Carrier HH18HZ195 Rollout Switch (Limit) – OEM Furnace Safety Switch

🔥 Product Overview

The Carrier HH18HZ195 Rollout Switch is a genuine OEM safety device designed to protect gas furnaces from flame rollout conditions. It features a 195°F open / 115°F close mechanism that ensures burners shut off safely if flame spills outside the combustion chamber, preventing potential hazards.

Built to Carrier specifications, this SPST switch delivers reliable operation and long service life. It is essential for maintaining safe furnace function and peace of mind in residential and commercial heating systems.

✅ Key Features

✔ Genuine OEM Carrier rollout switch
✔ SPST (Single Pole Single Throw) configuration
✔ Opens at 195°F, closes at 115°F for precise safety operation
✔ Protects against furnace flame rollout
✔ High-quality components for reliable performance
✔ Direct replacement for Carrier furnaces

📊 Specs Table

⚠ Common Symptoms This Switch Fixes

• Furnace shuts off unexpectedly
• Burners fail to stay lit
• Flame rollout safety trips
• Furnace lockout codes
• No heat with a functional thermostat

❓ Frequently Asked Questions (FAQ)

Q: What does a rollout switch do?
It shuts off the furnace if flames spill outside the combustion chamber to prevent fire hazards.

Q: Can I reset it?
No — this is a manual limit switch. Once tripped, it must be replaced.

Q: Is this switch universal?
No — designed as an OEM replacement for Carrier furnaces.

Q: How do I know if it’s bad?
If the furnace won’t stay lit or repeatedly trips the safety mechanism, this switch is a common cause.

🛒 Shopping Tips

🧭 Match the original Carrier part number before ordering
🧰 Always disconnect power and gas before replacing the switch
⚠ Never bypass a rollout switch — it’s a critical safety device