What is the best method for checking a hot surface igniter?

The best method for checking a hot surface igniter is by measuring the amp draw. This assessment method offers a direct indication of the igniter's functionality in the circuit. When a hot surface igniter is functioning properly, it will draw a specific amount of current, reflecting that it is heating as intended. If the amp draw is lower than expected, it may indicate a problem with the igniter, such as a crack, which can impede its heating capability. Conversely, an unusually high amp draw could signify a short or other issues that may compromise its performance.

While visual inspection can identify obvious physical damage, it does not provide definitive information regarding electrical performance. Checking resistance can indicate whether the igniter is open or shorted but does not measure its operational performance under normal conditions. Measuring temperature can be informative but may not give as clear an assessment of the igniter's function as amp draw does, especially since the igniter’s role is to reach a certain temperature to ignite the gas. Therefore, monitoring the amp draw provides a more reliable and effective method for assessing a hot surface igniter's health and functionality.