The alumina ceramic insulator prevents high-voltage leakage to the chassis

the device immediately restricts gas escapement to levels well within ANSI Z21

Common signs include unusual screeching noises

If your diagnostic code indicates a "No Flame Ignited" or "Flame Loss" error

What are the signs of a failing hot surface ignitor

Johnson Controls T-3111-1 Valve Actuator 30067439-890 The alumina ceramic insulator preventsThe Johnson Controls T 3111 1 Valve Actuator is a heavy duty, proportional action pneumatic thermostat designed for integrated control of steam or water valves in terminal air conditioning units. This direct acting controller features a liquid filled bulb element with a 42 inch capillary, ensuring precise sensing of return air temperatures. Built for rugged field reliability, the T 3111 1 provides seamless valve top mounting for VG7000 Series valves