Pellet Stove Not Igniting: Igniter, Auger, Burn Pot, and Combustion Blower Diagnosis

Common Symptoms

• Stove powers on but pellets drop into the burn pot without igniting
• Stove attempts ignition then shuts down with an error code
• Ignition cycle completes but flame immediately goes out
• Auger is running but no pellets are reaching the burn pot
• Stove starts normally but shuts off within 5 minutes of ignition
• No glow visible in the burn pot during the ignition cycle

Most Likely Causes

1. 1

   Failed Hot Rod Igniter (Most Common)

   The hot rod igniter (also called an igniter rod or ceramic igniter) is an electrically heated element that sits in or below the burn pot and glows red-hot to ignite incoming pellets. Igniters typically last 2–5 years and fail gradually — first taking longer to heat up, then failing to reach ignition temperature, and finally not heating at all. A failed igniter is the single most common cause of a pellet stove that won't light. You can confirm the igniter is working by watching the burn pot area during the ignition cycle (in dim light, you should see an orange-red glow) or by testing the igniter's electrical resistance with a multimeter.

2. 2

   Clogged Burn Pot — Ash and Clinker Buildup

   The burn pot is a perforated metal cup or tray where pellets fall and combust. The small air holes in the burn pot allow combustion air (from the combustion blower below) to reach the pellets. If these holes become clogged with ash, fine particulates, or clinkers (fused ash and unburned mineral deposits), combustion air cannot reach the pellets and the fire will not establish. Burn pot cleaning is the single most important routine maintenance task for a pellet stove — it should be inspected after every 1–3 days of use and cleaned weekly during heavy use seasons.

3. 3

   Combustion Blower Failure or Restricted Airflow

   The combustion blower (also called the draft inducer or exhaust blower) draws air through the burn pot and pushes combustion gases out through the exhaust flue. If the combustion blower fails, slows (due to bearing wear or ash buildup on the impeller), or if the exhaust vent is blocked, the stove's pressure switch (vacuum switch) will detect insufficient draft and prevent ignition as a safety measure. Many pellet stoves will display a 'pressure switch' or 'draft' error code when this occurs. Test by listening for strong blower noise during the ignition cycle and checking that exhaust air is flowing from the vent termination outside.

4. 4

   Auger Jam or Auger Motor Failure

   The auger is a spiral screw that rotates to transport pellets from the hopper to the burn pot. Auger jams are caused by oversized pellets, debris (nails, plastic bags, dirt), or swollen pellets from moisture exposure. An auger jam stops pellet feed entirely — the igniter may glow but no fuel arrives to ignite. Auger motor failure (rare but possible after years of use) has the same result. You can check for auger operation by listening for the auger motor's characteristic grinding/turning sound during the feed cycle and visually watching whether pellets appear in the burn pot.

5. 5

   Low-Quality, Wet, or Old Pellets

   Pellets that have absorbed moisture (from storage in a humid area, torn bag, or wet hopper) swell and become difficult to ignite, and may also jam the auger. Old or low-grade pellets (high ash content) produce excessive clinker buildup, clogging the burn pot holes rapidly. Premium hardwood pellets with low ash content (under 1%) are significantly easier to ignite and maintain. If you suspect wet pellets, check by pressing a handful firmly — they should not crumble or feel soft. Wet or old pellets should be discarded rather than burned.

6. 6

   Vacuum Switch (Pressure Switch) Failure or Obstruction

   Most pellet stoves have a vacuum or pressure switch that confirms the combustion blower is moving adequate air before allowing the ignition sequence to proceed. A failed or stuck vacuum switch will prevent ignition even when the blower is working normally. Ash can clog the small rubber tube that connects the switch to the exhaust pathway. This typically causes an error code displayed on the control board. Test by disconnecting the vacuum switch tube and blowing it clear with compressed air — if the stove then ignites, the tube was clogged.

Quick DIY Checks

1. 1SAFETY FIRST — before any internal inspection: turn the stove OFF at the power switch and unplug the power cord from the wall outlet. Wait at least 15 minutes for the burn pot and internal components to cool before reaching inside. Never place your hand near the auger intake while the stove has power — the auger can activate unexpectedly and cause serious injury. Always disconnect power before clearing auger jams or touching internal components.
2. 2Clean the burn pot completely: with the stove fully cool and unplugged, remove the burn pot (it typically lifts straight out — consult your owner's manual). Use a stiff bristle brush or small wire brush to scrub all ash and clinker deposits from the burn pot, clearing every air hole. Hold the burn pot up to a light source — you should see light through each hole. Also vacuum the ash from the firebox floor beneath where the burn pot sits. Reinstall the clean burn pot, plug the stove in, and attempt ignition. A clogged burn pot is responsible for a large percentage of ignition failures.
3. 3Watch for igniter glow during ignition cycle: plug the stove in and start a normal ignition cycle. During the ignition phase (typically the first 5–15 minutes of startup), look into the burn pot area through the glass door in dim lighting. You should see an orange-red glow from the igniter rod beneath or in the burn pot. No glow = failed igniter. Weak or delayed glow = igniter is beginning to fail. If you have a multimeter, test the igniter resistance: disconnect the igniter wires and measure resistance across the igniter terminals. A healthy igniter typically reads 40–80 ohms — an open circuit (OL or infinite) or very high reading indicates a failed igniter needing replacement.

1. 4Verify pellets are feeding from the hopper: during the ignition cycle (stove powered on), listen for the auger motor — it makes a steady grinding or rotating sound as it turns. Look through the ash door or burn pot area to confirm pellets are dropping into the burn pot. If you hear no auger sound or no pellets are arriving, open the hopper and look down at the auger inlet — check for a bridge (pellets stuck together forming an arch over the auger) or visible debris. Break up any bridges with a stick or your hand. Never reach into the auger while the stove has power.
2. 5Check for an auger jam (with power disconnected): if pellets are not feeding, disconnect power completely and allow to cool. Access the auger through the back panel or as described in your owner's manual. Try to manually rotate the auger by hand — it should turn with moderate resistance. If it is completely locked and won't turn, the auger is jammed. Clear the jam by removing the back access panel (consult your manual), extracting the obstruction from the auger chamber, and manually rotating the auger to confirm it is free. Reassemble, restore power, and test.
3. 6Test combustion blower operation and exhaust flow: during the ignition cycle, listen for the combustion blower — it should produce a strong, steady suction sound from the exhaust side. Go outside and hold your hand near the exhaust vent termination — you should feel warm air flowing out. No airflow indicates a failed combustion blower, a blocked exhaust vent, or a stove that shut down before reaching blower operation. If the exhaust vent is accessible, inspect it for blockages (ash deposits, bird nests, ice in winter). Clean the combustion blower impeller blades of ash deposits with a brush (with power off) if the blower appears to be running slowly.
4. 7Clear the vacuum switch tube: locate the vacuum switch (usually a small round component with a rubber tube attached, on the control board area or near the exhaust blower). Disconnect the rubber tube from the switch and blow through it with a can of compressed air or your mouth — clear any ash or condensate from the tube. Reconnect the tube and test ignition. If your stove shows a 'pressure switch' error code and the combustion blower is running normally, a clogged vacuum switch tube is the most likely cause.
5. 8Test manual ignition as a temporary diagnostic: if the igniter appears to be the only failed component, you can manually ignite the stove as a temporary measure to confirm the rest of the system is functioning. With the stove powered on and the auger running (but igniter disconnected or failed), load a small amount of fire starter gel or natural fire starter on the burn pot and light it with a long-stem lighter through the access door. If the stove catches and runs normally with manual ignition, the hot rod igniter is confirmed as the sole problem and needs replacement. Order a replacement igniter matched to your stove model — igniters are $20–$50 and straightforward to replace.

Repair vs Replace

Recommended Tools & Parts

• Pellet Stove Hot Rod Igniter

  Replacement ceramic hot rod igniter for pellet stoves. The most common failure point — causes inability to ignite without error codes pointing elsewhere. Verify your stove model for correct wattage and length specifications before ordering.

  $20–$50

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• Auger Motor Replacement

  Replacement auger motor for pellet stoves. Matches most brands and RPM specifications. Resolves pellet stoves where the auger does not turn and jams have been ruled out.

  $50–$130

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• Pellet Stove Combustion Blower

  Replacement combustion (exhaust/draft inducer) blower for pellet stoves. Resolves pressure switch errors and poor ignition caused by insufficient exhaust draft. Match to your stove brand and model number.

  $60–$180

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• Pellet Stove Ash Vacuum

  High-temperature HEPA ash vacuum for cleaning burn pot, firebox, and exhaust passages. Standard vacuums are not rated for hot or fine ash — a dedicated ash vacuum prevents damage and health hazards from fine particulate.

  $40–$100

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• Pellet Stove Glass Cleaner

  Ceramic glass cleaner formulated for pellet and wood stove glass. Removes soot and pyrolytic deposits without scratching the ceramic glass panel. Regular cleaning maintains visibility and allows monitoring of burn quality.

  $8–$18

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Links are Amazon affiliate links (tag: fixitfastai-20). Prices are estimates.

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