Source 1 S1-7970-3281/A HVAC Furnace Appliance Limit Switch

Restore your appliance's performance with the genuine OEM Source 1 — the factory-certified replacement that fits perfectly and lasts.

Protects your furnace from overheating damage and prevents the blower from circulating cold air at the start and end of a heating cycle. A bi-metal disc or rod element expands as temperature rises, closing the fan contacts at the set "on" temperature and opening the limit contacts at the high-limit temperature to shut off the burner. Installing this certified OEM part ensures your appliance operates exactly as designed, protects your investment, and avoids the reliability risks of aftermarket alternatives.

Product Details

• Product Type: Fan Control / Limit Switch
• Compatibility: Compatible with major appliance and HVAC brands including Whirlpool, Samsung, LG, Carrier, Rheem, Goodman, Trane, and York.
• Manufacturer: Source 1 — Genuine OEM Original Part
• Common Symptoms Fixed: Replace if the furnace overheats and shuts down repeatedly, the blower runs continuously without heat, or a multimeter test shows the switch contacts are open at room temperature

Part# Replaces the Following:

refer to your parts diagram for alternate part numbers

Key Features

Genuine OEM Quality: The Source 1 is an authentic factory-original part, guaranteeing a perfect fit and optimal performance without the guesswork of aftermarket alternatives. Every dimension, connector, and operating specification matches the original exactly.

Restored Performance: Protects your furnace from overheating damage and prevents the blower from circulating cold air at the start and end of a heating cycle. This replacement part brings your appliance back to factory-specified performance levels so you can rely on it every day.

Durable Construction: Built to the same exacting standards as the original component, this part is engineered to withstand the thermal cycling, vibration, and mechanical stresses of daily appliance use — delivering years of reliable service.

Easy Installation: Designed as a direct plug-in replacement with identical connectors, dimensions, and mounting points as the original. No modifications, adapters, or special tools required.

Wide Compatibility: While manufactured by Source 1, this part is compatible with appliances across multiple brands including major appliance and HVAC brands including Whirlpool, Samsung, LG, Carrier, Rheem, Goodman, Trane, and York. One part number solves the problem across a wide range of models.

Don't let a failed fan control / limit switch disrupt your daily routine any longer. Order the Source 1 today and restore your appliance to peak performance — with the confidence that only a genuine OEM part can deliver.