Tankless maintenance , flushed unit and cleaned all filters . furnace maintenance Install strapping to venting on furnace that didn’t previous have strapping . Adjusted water flow for humidifier and replaced 3 feet of drain tubing from humidifier due to kink from install . Furnace is operating very well with no issues found . Circuit board had just one an error of 290 ( hot surface igniter fault .) tested igniter ohms at 47.5 ( when cold ) and 0.65 amps while lighting .