I am troubleshooting a cooktop spark module. There is a component that looks like a small glass cased diode, but it isn't a diode. There is no band indicating cathode and when removed from the circuit, it measures open both directions. There are no markings on it whatsoever.
There are other diodes on the circuit board, but they are labeled as D1, D2, etc whereas this component is labeled DI1. In the circuit, it is series with a 22 ohm resistor before going to the gate of an SCR.
It is not burned out because the circuit works fine for a while, before the transistor than fires the SCR fails.
Thanks for any ideas!