Feed problems: jams, gaps and uneven pellets

When a fire sags or goes out in the middle of a cook, the cause is often in the fuel or the feed path. The grill can only burn what reaches the pot.

How a feed problem shows up

A pellet maker describes the usual picture. The controller is set to 250°F, but the grill drops to 200°F and then climbs to 325°F.¹ That's far more than the normal drift covered on the page about why temperatures swing.

The same maker says that when owners complain about swings or losing the fire mid-cook, the first question it asks is what pellets they use.¹ A pellet seller would ask that, so weigh it accordingly. Still, grill makers say similar things.

Pellets: the first thing to check

One grill maker says low-quality or old pellets can cause temperature fluctuations.² Another says old and low-quality pellets burn less efficiently than fresh, high-quality ones and can cause fluctuations.³

The first maker gives a simple check you can do by eye. Inspect the pellets where the auger delivers them, or in the pot itself. If they crumble or look dull, try a fresh bag.²

The pellet maker adds that very often the problem is far simpler and the solution far easier than a broken part.¹ In its view, people often assume the controller or sensor has failed when the pellets are the cause.

The sources here don't explain how pellets absorb water. They do say old pellets are a problem, so store pellets the way the pellet bag or your manual says.

Why uneven feeding matters

The auger feeds a small amount of pellets into the fire pot.⁴ At lower settings the auger rests for longer stretches.⁴ That has a consequence worth thinking about.

If crumbled pellets or dust feed in unevenly, or a gap develops in the supply, the pot gets less fuel than the controller expects. The fire sags. The controller then feeds more, and the result looks like a big swing or a flameout. The chain of cause here is reasoning, not a quoted finding.

Jams and gaps

A jam means the auger can't carry pellets forward. A gap means no pellets reach the pot for a while, for instance if the hopper runs low. No source I've saved gives a maker's own steps for clearing a jam. Clearing one involves moving parts and power, so don't improvise.

Follow your manual. It will say how to unplug the grill, let it cool, and clear the auger safely, or whether to call the maker.

Ash is a feed-side problem too

Pellets that leave a lot of ash can choke the fire. That's a separate cause with its own page, on ash and the pot.

A short order for checking

1. Look at the pellets, as above.
2. Try a fresh bag if they crumble or look dull.
3. Check for ash and clean as your manual describes.
4. Make sure the hopper isn't running low.
5. If the fire still fades, read the page on part faults.

A relit grill needs care. If the fire went out with pellets still in the pot, don't just restart it. Your manual says how to clear the pot and restart, and that matters for safety.

Don't try to light a pellet grill indoors or under cover to finish a cook. Carbon monoxide from any fuel-burning cooker in a closed space can kill.