on the EL296V track the usual Lennox pressure-proving and ignition problems, with pressure switch and flame-sensing issues leading the call list.
Most Common Problems on This Model
- Pressure switch fault (pressure switch failed to close) The inducer motor is not creating enough draft or the intake/exhaust is blocked, or the pressure switch itself has failed and needs replacement.
- Flame failure or ignition lockout Dirty flame sensor rod or failed hot surface ignitor stops the furnace from proving flame, requiring sensor cleaning or ignitor replacement.
- Rollout switch open fault Flame rollout condition or failed rollout switch opens the safety circuit, and the switch must be replaced only after confirming safe combustion and airflow.
- Limit switch fault Restricted airflow from a dirty filter or failed blower causes the high-limit to trip, or the limit switch itself is bad and opens the circuit.
- Blower motor fault The indoor blower motor has failed or the control signal to the motor is lost, requiring motor or control board repair.
- Both LEDs off (no power) Tripped breaker, blown fuse, or lost line voltage to the furnace shuts down all control power and must be restored at the panel.
- Low voltage or polarity fault Incorrect line-voltage wiring polarity, insufficient supply voltage, or a short circuit in the control wiring triggers the fault and requires voltage and wiring checks.
- Repeated flame loss lockout Intermittent flame sensing from a fouled flame sensor or unstable gas pressure causes repeated shutdowns and lockout until the sensor or gas supply is corrected.
Parts That Commonly Fail
| Part | Notes |
|---|---|
| Pressure switch | Amazon | Fails to close or prove draft when inducer runs, common EL296V fault code trigger. |
| Flame sensor | Amazon | Gets coated with combustion residue and stops proving flame, causes ignition lockout. |
| Hot surface ignitor | Amazon | Cracks or burns out after repeated cycles, stops burner ignition. |
| Inducer motor | Amazon | Bearings wear or motor fails, prevents pressure switch proving and furnace startup. |
When to Call a Pro
Call a licensed HVAC tech for all gas valve work, combustion diagnostics, flame rollout conditions, and control board replacement. If you see repeated pressure switch or flame faults after cleaning the flame sensor and checking the filter, the problem is in the draft system or gas supply and requires professional test equipment and gas-certified repair. Low-voltage or polarity faults also need a tech with a meter to trace wiring and verify safe voltage before the board is replaced.