WFG505M0BS0 Oven Igniter Glows but Oven Won't Heat – What Part Fixes This?
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Understanding the Problem
If the oven igniter in your Whirlpool WFG505M0BS0 glows but the oven never reaches temperature (or doesn’t light at all), the most common cause is a weak or failing oven igniter. The igniter must draw enough current to open the gas safety valve; when it ages it can still glow visibly but not produce the required amperage, so the gas valve remains closed. Other possible contributors include a faulty oven safety valve, a bad electronic control board that doesn’t send the proper signal to the valve, or a damaged oven temperature sensor causing the control to shut off heat. This guide focuses on the igniter failure scenario because it’s by far the most frequent reason for the symptom you described and is usually the part that fixes the problem.
Common Symptoms
Igniter glows but oven never lights; long ignition time; oven takes very long to preheat or never reaches set temperature; clicking or repeated attempts to light; burners unaffected (stovetop may work if separate).
Common Causes
- Worn/weak oven igniter that cannot draw sufficient current to open the gas safety valve
- Faulty oven safety/gas valve (won’t open even when igniter draws current)
- Defective electronic control board or wiring preventing valve activation
Popular Parts That Fix This Problem
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Helpful Repair Tip
Confirm the igniter is the problem by observing: if the igniter glows but the oven never lights, use a clamp ammeter to measure current to the igniter during start-up — a good igniter typically draws ~3.2–3.6 amps. If it draws noticeably less, replace the igniter.
Frequently Asked Questions
How can I test the igniter to be sure it’s bad?
Visually check: a failing igniter may glow weakly or take long to glow. Best test is a current draw test: with the oven trying to light, use a clamp ammeter on the igniter lead — a healthy igniter typically draws about 3.2–3.6 amps at start-up. If it glows but draws significantly less, it’s weak and should be replaced. Alternatively, measure continuity with a multimeter to confirm the element isn’t open (but continuity alone won’t confirm adequate current draw).
Can I replace the igniter myself and is it expensive?
Yes — replacing a gas oven igniter is a common DIY repair for someone comfortable working around gas appliances and basic wiring. Typical steps: shut off gas and power, remove oven bottom or access panel, disconnect the igniter wiring, unbolt and replace the igniter, then restore power/gas and test. Part cost is usually moderate (often under $100), but if you’re not comfortable working with gas or electrical components, hire a licensed appliance/service technician for safety and proper testing.
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