If the rod has light soot

an "OL" reading or extremely high resistance indicates a hairline crack in the silicon carbide element

Designed to withstand the thermal cycling inherent in residential and light commercial heat exchangers

Standardized Electrical: Rated for 120/230VAC applications with a 15A/10A current capacity to handle standard inducer or gas valve circuits

Trane KIT9660 Conversion Kit R-410A If the rod has lightThe Trane KIT9660 Conversion Kit is a critical OEM replacement engineered to modernize flame detection in legacy forced air systems. As the direct replacement for CNT1643, this radiant to flame sense conversion kit transitions aging furnace architectures from obsolete radiant sensing to contemporary flame ionization technology. This upgrade is foundational for technicians looking to resolve intermittent ignition failures and improve flame detection