Carrier HH18HB031 Freeze Thermostat SPST, Open 30 Closes 45

The Carrier HH18HB031 Freeze Thermostat SPST, Open 30 Closes 45 is a Carrier thermostat for HVAC repair and replacement work. Use it when the part number HH18HB031 and the listed specifications match the equipment being serviced.

HH18HB031 is an official OEM Freeze Thermostat SPST Open 30, Closes 45 for Carrier HVAC equipment

Key Specs

• Product Type: Thermostat

Fitment Notes

Captured equipment fit data references models including 40QAC036300, 40QAC036311, 50XCA06AAPD5AD0, 50XCA06AAPD6AE0, 50XCA06AAPE5AE0, 50XCA06AAPE6AE0, PA1REA036000ABWA, PA1REA036000ABWB, PA1REA048000AAWA, PA1REA048000AAWB, PA1REA048000ABWA, PA1REA048000ABWB. Verify the complete unit model and service manual before installation.

Expert Verdict

Reviewed by the SuperArbor Pro Desk: choose this part when the existing component label and unit documentation match HH18HB031 and the spec set above. It is best suited for targeted HVAC service repairs where exact fitment matters more than broad universal compatibility.

FAQs

What is the Carrier HH18HB031 used for?

It is a thermostat for compatible Carrier HVAC equipment. Match the part number HH18HB031 and the equipment service literature before ordering or installing.

Which specs should I verify before purchase?

Verify the spec set shown for this part: Product Type: Thermostat. The replacement should match the existing component and the unit documentation.

How do I confirm this is the right replacement?

Compare the part number HH18HB031, the thermostat description, and any unit model references with the original component and the service manual.

Which equipment models are referenced in the fit data?

Captured fit data references models such as 40QAC036300, 40QAC036311, 50XCA06AAPD5AD0, 50XCA06AAPD6AE0, 50XCA06AAPE5AE0, 50XCA06AAPE6AE0. Treat this as a fitment aid and verify the complete model list in the equipment documentation.

Who should install this HVAC component?

A qualified HVAC technician should install and test the thermostat. Disconnect power first, follow lockout procedures, and confirm safe operation after replacement.

Safety and Installation Notes

Disconnect power before service. HVAC electrical and combustion-related components should be installed and tested by a qualified technician. After installation, confirm wiring, mounting, airflow or fluid routing as applicable, and normal system operation.