LG DLGX3571V Ignitor – What It Does and How to Test & Replace It
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Understanding the Problem
What the ignitor is and why it matters: The ignitor (glow bar) in your LG DLGX3571V is the ceramic/heated element that glows hot to ignite the gas when the dryer calls for heat. If it fails the dryer won’t light or will take multiple tries to light, causing no heat or delayed heating. Below are diagnostic steps and how to fix it. 1) Safety first - Turn the dryer OFF at the wall and unplug it. Shut off the household gas supply to the dryer before you work on any gas components. If you smell gas, stop and call a professional. 2) Confirm symptom and gather tools - Symptom: dryer tumbles but doesn’t heat, or ignitor doesn’t glow. Tools: multimeter (ohms), screwdriver set, nut driver, needle-nose pliers, replacement ignitor, flashlight, work gloves and safety glasses. 3) Visual inspection - Remove the front or lower access panel (or back panel depending on your unit) to reach the burner box. Look for broken ceramic, cracked or blackened ignitor, loose wiring, or obvious burn/damage. A physically cracked ignitor must be replaced. 4) Test for continuity - Disconnect the ignitor harness. Set multimeter to ohms (×1k). Measure across the two ignitor terminals. A healthy ignitor will show continuity (typically a low-to-moderate resistance value — often a few tens to a few hundred ohms). If the meter reads OL (open), the ignitor is failed and needs replacement. 5) Confirm other systems if ignitor checks out - If ignitor has continuity but does not glow when running: check the thermal fuse, high-limit thermostat, cycling thermostat, door switch and control board for voltage to the ignitor during a heat cycle. Also check flame sensor (flame rod) and gas valve coils if ignitor glows but gas doesn’t open. 6) Replace the ignitor (step-by-step) - a) Turn off gas and unplug dryer. Wait for components to cool. - b) Access the burner assembly: on many LG models remove the lower front panel or rear panel. Unscrew fasteners and gently set panels aside. - c) Locate the ignitor mounted next to the burner tube inside the burner box. It will be connected with a 2-pin connector and secured with 1–2 screws or studs. - d) Take a clear photo of wiring for reassembly. Disconnect the 2-pin harness by releasing the clip and pulling straight out. - e) Remove mounting screw(s) and carefully lift the ignitor assembly out — the ceramic element is fragile; do not touch the ceramic with bare hands or flex it. - f) Install the new ignitor: position it in the same orientation, secure screws (do not over-tighten), reconnect the harness, and route wires as originally found. - g) Reassemble panels, restore gas supply, plug in dryer. Run a heat cycle to confirm the ignitor glows and gas ignites properly. 7) If new ignitor still won’t light gas - Check for voltage to the ignitor during the heat cycle (use a multimeter while dryer is ON — if you’re not experienced, get a pro). If voltage is present but no ignition, suspect gas valve coils or restricted gas supply. If no voltage, suspect thermostats, timer, or control board. Safety note: Working on gas appliances involves risk. Always shut off gas and power before disassembly. If you are unsure about testing live voltage or dealing with gas valves, hire a licensed technician.
Common Symptoms
Dryer tumbles but won’t heat, ignitor doesn’t glow, repeated clicking with no ignition, gas smell during attempted light, or visible cracked/glazed ignitor.
Common Causes
- Broken or burned-out ignitor (ceramic glow bar) — most common
- Open thermal fuse or high-limit thermostat interrupting the heat circuit
- Failed gas valve coils or flame sensor (ignitor glows but gas doesn't open)
- Wiring/connectors damaged or control board not sending power
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Helpful Repair Tip
Quick confirm: remove the access panel, run a heat cycle and watch the burner area — a working ignitor should glow bright orange before the gas valve opens. If it never glows and shows no continuity on a multimeter, replace it.
Frequently Asked Questions
How do I test the ignitor on my LG dryer?
Unplug the dryer and access the ignitor. Disconnect its two-pin connector and use a multimeter on the ohms setting. A good ignitor will show continuity (a measurable resistance). If the meter reads open (OL) the ignitor is bad and should be replaced. Also inspect for visible cracks or damage.
Can I replace the ignitor myself or do I need a technician?
A handy homeowner with basic tools can usually replace the ignitor: it’s a mechanical swap and simple electrical connector. However, you must shut off the gas and power, avoid damaging the fragile ceramic, and if tests require live-voltage checks or gas-valve work, hire a licensed technician for safety.
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