Lennox Furnace Code E207: Hot Surface Igniter Fix & Cost

Last updated Sep 22, 2026 · By fixme.vip Editorial

Lennox furnace code E207: what it means

Lennox Code E207 indicates a hot surface igniter (HSI) open circuit — the control board applied power to the igniter but did not measure the expected current flow through it. In plain terms, the board thinks the igniter element is broken, disconnected, or otherwise electrically open.

On a normal call for heat, the SureLight control energizes the hot surface igniter, which glows red-hot and lights the burners. If the board detects an open circuit in that igniter loop, it cannot safely proceed with ignition and posts E207.

Because this is a component/wiring fault rather than a flame-proving or gas-supply issue, the fix is almost always a new igniter or a repaired igniter connection. On most Lennox SureLight boards the control will attempt a limited number of retries, then hold in lockout until power is cycled. Exact retry behavior and how the fault displays (LED flash sequence vs. text readout) varies by board generation — check your unit’s label diagram.

Lennox furnace code E207: common causes, ranked by probability

1. Cracked or burned-out hot surface igniter — the silicon-carbide/nitride element fails open with age and thermal cycling. This is by far the most common cause of E207.
2. Loose or corroded igniter connector — the two-pin plug at the igniter or at the control board has worked loose or corroded, breaking the circuit.
3. Damaged igniter wiring harness — chafed, melted, or broken conductors between the board and the igniter.
4. Failed igniter output on the control board — less common; the board’s igniter circuit no longer sources power correctly.
5. Incorrect or incompatible replacement igniter — a previously installed aftermarket igniter with the wrong resistance range can read as open to the board.

How to fix Lennox furnace code E207: safe checks first

These are the only steps a homeowner should do — everything inside the cabinet is technician work.

• Check the thermostat: confirm it’s set to Heat with the setpoint above room temperature, and replace the batteries if it’s battery-powered.
• Replace a dirty air filter: a heavily clogged filter can cause repeated lockouts on some systems; a clean filter rules that out.
• Reset the breaker or furnace switch once: flip the furnace disconnect switch (or breaker) off, wait 30 seconds, and back on to clear a one-time lockout. Do this only once — do not repeat resets.
• Confirm the front panel is fully seated: the door switch must be closed for the furnace to run; make sure the blower-compartment panel is pushed in flush.
• Check that supply and return vents are open and unobstructed.

If E207 returns after one reset, stop and call a technician. Do not open the burner cabinet or attempt to test or replace the igniter yourself.

How a technician will diagnose it

A qualified tech will typically:

1. Read the fault history on the SureLight board to confirm E207 and see how many attempts it logged.
2. Power down and remove the burner-compartment panel to inspect the igniter and its harness.
3. Measure igniter resistance with a multimeter — an open (infinite) reading confirms a failed element; a reading outside the specified range flags a wrong or degrading igniter.
4. Inspect and reseat the igniter connector, checking for corrosion, heat damage, or backed-out pins.
5. Check the harness continuity from the board to the igniter plug.
6. Verify the board’s igniter output voltage during a call for heat if the igniter and wiring test good.
7. Replace the failed component — usually the igniter — then run a full heat cycle to confirm ignition and clear the code.

You can sanity-check a quote: a straightforward igniter swap should be a short visit. A full board replacement is a bigger job and should only be quoted after the igniter and wiring are ruled out.

Symptom, cause and what to do

Lennox furnace code E207 repair cost

Honest US ranges, parts plus labor:

• One-time reset (no parts): $0 DIY.
• Hot surface igniter replacement: ~$150–$350 installed (igniter part $30–$90, plus a diagnostic/service call).
• Igniter connector or harness repair: ~$120–$300 depending on access and parts.
• SureLight control board replacement (if the board’s igniter output has failed): ~$400–$800 installed.

Prices vary by region, furnace model, and whether the visit is after-hours. Getting a written diagnosis before authorizing a board replacement is worth it, since the igniter is the far more common failure.

Related codes

• Lennox Furnace Code 200: Causes, Fixes & Costs — ignition lockout after failed ignition attempts.
• Lennox Furnace Code E204: Gas Valve Wiring Fix & Cost — gas valve circuit faults.
• Lennox Furnace Code E206: Gas Valve Relay Fix & Cost — gas valve relay problems.
• Lennox Furnace Code E125: Control Board Failure Fix & Cost — broader SureLight board failures.