Furnace Plenum Thermostat for Lennox & York, 47-21711-01, 025-29041-002, SHL520

Gas Limit Furnace Thermostat | SHL520 | Replaces Lennox & York | 47-21711-01, 025-29041-002

Protect your heating system with this brand-new SHL520 gas limit furnace thermostat. Designed to replace Lennox® and York® part numbers 47-21711-01 and 025-29041-002, this high-limit switch helps prevent overheating by interrupting burner operation when temperatures exceed safe thresholds. Built to OEM specifications for reliable performance and long-term durability.

⚙️ Features & Benefits:

• ✅ OEM-compatible replacement for Lennox and York gas furnaces
• Opens at designated high-limit temperature to ensure safe operation
• Durable construction with secure mounting tabs
• Brand New – Unused and ready to install
• Compact design for easy replacement and universal fit

Replaces Part Numbers:

47-21711-01, 025-29041-002

✅ Fits Models:

Compatible with select Lennox and York 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.