Honeywell 107408 Heat Conductive Compound It is designed to interface

It is designed to interface seamlessly with 1/4" pilot tubing

Direct 620858R Replacement: Corrects common system power issues by replacing failed 4021F and 620858R units (verify lead-to-spade conversion)

opening the circuit at 150°F and automatically closing at 110°F to prevent heat exchanger overheating

inspect the heat exchanger for cracks and the flue for obstructions before pressing the manual reset button

the limit switch is likely stuck open or tripping prematurely

Honeywell 107408 Heat Conductive Compound It is designed to interfaceThe Honeywell 107408 Heat Conductive Compound is a professional grade thermal interface material designed specifically for HVACR service technicians. This 4 ounce can provides a high consistency heat transfer grease essential for ensuring accurate temperature sensing in immersion wells and aquastat controllers. By eliminating air gaps between the sensing bulb and the well wall, this compound significantly reduces thermal resistance, preventing erratic