internal winding failure is likely

With a 24-inch lead length and a standard 11/32-32 male connector nut

or the control board flashing a code for "low flame signal" despite a visible burner flame

You can verify this by checking the resistance across the terminals with a multimeter

Lochinvar & A.O. Smith 100208475 Connector 318172-701 internal winding failure is likelyWhen you're dealing with a communication fault or a total system lockout on a high efficiency unit, the Lochinvar & A. O. Smith 100208475 Board Connector is a critical point of failure to inspect. This genuine OEM connection board, which replaces legacy part numbers RLY20066, RLY20066K, and 100167582, serves as the primary interface between the main control module and peripheral system sensors. Engineered for the Lochinvar Crest (models CHN and CHL)