Carrier HVAC HH12ZZ165 Limit Switch, Auto Reset, SPST, Opens 165F, Closes 125F

A Carrier HVAC HH12ZZ165 Limit Switch breaks the circuit at high temperatures and restores function once conditions cool.

• Real OEM switches and buttons align cleanly with factory mounting and connections for an exact fit that installs without guesswork
• Fits Popular Models: 59SP2A120E241120, PG92ESAA60120DAA, 59SP2A120E24--20
• Product Type: Limit Switch
• Contact Configuration: SPST
• Switch Action: Auto Reset
• Opens At: 165F
• Closes At: 125F

Common Questions and Answers

What function does the Carrier HVAC HH12ZZ165 Limit Switch serve in the system?

The limit switch monitors furnace temperature and opens the circuit at 165F to interrupt operation when the heating and cooling unit begins to overheat, then automatically restores the circuit once temperatures drop to 125F. Its SPST configuration and auto-reset design provide dependable, repeatable thermal protection that supports safe cycling and consistent performance in the HVAC system.

What signs indicate that the Carrier HVAC HH12ZZ165 Limit Switch could be failing?

The limit switch may be failing if the furnace shuts down unexpectedly, cycles erratically or does not restart properly after reaching normal operating temperature. Physical signs can include discoloration, heat damage or worn terminals and environmental signs may include excess dust buildup, restricted airflow or repeated overheating conditions around the heating and cooling equipment.