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The display shows only "- - 2", and the soldering tip does not heat up. Why?

The heater is likely blown out. Check that the heater is not blown out by measuring the heater resistance.

Measurement position

-When resistance value is out of normal range   The heater is blown out. Replace the soldering tip with a new one.
-When resistance value is in normal range   It is likely that a failure has occurred inside the station. Send the unit for repair.
* When sending the unit for repair, please send the station, handpiece and soldering tip as a set.