Furnace Plenum Thermostat for Lennox, Rheem, 47-21711-11, SHL525

Gas Limit Furnace Thermostat | SHL525 | Replaces Lennox 47-21711-11 | OEM-Compatible

Ensure safe and efficient furnace operation with this brand-new SHL525 gas limit thermostat. Designed to replace Lennox® part number 47-21711-11, this high-limit switch helps protect your heating system by interrupting burner operation when internal temperatures exceed safe thresholds. Built to OEM specifications, it offers reliable thermal protection and long-lasting performance in residential and light commercial gas furnaces.

⚙️ Features & Benefits:

• ✅ OEM-compatible replacement for Lennox high-limit thermostat
• Opens at designated temperature to prevent overheating
• Durable construction with secure mounting tabs
• Brand New – Unused and ready to install
• Compact design for easy replacement and universal fit

Replaces Part Numbers:

47-21711-11

✅ Fits Models:

Compatible with select Lennox 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.