Carrier HH79NZ057 Thermistor, Used with Low Ambient Control

Description

Carrier HH79NZ057 Thermistor Overview

The Carrier HH79NZ057 is an OEM replacement thermistor designed for use with low ambient control systems on Carrier air conditioning and heat pump equipment. This precision temperature-sensing component monitors outdoor ambient conditions, enabling the low ambient control to modulate or cycle the condenser fan and maintain proper refrigerant head pressure during cold-weather operation. Replacing a failed or degraded thermistor restores accurate temperature feedback to the control circuit, protecting system performance and preventing nuisance lockouts.

Key Features

• OEM Carrier replacement thermistor — exact-fit for compatible Carrier equipment
• Designed for use with low ambient control systems
• Provides accurate outdoor ambient temperature sensing
• Supports proper head pressure management during low ambient conditions
• Helps prevent nuisance faults and compressor damage in cold-weather operation
• Direct replacement for reliable, long-lasting performance

Application

The HH79NZ057 thermistor is used in conjunction with Carrier low ambient controls found on select commercial and residential split-system air conditioners and heat pumps. It is typically installed in the outdoor unit to sense ambient air temperature and communicate that data to the low ambient control board or module.

Why Replace Your Thermistor?

A faulty thermistor can cause inaccurate temperature readings, leading to improper fan cycling, reduced efficiency, or system faults. Replacing the thermistor with a genuine Carrier OEM part ensures the low ambient control operates as designed, maintaining system reliability across a wide range of outdoor temperatures.

Specifications

• SKU: HH79NZ057
• Brand: Carrier
• Component Type: Thermistor
• Application: Low Ambient Control Systems
• Part Type: OEM Replacement