Whirlpool Gas Dryer Won't Heat — 3 Causes & How to Fix

You toss a load of wet towels in your Whirlpool gas dryer, set the timer for 60 minutes, and come back to find them just as damp as when you started. The drum's spinning fine, you can hear the motor humming, but there's zero heat coming from that thing. If you've got a model like the LGR7646EQ3 or LGR5644JQ0, this is almost always about the gas valve coil system failing to do its job.

Before you drop $200 on a service call, let's walk through what's actually happening inside that dryer cabinet. Gas dryers need three things working together: ignition, gas flow, and airflow. When your dryer won't heat, it's usually the gas valve coils (part #279834) that have given up after years of cycling on and off thousands of times.

Quick Symptom Check

Does your dryer match any of these behaviors?

• No heat at all — drum spins, no warmth whatsoever
• Heat comes and goes — works for 10 minutes, then quits
• Igniter glows orange — but you never hear the gas ignite with that familiar whoosh
• Takes 2-3 cycles to dry a normal load
• Clothes come out warm but damp — not hot like they should be

If you're seeing that third symptom—the glowing igniter that never lights the gas—you're looking right at a gas valve coil failure. That's the smoking gun.

Cause #1: Failed Gas Valve Coils (85% Probability)

The coils can become defective over time, causing the gas valve to not open properly. These electromagnetic coils are what pull open the gas valve when your dryer calls for heat. After 8-10 years, the copper windings inside break down, and they lose the magnetic strength to open that valve all the way.

How to diagnose:

1. Unplug the dryer and shut off the gas supply valve
2. Pull the dryer away from the wall—you'll need access to the back panel
3. Remove the lower front panel (two screws at the bottom)
4. Look for the burner assembly—it's that metal tube running horizontally near the bottom
5. The gas valve coils are mounted right on the gas valve body
6. Set your multimeter to ohms and test each coil—you should see around 1000-1500 ohms
7. If you get infinite resistance or zero, that coil's toast

Here's what separates this from other causes: if the igniter's glowing bright orange for 30-60 seconds but you don't hear gas flowing, the coils aren't opening the valve. You might see the igniter glow, then shut off, then glow again in a cycle. That's the control board trying over and over to light the gas that never comes.

The fix: Replace both coils as a kit (part 279834 for Whirlpool, Maytag, Kenmore, and KitchenAid models). You can't replace just one—they work as a pair. Cost is around $25 for the kit, and it's about a 45-minute job if you're comfortable with basic tools.

Cause #2: Weak or Broken Igniter (10% Probability)

Sometimes it's not the coils—it's the igniter that's lost its ability to draw enough current. Gas dryers use a glow-bar igniter that needs to pull around 3.2-3.6 amps to heat up enough for the gas valve to open. Over time, the silicon carbide material degrades.

How to diagnose:

• Watch the igniter through the lower access panel
• If it glows dim yellow or orange (instead of bright white), it's weak
• Use an amp meter in series—less than 3.0 amps means replace it
• Physically cracked or broken igniters are obvious failures

The difference between this and coil failure: a weak igniter will glow dimly and never get hot enough to signal the coils to open. A failed coil will let the igniter get blazing hot but won't open the valve. If you're not seeing that bright glow, test the igniter first.

The fix: Igniters run $20-40 depending on your model. They're actually easier to replace than coils—usually just two screws and a wire connector.

Cause #3: Blocked Vent System Creating Safety Shutoff (5% Probability)

This one's sneaky. If your dryer vent is packed with lint, the high-limit thermostat will shut off the burner to prevent overheating. You'll get heat for a few minutes, then nothing, then heat again when things cool down. The pattern is intermittent heat that cycles on and off.

How to diagnose:

• Disconnect the vent hose from the back of the dryer
• Run a heat cycle—does it stay hot the whole time?
• Check the outdoor vent hood—is air flowing strongly?
• Pull the vent hose off and look inside with a flashlight

Models like the LGR8648LW0 have particularly long vent runs in some houses, making this more common. If you've got more than 25 feet of venting with multiple elbows, you're asking for trouble.

The fix: Clean the entire vent system. Use a vent brush kit or call a vent cleaning service. This isn't a parts problem—it's a maintenance issue that mimics a parts failure.

When to Call a Pro

Look, I'll be straight with you: gas appliances require respect. If you're not comfortable working around a gas line, call someone. The actual coil replacement is straightforward—no gas line disconnection required—but you need to shut off the gas supply and know what you're doing.

Call a tech if:

• You smell gas at any point (leave the house, call the gas company)
• You've replaced the coils and igniter but still have no heat
• The gas valve itself is leaking or damaged
• You're not comfortable using a multimeter for testing

Most appliance repair shops charge $150-250 for this repair including the part. If you're handy, the DIY cost is just the $25 coil kit.

Frequently Asked Questions

Can I replace just one coil instead of both?

No, and here's why: gas valve coil kits like the 279834 include two coils that work in sequence. One coil opens the valve initially (high current), and the second coil holds it open (lower current). They're designed as a matched pair. If one's failed, the other's not far behind anyway. Replace them both or you'll be doing this job twice.

Why does my igniter glow but I don't hear the gas ignite?

That's the classic symptom of failed gas valve coils. The igniter gets hot enough to signal that it's ready, but the coils don't have enough electromagnetic strength left to pull open the gas valve. The control board sees the igniter's ready, sends voltage to the coils, but the valve stays shut. You'll see the igniter glow for about a minute, then shut off, then repeat the cycle. That's your dryer trying and failing to light the burner.

How long do gas valve coils typically last?

On Whirlpool, Maytag, and Kenmore gas dryers, you're looking at 8-15 years depending on usage. If you're running 2-3 loads a day, you'll be closer to the 8-year mark. Light users might get 15 years. The coils cycle on and off with every heat cycle, and eventually the copper windings fatigue. It's not a matter of if they'll fail—it's when. Most LGR series Whirlpool models start seeing coil failures around the 10-year mark.