Advanced EMI Protection prevents electrical noise from disrupting sensitive electronic burner controls

the switch likely needs replacement

The parallel blade design

The unit includes a 1/4" male NPT bottom connection for main pressure sensing and a 1/8" female NPT sample line connection for precise air sampling

Supports a wide voltage range of 115V-220V

Carrier HH12ZA211 Limit Switch Refrigerant Advanced EMI Protection prevents electricalThe Carrier HH12ZA211 Limit Switch is a critical safety component designed for precise thermal regulation within residential furnaces and air handlers. This OEM Carrier replacement part functions as a primary high limit safety, monitors internal plenum temperatures, and prevents hazardous overheating conditions. Engineered with an auto reset mechanism, the switch is a Single Pole Single Throw (SPST) normally closed device that opens the electrical