The Harman 3-20-677200 is a direct-replacement hot surface igniter engineered for all Harman pellet stove models equipped with automatic ignition. When your stove fails to light or shows an ignition fault, this 306W igniter is the most common fix -- and it swaps in with standard male spade connectors and no modification. Also sold under NBK part number 20110K.
Harman pellet stoves rely on a hot surface igniter to light the fuel bed automatically at startup. Over time, the ceramic heating element cracks or burns out -- typically showing up as a stove that runs the auger and combustion blower but never ignites. The 3-20-677200 restores automatic ignition with a direct OEM-specification replacement.
This igniter fits the full lineup of automatic-ignition Harman models spanning freestanding stoves, inserts, and furnace/boiler systems. If your Harman stove has automatic ignition, this is the correct part. Verify your serial number prefix against the PB105 and PF100 cutoffs listed in the compatibility section before ordering.
Reaches ignition temperature quickly at startup. OEM wattage spec ensures proper light-off without overtaxing the stove's control board.
Plugs directly into the factory harness. No splicing, no adapters. Swap out the old igniter and reconnect in minutes.
Covers the full range of automatic-ignition Harman stoves -- from the Absolute and Accentra series through the P-series, Advance, Allure, and XXV models.
Also listed as NBK Parts 20110K. Order by either number with confidence -- same part, same spec.
This igniter is confirmed to fit the following Harman automatic-ignition models:
This igniter fits PB105 units with serial numbers prior to 008341121, and PF100 units with serial numbers prior to 008350087. Units with higher serial numbers use a different igniter specification. Verify before ordering.
A failed hot surface igniter usually presents as one or more of the following symptoms:
Before replacing, confirm 120V AC is reaching the igniter terminals during the startup cycle. A multimeter check rules out a control board or wiring issue. If voltage is present and the igniter is not glowing, replace the igniter.
Allow the stove to cool completely before servicing. Disconnect power at the outlet or breaker before removing the old igniter. Handle the ceramic element carefully -- impact or dropping can crack a new igniter before installation. Do not touch the ceramic rod with bare skin; oils from skin contact can create hot spots that shorten element life.
Inspect the burn pot and igniter port for clinker buildup each season. Ash and slag packed around the igniter tip restrict airflow and cause the element to overheat, shortening its service life. A clean burn pot extends igniter life significantly.