Testing heating element

[manubali]

Hi, i am trying to repair dry herb vaporizer for  my friend. I suspect its heating element is faulty as It works fine when element is disconnected and didn't work when its connected.
I tried to measure resistance between its terminals and it shows 0 ohms.
Is there any other way to test it?
Element is connected to drain terminal of p cahnnel mosfet and element, drain side of mosfet are shorted to ground.

[james_s]

What voltage does it run from? If it's low voltage then it may read zero ohms on a multimeter that doesn't have a low ohms range. A heating element is nothing more than a resistor, the typical failure mode is they burn out and go open circuit. What do you mean by "doesn't work"? Does it blow the fuse? Shut off?

[manubali]

It runs with single 18650 battery around 3.7 volts.
It shuts off after few seconds when power button is pressed.
It was dropped and it stopped

[DTJ]

A dry herb vaporizer running of a 18650?
Is it like an electronic bong?

[james_s]

For such a low voltage I would expect the heating element resistance to read close to zero. Are you sure it's not just a dead battery? Is the charging circuit actually charging it?

[manubali]

For such a low voltage I would expect the heating element resistance to read close to zero. Are you sure it's not just a dead battery? Is the charging circuit actually charging it?

Yes its charging fine, i even tried hooking it to bench power supply.
It have thermistor attached to heating element, i think heater turns on when temperature is low and when micro senses overheating, it just turns it off, and now i think somehow after drop the thermistor got faulty and now its giving false reading thats causing it to trip.

I checked the heater by applying around 4 volts and it heats fine.

[manubali]

A dry herb vaporizer running of a 18650?
Is it like an electronic bong?

Its called g pro vaporizer, its same as vape pen but it have small chamber to put herb in it

[james_s]

The thermistor could easily have been damaged by the drop. You can test it by measuring the resistance, it should go either up or down as you heat it.