A good diode displays continuity in one direction only. A defective diode displays continuity in both directions or open circuit in both directions.

How can you tell if a diode is good or bad?

A diode is reverse-biased when the positive (red) test lead is on the cathode and the negative (black) test lead is on the anode. The reverse-biased resistance of a good diode displays OL on a multimeter. The diode is bad if readings are the same in both directions.

Is it possible for diode to check with multimeter?

Digital multimeters can test diodes using one of two methods: Diode Test mode: almost always the best approach. Resistance mode: typically used only if a multimeter is not equipped with a Diode Test mode.