When you're dealing with a system shutdown related to flue gas backup or excessive heat in the blower housing, the Carrier HH680618 230F M/R Vent Safety Switch is the specific high-limit control required for a proper repair. This secondary limit switch is engineered to interrupt the 24V control circuit if vent temperatures hit the 230 degree Fahrenheit threshold, protecting the heat exchanger and surrounding components from thermal damage. As a manual reset vent switch, it ensures that once a high-limit trip occurs, a technician must physically inspect the venting and heat exchanger for blockages or cracks before the furnace can be put back into operation.

The HH680618 is the direct factory-authorized replacement for the discontinued Carrier HH11AZ230, maintaining the exact normally closed (NC) logic and single-pole single-throw (SPST) configuration. This OEM Carrier furnace safety switch features a compact footprint for mounting in tight blower or vent transitions where thermal monitoring is critical. For contractors maintaining older 350, 355, or 340 series model units, stocking these genuine limit switches is essential for resolving intermittent rollout or venting fault codes quickly and accurately.

Key Benefits for Technicians

• Precise Thermal Protection: Calibrated to open at 230°F (+/- 5°F) to prevent catastrophic equipment failure during flue restricted conditions.
• Direct Drop-In Fit: Specifically designed to replace the Carrier HH11AZ230 without the need for additional wiring harnesses or bracket modifications.
• Manual Reset Security: Built-in manual reset button prevents automatic cycling, forcing a professional diagnosis of the underlying ventilation issue.
• High Electrical Compatibility: Rated for standard 24V HVAC control circuits, ensuring low-resistance pathing during normal operation.
• Robust OEM Build: Genuine Carrier replacement part quality ensures long-term reliability in high-cycle furnace environments.

Common Questions

What causes a 230F vent safety switch to trip?
A trip usually indicates a restriction in the venting system, a failing inducer motor, or a compromised secondary heat exchanger causing flue gases to backup. Always check for obstructions in the chimney or vent pipe before resetting.

Can I bypass the HH680618 for testing?
Temporarily jumping the switch for diagnostic purposes is possible, but it must never be left bypassed. This component is a critical safety device designed to prevent fire and carbon monoxide hazards.

Is this switch compatible with my specific Carrier furnace?
The HH680618 fits a wide range of Carrier, Bryant, and Payne furnaces. If your original part number is HH11AZ230, this is the current manufacturer-specified replacement. Verify your model's induction setup to ensure the 230F trip point matches your technical data sheet.

Item is Non Cancelable / Non Returnable

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.