You walked out to your deck to spritz a 10-lb pork butt, expecting clean blue smoke and sizzling bark. Instead, the grill is stone cold, the fan is screaming, and the digital display is flashing three letters: LEr.
Before you do anything: Take your hand off the power switch.
Do not just turn the dial to “High” or flick it off and on to restart it. Doing that without looking inside the firepot is the #1 way people end up with a massive backdraft explosion that blows smoke out the hopper lid and scorches their eyebrows.
Here is what the LEr code actually means, why it happened, and how to safely get your cook back on track in 15 minutes.
What Does the LEr Code Actually Mean?
On non-WiFIRE Traeger models (like the classic Pro 22), LEr stands for Low Error Reading.
It’s an automated safety shutoff that triggers when:
The internal grill temperature drops below 125°F for more than 10 consecutive minutes.
When the computer detects that the fire went out (a “flameout”), it stops feeding pellets so it doesn’t pile fuel into a dead firepot.
The Danger: Why You Can’t Just Restart Immediately
When a flameout happens, the auger usually keeps turning for several minutes before the computer realizes the fire is dead.
That means your tiny metal firepot is likely packed to the brim with unburnt wood pellets.
If you turn the grill back on:
- The red-hot electric igniter will bury itself in a mountain of pellets.
- The pellets won’t ignite right away; instead, they will smolder and fill the closed barrel with dense, volatile white smoke.
- When the smoke finally catches fire, it ignites all at once with a loud WHOOSH (a backfire), blowing ash everywhere and potentially damaging your hopper auger.
The Safe 5-Step Fix: How to Clear LEr and Relight
Step 1: Power Off and Unplug
Flip the power switch to OFF and pull the plug from the wall. Pull your meat off the grill and place it in an indoor oven set to 225°F to keep the cook moving while you fix the smoker.
Step 2: Clear Out the Firepot (Mandatory)
- Lift out the cooking grates, drip tray, and heat baffle.
- Look straight into the bottom round firepot.
- If it’s full of unburnt pellets and gray ash, use a shop vac (make sure the ashes aren’t hot!) or a metal soup ladle to completely scoop it out until you can see bare metal and the round electric hot rod at the bottom.
Step 3: Check the Hopper for “Pellet Tunneling”
Look inside your pellet hopper. Did you run out of pellets? Or more commonly: did the pellets form a hollow dome or “tunnel” over the auger funnel?
- Hardwood pellets create friction against metal walls. Often, the center drains down into the auger while the sides stick, leaving the auger spinning on thin air.
- Use a wooden spoon to break the tunnel and shove pellets down into the auger intake.
Step 4: Wipe the RTD Temperature Sensor
Look at the small metal peg sticking out on the left side of the grill barrel. If it is caked with black greasy soot, it insulates the sensor from reading true temperatures. Gently wipe it clean with a damp rag or steel wool.
Step 5: Follow the Proper Relight Routine
- Plug the grill back in.
- Leave the grill lid WIDE OPEN.
- Turn the dial to SMOKE.
- Stand by the grill. You should hear the induction fan kick on. Within 3 to 5 minutes, you will smell wood smoke and hear a distinct, steady roar like a miniature blowtorch.
- Once the fire is actively burning and white smoke clears, close the lid and dial your temperature back to 225°F or 250°F.
- Put your meat back in and finish the smoke.
How to Prevent LEr Codes from Ruining Future Cooks
- Vacuum the Firepot Every 2 Cooks: Ash build-up smothers the igniter rod and starves the flame of fresh oxygen.
- Never Leave Pellets in the Hopper in Humid Weather: Compressed wood pellets act like sponges. If they absorb rain or morning fog, they swell up like oatmeal and jam the auger tube. Store your fuel in sealed 5-gallon buckets with gamma-seal lids.
- Use a Thermal Blanket in the Winter: If you smoke briskets in sub-40°F cold, single-wall steel loses heat faster than the auger can feed. A magnetic thermal blanket keeps internal chamber heat stable.
If you are tired of dealing with flameouts on older dial controllers, consider upgrading to a modern brushless PID setup like the Traeger Pro 575 or check out our guide to the best portable pellet smokers.