A pellet grill has more that can go wrong than a gas grill — an auger, an igniter, a fan, and a controller all have to work together every time you hit start — and most owners hit their first real problem within the first season. Here’s how to read what the grill is actually telling you and fix it, instead of guessing.
Quick Answer
Most pellet grill problems trace back to one of four things: stale or wet pellets, a dead igniter (hot rod), an auger jam, or ash buildup in the fire pot. If your grill throws an error code, check fuel and ignition before assuming the electronics are bad — Traeger and Pit Boss both use codes like Er2 to mean “didn’t reach startup temperature,” which is a symptom of a fuel or ignition problem, not proof the sensor itself failed. Temperature swinging 15-25°F around your set point is normal cycling, per both manufacturers; a swing beyond that, or one that grows mid-cook, usually means the fire pot needs an ash vacuum. According to NFPA data, an uncleaned grill is the single leading cause of home grilling fires — about 20% of them — so most “maintenance” is really fire prevention with better food as a side effect.
Decode the problem first
| Symptom | Most likely cause | Fix |
|---|---|---|
| Won't ignite / no flame | Dead hot rod, wet pellets, or empty auger | Prime the auger, check pellets are dry, replace igniter if still cold after priming |
| Er2 / "failed to reach temp" | Fuel or ignition failure, not the controller | Same as above — check fuel path before replacing electronics |
| Er1 / ErL / "LEr" | RTD temperature probe disconnected or failed | Reseat the RTD connector; replace the probe if it still errors |
| ErH / overheat | Excess grease or a flare-up in the barrel | Shut down immediately, cut power at the outlet, clear grease before restarting |
| Temp swings beyond ~25°F | Ash choking the fire pot | Vacuum the fire pot with a dedicated shop vac |
| Auger runs but no pellets feed | Swollen/jammed pellets from moisture | Empty hopper, clear the auger tube by hand, test with Prime before reloading |
”It won’t ignite” — work the fuel path first
Every troubleshooting flowchart on the internet jumps straight to the igniter, but the igniter is rarely the first thing to check. Confirm the auger is actually delivering pellets to the fire pot before you touch the hot rod: most controllers have a manual Prime or Feed button for exactly this test. If pellets pile up in the pot with no ignition after a normal startup cycle, the hot rod — the metal element that glows red to light the fuel — has likely failed; it’s a wear part on every brand and a straightforward swap, not a reason to replace the grill.
Universal pellet grill igniter / hot rod
- Fits most Traeger, Pit Boss and Camp Chef controllers — confirm your model's connector before ordering.
- A 10-15 minute swap with a screwdriver; no soldering on current-generation controllers.
- If the grill still won't light with a new hot rod, the fault is almost certainly the controller board, not the igniter.
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Reading the error codes
Error codes are more useful once you know they describe symptoms, not diagnoses. Er2 on both Traeger and Pit Boss controllers means the grill failed to climb above its minimum startup temperature — roughly 130-160°F, depending on brand — within the startup window, which is usually about 30 minutes. That’s a downstream effect of a fuel or ignition problem, not evidence the controller itself is broken. Er1, ErL, and Traeger’s LEr code all point to the RTD temperature probe: either a loose connection at the controller or a failed sensor, per Traeger’s own support documentation. ErH on Pit Boss units flags an overheat condition, usually from excess grease or an active flare-up in the barrel — treat it as a stop-the-cook signal, not a nuisance to clear and ignore.
| Code | Brand | Meaning |
|---|---|---|
| Err / Er1 / Er4 | Traeger | RTD probe disconnected or bad connection at the controller |
| Er6 / Er7 | Traeger (non-WiFi models) | Auger motor disconnected — replace the auger motor |
| LEr | Traeger | Temperature dropped below 125°F for 10+ minutes mid-cook |
| Er1 / ErL | Pit Boss | Grill probe/RTD not connecting or reading low |
| Er2 | Pit Boss | Failed to reach ~160°F within the startup window |
| ErH | Pit Boss | Overheat — excess fuel or a grease fire in the chamber |
If a code persists after you’ve checked fuel, connections and ignition, both manufacturers recommend contacting support rather than continuing to troubleshoot electronics yourself — a controller or RTD swap under warranty costs nothing; one you pay for out of pocket after voiding the warranty costs a lot more.
Auger jams: almost always a moisture problem
An auger that spins but delivers no pellets, or won’t turn at all, is very likely jammed by swollen fuel. Traeger’s own troubleshooting documentation is specific about the cause: pellets exposed to humidity absorb moisture, swell, and then harden as they dry out again, and that hardened mass can lock the auger solid inside the tube. It happens fastest to a bag left open in a garage or a hopper left uncovered through a rainstorm — pellets are compressed sawdust held together by the wood’s own lignin, and water breaks that bond permanently.
Sealed pellet storage bin
- An airtight, gasket-sealed bin keeps a full 20 lb bag dry through a humid week or a surprise rainstorm.
- Cheaper than a service call, and cheaper than replacing an auger motor.
- Store it inside or under cover — a sealed bin left in direct rain will still take on water at the lid over time.
To clear an existing jam: unplug the grill, empty the hopper completely, and manually clear the auger tube of swollen pellets — a shop vac with a hose attachment reaches most of it. Do not reload fresh pellets until you’ve confirmed the auger turns freely using the controller’s manual Prime or Feed function, or you’ll jam it again immediately.
Temperature swings: how much is normal
Pellet grills hold temperature by cycling the auger and fan on and off, not by running a constant flame like a gas grill, so some swing is built into the design. Traeger states plainly that a 15-20°F swing above or below your set point is normal; Pit Boss’s own guidance puts the typical range closer to ±25°F. If your grill is holding within those bands, it’s working as designed — resist the urge to chase a perfectly flat line with constant lid checks, which cost you more heat than the swing itself.
A swing that’s larger than that, or one that gets worse as a long cook goes on, is a different story. The most common cause by far is ash accumulation smothering the fire pot — a buildup that also happens to be the same problem that causes hard starts and random shutdowns. Our best pellet grill accessories guide has the full cleaning-cadence table (deep clean every 2-3 cooks per Traeger’s guidance); the short version for troubleshooting purposes is: if temperature control has degraded over the last several cooks, vacuum the fire pot before you touch anything electronic.
Dedicated ash/grill shop vac
- A small wet/dry shop vac reaches the fire pot and drip tray far better than a brush alone.
- Keep it separate from a household vacuum — hot ash and grease residue are hard on standard filters.
- Two minutes of vacuuming before a cook prevents most mid-cook temperature complaints.
Grease fires and overheat codes are not a troubleshooting step — stop the cook
An ErH code, visible flames inside the barrel beyond a normal flare, or grease actively pooling and smoking under the grill mean the cook stops now: shut the grill down at the controller, then cut power at the outlet before you open the lid. This is the one failure mode on this page that isn’t primarily an inconvenience. According to NFPA’s home grill fire data, roughly 20% of grilling fires are caused by a grill that had not been cleaned — the single leading contributing factor, ahead of any hardware failure — which means most of what looks like “maintenance” here is really fire prevention that happens to also fix your ribs.
If a fire does start, do not use water on a grease fire — it can spread burning grease rather than extinguish it. Close the lid and shut off fuel/power if it’s safe to reach the controls; otherwise use a class B or class K extinguisher rated for grease fires, and keep the grill at least 10 feet from siding, deck rails, and anything else that burns, as a standing precaution.
When to call the manufacturer instead of DIY
Traeger and Pit Boss both push RTD probes, controllers and auger motors as user-replaceable parts under warranty, so a persistent Er1/ErL/LEr or Er6/Er7 code that survives basic checks (connections, fuel, ignition) is worth a support call before you buy a part — most current-generation grills carry a multi-year warranty that covers exactly this. Our best Traeger grill and best Pit Boss pellet grill guides note each brand’s warranty length by model if you’re weighing a repair against a newer grill.
FAQ
Why won’t my pellet grill ignite? The most common causes, in order: a dead hot rod, wet or old pellets, or an auger that isn’t feeding fuel. Prime the auger and confirm pellets reach the fire pot before assuming the igniter has failed.
What does the Er2 error code mean? On Traeger and Pit Boss controllers, Er2 means the grill didn’t reach its startup temperature threshold in time — a symptom of a fuel or ignition problem, not proof the electronics are bad.
Is it normal for the temperature to swing? Yes — Traeger cites 15-20°F, Pit Boss closer to ±25°F, as normal cycling. Bigger or growing swings usually mean ash buildup in the fire pot.
What causes an auger jam? Moisture. Pellets swell when they absorb humidity and harden as they dry, and that hardened mass can lock the auger. Store pellets in a sealed, gasket-lined bin.
When is a problem a fire risk, not just an inconvenience? An ErH/overheat code, visible flare-ups, or pooling grease mean stop the cook immediately. NFPA data ties roughly 20% of home grill fires to an uncleaned grill — the leading contributing factor.
Sources: Traeger LEr Error Code, Traeger Err, Er1, Er2, Er4 Error Codes, Traeger Er3, Er5, Er6, Er7 Error Codes, Traeger Auger Continuously Feeding Pellets, Pit Boss FAQ, NFPA Home Grill Fires report.