How do I verify if this coil is shot

7/8" Sweat Connections: Durable copper-to-copper ODF fittings ensure leak-free brazing into heavy-duty liquid lines

reducing scale buildup inside the humidifier housing

this Danfoss MP54 provides a fixed differential setting

Laars Heating Systems R0491300 Ignition Module 318518-761 How do I verify ifThe Laars Heating Systems R0491300 Ignition Module is a critical microprocessor based hot surface ignition control designed for precise combustion management in high efficiency boilers and pool heaters. Formally cross referenced and identical to the Fenwal 35 652933 115, this 24VAC HSI control module provides reliable trial for ignition (TFI) sequences with integrated safety timings, including a 15 second pre purge and 15 second inter purge.