The Harman 3-20-00906 is the factory-spec room temperature sensor for a wide range of Harman pellet stoves. It feeds ambient room temperature data to the stove's control board so the unit can maintain your setpoint accurately. If your stove is short-cycling, running continuously, or displaying temperature-related error codes, a failed room sensor is one of the first components to check. This sensor ships with a full 60-inch braided wire lead so it reaches the control compartment without splicing, and terminates in standard 1/4-inch female spade connectors for a no-tools plug-in replacement.
The 3-20-00906 is an OEM-equivalent room temperature sensor designed specifically for Harman pellet stove control systems. The control board uses this sensor's resistance readings to regulate combustion and blower speed in real time. When the sensor drifts or fails, the stove loses the ability to hold a steady room temperature -- leading to overheating, erratic shutdowns, or a unit that simply won't fire up past a certain mode.
Installation is straightforward: disconnect the old sensor from its spade terminals, route the new 60-inch lead the same way, and plug in. No soldering, no special tools, and no calibration required. The control board recognizes the new sensor automatically on the next startup cycle.
Full 60 inches of 18-2 braided wire gives you enough reach to route cleanly from the sensor mounting point to the control board without extension or splicing.
Standard 1/4-inch female spade terminals connect directly to the control board harness. No soldering or crimping needed.
Fits more than 20 Harman pellet stove models spanning multiple decades of production, from the Accentra series through the P-series and PF-series units.
Cross-listed as NBK Parts number 20224. If you sourced this part through a parts distributor under that number, this is the same sensor.
The room temperature sensor is a thermistor -- a resistor whose electrical resistance changes predictably with temperature. Over time, heat cycling, vibration, and corrosion at the spade terminals can cause the sensor to read inaccurately or fail open/short. Common symptoms of a bad sensor include:
This sensor is confirmed to fit the following Harman pellet stove models: