Carrier HH680348 Rollout Limit Switch, 300°F, Manual Reset

Description

Carrier HH680348 Rollout Limit Switch Overview

The Carrier HH680348 is a manual-reset rollout limit switch engineered to protect gas furnaces from the hazards of burner flame rollout. When abnormal combustion causes flames to escape the burner compartment, this safety switch detects the elevated temperature and immediately interrupts the control circuit, shutting down the burner before damage or fire can occur.

Key Features

• Trip temperature: 300°F — calibrated to detect dangerous rollout conditions quickly and reliably
• Manual reset operation — requires a technician to physically reset the switch after a trip, ensuring the root cause is identified and corrected before the system is returned to service
• OEM Carrier replacement part — designed and specified for use in compatible Carrier furnace models
• Durable construction built to withstand the high-temperature environment of the furnace burner compartment
• Direct drop-in replacement to simplify service calls and minimize equipment downtime

Why Manual Reset Matters

Unlike automatic-reset limit switches, a manual-reset rollout switch requires deliberate technician intervention after a fault. This is a critical safety feature — flame rollout is typically caused by a blocked heat exchanger, inadequate combustion air, or a cracked heat exchanger, all of which demand professional diagnosis before the appliance is restarted.

Application

• Compatible with select Carrier gas furnaces — verify compatibility with your specific model before ordering
• Designed for residential and light commercial furnace applications
• Ideal for HVAC technicians performing safety component replacements and system tune-ups

Specifications

• Brand: Carrier
• Part Number: HH680348
• Switch Type: Rollout Limit Switch
• Trip Temperature: 300°F
• Reset Type: Manual Reset