@bahtah,
Also Ters it could be a defective heater. For instance if it comprises two or tree parallel sections, just one might be open. How do we determine this
Dunno
If you can find another one, working, you can compare resistance or current. Do you have a multimeter
Trouble with multimeter however is that it might not be useful in comparison of of very low resistance values; while the typical unit isn't capable of measuring ac current
You hafta rilly know your stuff