Furnace Plenum Thermostat for GE, General Electric, SWT1258

Gas Limit Furnace Thermostat | SHL506 | L170-40F | Replaces General Electric SWT1258, HH12ZB170, 47-25349-02

Protect your heating system from overheating with this brand-new SHL506 gas limit furnace thermostat. Rated L170-40F, this high-limit switch opens at 170°F and resets at 130°F, helping maintain safe operating temperatures in residential and light commercial gas furnaces. Designed to replace General Electric® part number SWT1258, it offers reliable thermal protection and OEM-grade performance.

⚙️ Features & Benefits:

• ✅ Opens at 170°F and resets at 130°F (40°F differential)
• Designed for use in gas furnaces and HVAC systems
• Durable construction with secure mounting tabs
• Brand New – Unused and ready to install
• Compact design for easy replacement and universal fit

Replaces Part Numbers:

SWT1258, HH12ZB170, 47-25349-02

✅ Fits Models:

Compatible with select General Electric gas furnace models. Please refer to your unit’s service manual or model tag to confirm compatibility.

️ Installation Tips:

• Disconnect power and shut off gas supply before servicing
• Locate the existing limit thermostat on the furnace heat exchanger or plenum
• Remove mounting screws and disconnect wire terminals
• Install new thermostat in the same orientation and reconnect wires securely
• ✅ Restore power and gas, then test furnace operation and safety cutoff

Reliable protection. OEM-grade safety. Restore your furnace’s performance with this high-limit thermostat replacement.