If your Enviro pellet stove is failing to light consistently, running through ignition cycles without catching, or throwing ignition-related fault codes, the ignition temperature sensor is one of the first components to inspect and replace. The EF-015 (also listed as NBK Parts 20106) is the correct OEM-spec replacement for the EF2, EF3, EF3Bi, and EF4 series stoves -- a direct swap that restores reliable start-up performance.
The ignition temperature sensor monitors the heat level at the firepot during the startup sequence. When the sensor detects that the igniter has brought the firepot to the correct temperature, it signals the control board to begin feeding pellets and ramping airflow. A failed or out-of-spec sensor causes the stove to misread that temperature threshold -- resulting in failed ignition attempts, nuisance shutdowns, or error codes on the control panel.
Replacing a worn or faulty sensor with the correct EF-015 part restores accurate temperature feedback to the control board and gets your stove lighting on the first or second cycle again, as designed.
Designed specifically for Enviro pellet stove models EF2, EF3, EF3Bi, and EF4. No modification or adapter required.
Listed as Enviro EF-015 and NBK Parts 20106 -- cross-reference both numbers when sourcing for accuracy.
Weighs just 0.1 lb. -- a small part with a big impact on reliable ignition performance.
Corrects failed starts, extended ignition cycles, and ignition-related fault codes caused by a degraded sensor.
Before replacing the sensor, confirm that the symptoms match. The EF-015 sensor is a likely cause if your EF-series stove shows any of the following:
Sensor replacement on EF-series stoves is a straightforward service task for anyone comfortable working on pellet appliances. General steps include: