always replace the 47-21900-13 with the exact specified manual reset component

Smith 100208241 Manual Reset Switch is a critical OEM safety component designed for high-efficiency hydronic boilers and commercial water heaters

you need a drop-in replacement that matches manufacturer specs exactly

000VAC) between contacts and coil to prevent internal arcing

For contractors handling gas pressure testing

Weil McLain 383-500-055 Sensor Kit Els PW 17895 always replace the 47-21900-13 withIdentify and resolve lockout conditions with the Weil McLain 383 500 055 Flue Temp Sensor Kit. Designed for Weil McLain Ultra Series 1 and 2 residential gas boilers, this genuine OEM replacement part is essential for monitoring exhaust gas temperatures and maintaining high efficiency performance. When a flue temperature sensor fails or provides erratic resistance readings, the boiler control module typically triggers a safety shutdown to prevent heat