Carrier HH12ZB170 Limit Switch it is recommended to use

it is recommended to use the 1/2" flare nut for a clean mechanical connection or select the dedicated ODF sweat version if brazing is preferred

or "chattering" sounds from the solenoid suggesting inconsistent power delivery

Use a multimeter to check for continuity across the terminals when the system is cool

304100 is the official manufacturer part number (MPN) for the Model F-26 gasket used across several legacy and modern M&M water feeders

replacing the 071-03409-003 red spring restores the mechanical accuracy required for safe combustion

Carrier HH12ZB170 Limit Switch it is recommended to useThe Carrier HH12ZB170 Limit Switch is a critical safety component designed for precise thermal monitoring in high efficiency furnace and air handling units. This OEM replacement limit switch features a fixed temperature range, engineered to open at 170F and automatically reset when temperatures drop to 130F. As an L170 40F thermal switch, it provides essential protection against heat exchanger overheating by interrupting the burner circuit if airflow