this specific model uses Rp metric threading

weak flame signal

preventing hazardous gas buildup during system operation

Common Question: How do I know if the THT2436 is the correct replacement

The 64-inch lead is considered an "extended length" compared to standard 48-inch models

Fenwal 35-665725-121 Ignition Control Els PW 29614 this specific model uses RpThe Fenwal 35 665725 121 Ignition Control is a microprocessor based Direct Spark Ignition (DSI) module designed for the precise management of gas fired heating systems. This 24VAC ignition control provides a robust three try ignition sequence, incorporating a 15 second pre purge, 30 second inter purge, and 30 second post purge to ensure safe combustion cycles. Engineered for high demand environments, it features a built in combustion blower relay and