English 
中文简体Hot Surface Igniter
A Ceramic Igniter Heater Spark Electrode lights gas in gas burner, furnace or boiler appliances by heating it to a certain temperature. Most are made from silicon nitride or silicon carbide ceramic. A hot surface ignitor is one of the most commonly used electronic ignition systems today.
How It Works
Most furnaces have two ignitors: a pilot ignitor that attaches to a small metal tube that reaches from the gas control valve into the first heater and an ignition ignitor that sits on the wall near the first heater. Some furnaces also have a flame sensor attached to the igniter.
How to Check It
The simplest way to check a ceramic hot surface ignitor is with a multimeter that can read cold resistance values of 10 to 200 ohms (at room temperature 2123degC). Disconnect the igniter from the control board and use the multimeter to measure the resistance at the two electrodes. A reading of greater than 75 ohms indicates that the igniter is broken and needs to be replaced.
How to Clean It
The probe on a spark ignitor can get coated in soot, which prevents it from properly generating a spark. Blasting it with pressurized air can remove this coating.
A spark ignitor is different from a hot surface ignitor, which gets dirty as it heats up and touches the gas in your heater. A spark ignitor can get coated in carbon deposits, which you can also remove by blowing the ignitor probe with pressurized air.
