Pellet Stove Won't Ignite? 6 Checks Before Buying Parts

By Walt Hensley · Published September 10, 2026

It’s the first cold night of the season, you flip the stove on, the igniter light comes on, the combustion blower hums… and twenty minutes later you’re staring at a pot full of unburned pellets. Before you order a new igniter — and I’ve watched plenty of people do exactly that — run this checklist in order.

Here’s the thing the parts stores won’t lead with: most “won’t ignite” calls are not a dead igniter. They’re ash packed where air should flow, an igniter that’s slightly out of position, or a stove starving for combustion air. All of those cost zero dollars to fix. So we go in order of probability and cost, and the credit card comes out last.

Safety first, and I mean it: any time you’re putting hands or tools inside the stove — cleaning, pulling connectors, measuring resistance — the stove must be off, completely cold, and unplugged. Let it finish its full shutdown cycle before you pull the plug; unplugging a running stove can spill smoke into the room because the exhaust blower stops before the fire is out. And nothing in this guide involves testing with live wall power. Manufacturers’ service procedures do include live-voltage tests, but those belong to a qualified technician, not a how-to article.

First: is it even feeding?

Watch the burn pot during a start cycle. Are fresh pellets actually dropping in?

If the pot stays empty, you don’t have an ignition problem — you have a feed problem, and it’s usually a jam, pellet bridging, or a safety switch doing its job. That’s a different diagnosis: see the auger troubleshooting guide and come back here once pellets are flowing.

If pellets drop but never light, keep reading.

Step 1 — Clean the burn pot (and the holes in it)

This is the number one cause, and it’s free.

Pellet fire needs air coming up through the burn pot. The pot has a grid of small holes in the floor and sides, and there’s usually an air chamber or clean-out cavity underneath. When those holes crust over with ash and carbon — or the chamber below fills with fines — the igniter can glow red-hot all day and the pellets will just sit there smoking. Owners on the stove forums describe replacing the igniter and the burn pot before someone points out the plugged holes underneath.

With the stove cold and unplugged:

1. Scrape the burn pot floor and sides well. The goal is breaking up the carbon glaze so air moves freely — not stripping every trace of material (Harman’s manual says as much: whatever you loosen gets pushed out with the new fuel).
2. Poke every hole clear. A pick, a small screwdriver, or a piece of coat hanger works.
3. Open the burn pot clean-out (most stoves have one) and vacuum out the cavity underneath. Use an ash vacuum or a shop vac with a fine-dust filter — never a household vacuum.
4. While you’re in there, check the gasket around the pot seats properly.

Harman’s own manuals tell you to scrape the pot essentially every time you add fuel, and to inspect the holes at every deep clean — that’s how central this is. If your stove hasn’t had a proper deep clean since last season, do that before anything else.

Try a start cycle. A surprising number of you won’t need Step 2.

Step 2 — Does the igniter actually glow?

Now we test the igniter itself, in two stages: a glow test, then a resistance test.

The glow test. With the burn pot empty and clean, start the stove and watch the pot (some stoves let you watch through the glass; on others, look for the air inlet hole where the igniter sits). Within a few minutes of the start cycle you should see a spot of orange-red heat, and pellets dropped onto it should begin to smoke. As a community rule of thumb — this is owner experience, not a manufacturer spec — you’ll typically see smoke in the first 3–5 minutes and flames not long after. Controllers are far more patient than that before they declare failure: a Harman P43, for instance, runs a 36-minute start cycle before it gives up and flashes an error (per the P43 owner’s manual). So “it takes a bit longer than YouTube said” is not a failure. No glow at all, or a cycle that times out into an error code, is.

The resistance test. This is how you confirm a dead igniter before buying one, and it takes a $15 multimeter. Stove cold and unplugged, disconnect the igniter’s connector and measure resistance (ohms) across its two leads:

• Typical range: roughly 35–60 Ω — but check your model’s specification. Resistance depends on the igniter’s wattage and design. For reference, PelPro’s official service guide specifies about 48 Ω for its PP60/PP70/PP130 igniter test; owner reports for other brands commonly land in the 40–50 Ω neighborhood. And there are legitimate outliers — some designs spec in the low 20s — which is exactly why the number in your manual beats any generic range, including this one.
• An open circuit (infinite/OL reading) means the element is burned out. That’s a dead igniter, and now — only now — buying one makes sense. Typical cartridge igniters run $40–80.
• A reading wildly outside your model’s spec also points to a failing element.

The position check. Here’s the sneaky one: an igniter can be electrically perfect and still fail to light the stove because it’s not sitting where it should. The element has to be positioned so the start-up airflow carries its heat into the pellets — centered in its tube, at the right depth. If yours was replaced or removed for cleaning recently, compare its position against the diagram in your manual. Owners have chased “bad” brand-new igniters that were simply installed a half-inch off.

Step 3 — Airflow: the combustion blower and the vacuum switch

No air, no fire — even with a perfect igniter and a clean pot.

When you start the stove, the combustion blower should spin up (you’ll hear it). That blower creates the draft that pulls air through the burn pot holes and past the igniter. If it’s caked with fly ash, weak, or dead, ignition gets slow or impossible — and on many stoves a small safety device called the vacuum switch (or pressure/draft switch) steps in when it doesn’t see enough draft. What exactly it interrupts depends on the architecture: on Harman’s P43, the manual states poor draft cuts power to both the feeder and the igniter; other brands wire the switch into the sequence differently. Your manual’s wiring diagram has the specifics — the practical takeaway is the same either way: restore the airflow and the switch stops intervening.

What’s owner-serviceable here, cold and unplugged:

• Clean the combustion blower wheel (it’s part of the standard deep clean).
• Check the exhaust path and outside air inlet for blockage — ash buildup, a stuck damper flap, even a bird’s nest in the vent cap after summer.
• Make sure every door and the hopper lid are fully latched. An unsealed opening kills draft, and on many stoves an open lid trips its own safety switch.

What’s not DIY: bypassing or jumpering the vacuum switch, and any electrical testing of the switch or blower under power. If the airflow path is clean and sealed and the stove still acts starved, that’s technician territory.

Step 4 — Voltage and the outlet

The forgotten one. Igniters are resistive heating elements, and they’re sensitive to low voltage: an igniter fed through a sagging extension cord or an overloaded circuit runs cooler than designed — sometimes just cool enough to miss ignition, which produces a maddening “sometimes it lights, sometimes it doesn’t” pattern. There are documented forum cases where the fix was simply plugging the stove directly into a proper outlet.

• Plug the stove directly into a wall outlet — no light-duty extension cords, no crowded power strips.
• If your outlet is questionable or your lights dim when the stove starts, have an electrician look at the circuit. (That’s a wiring job, not a stove job.)

When it’s the control board (rare)

Boards do fail, but they’re the last suspect, not the first. The scenario that points toward the electrical side: the igniter tests fine with the meter, airflow is clean and sealed, voltage is good — and the stove still never energizes the igniter (no glow, no igniter indicator light), or it throws board-level error codes.

Even then, “no power to a good igniter” doesn’t automatically mean the board: wiring, connectors, a fuse, or a safety interlock (that vacuum switch again, or a hopper lid switch) can all cut igniter power, and a technician will rule those out before condemning the control. All of that diagnosis involves live-voltage measurements, so this is where I stop and a technician starts.

When to call a tech

Call a certified pellet stove technician (look for NFI certification) when:

• The resistance test says the igniter is fine but it never gets power.
• The vacuum switch or combustion blower needs actual electrical diagnosis.
• Error codes persist after the reset procedure in your manual.
• Venting work beyond the routine cleaning your manual assigns to you. Owner manuals (Harman and PelPro included) do put brushing and vacuuming the flue through the built-in cleanouts on the owner’s schedule — that part is yours. Repairs, re-routing, disassembling vent sections, or anything you’d need to improvise access for is a job for a certified sweep or tech.

I’m not a technician myself — fifteen-plus winters of running these stoves has mostly taught me which problems are cleaning problems (most of them) and which ones aren’t worth gambling a house fire over.

Quick reference: cause → test → cost

FAQ

Why is my pellet stove not lighting? In rough order of likelihood: ash blocking the burn pot holes or the chamber under the pot, a dirty or blocked combustion-air path, an igniter that’s out of position, low voltage from an extension cord, and only then an actually dead igniter. Work the list top to bottom before buying parts.

How do I know if my igniter is bad? Two tests, stove cold and unplugged. Glow test: no visible glow during a start cycle is suspicious. Resistance test: disconnect the igniter and measure ohms — an open circuit means it’s dead; compare any other reading against your model’s spec (typical range is ~35–60 Ω, but check your manual, since some designs legitimately read outside it).

How long should a pellet stove take to ignite? Owner experience says smoke within about 3–5 minutes of pellets meeting a glowing igniter, flames shortly after. The controller allows much longer before declaring failure — Harman’s P43 runs a 36-minute start cycle before it errors out. Slower-than-usual ignition usually points to a dirty pot or weak airflow rather than a dead igniter, which typically fails all-or-nothing.

Walt Hensley — I’ve heated my home in northern New England with a pellet stove for more than fifteen winters. Pellet Owner is where I write down what I’ve learned from owner’s manuals, stove shops, and my own mistakes — what you can safely fix yourself, and when it’s time to put the screwdriver down and call a certified technician.