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The error indication appears, and the unit does not work. Why?
One of the following three causes is likely.
1. Is the sensor burned out?
Measure the resistance between the heating element and the sensor. The normal range is 8Ω ±10%. If the tester display shows "∞", replace the soldering tip. The sensor is burned out.
Measure the resistance between the heating element and the sensor. The normal range is 8Ω ±10%. If the tester display shows "∞", replace the soldering tip. The sensor is burned out.
2. Is the soldering tip seated all the way into the sleeve assembly?
When inserting the soldering tip into the sleeve assembly, push it all the way in the assembly until it clicks.
If the soldering tip is not well seated inside the sleeve assembly, the same error indication appears.
When inserting the soldering tip into the sleeve assembly, push it all the way into the assembly until it clicks. If the soldering tip is not well seated inside the sleeve assembly, the same error indication appears.
3. Has the soldering iron that was formerly connected been replaced with another one?
A. When the T12 Series tip is used in the offset mode
It is likely to be faulty. Send the unit for repair.
 
B. When the T7 Series soldering tip is used in the soldering tip ID mode
The cause of the error indication could be the change in soldering iron to be connected. If it is the case, the procedure shown below can fix the problem. Please check the unit by following the example procedure below.
 
Figure A
In this example, it is assumed that the error indication appears after the HAKKO FM-2022 which had been originally connected was replaced with the soldering iron HAKKO FM-2027. In this example, it is assumed that the error indication appears after the HAKKO FM-2022 which had been originally connected was replaced with the soldering iron HAKKO FM-2027.
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Figure B
The connected iron HAKKO FM-2022 was replaced with the HAKKO FM-2027. Besides, when the HAKKO FM-2027 was connected with the unit, the soldering tip (T7 Series) had already been attached to the HAKKO FM-2027. The connected iron HAKKO FM-2022 was replaced with the HAKKO FM-2027. Besides, when the HAKKO FM-2027 was connected with the unit, the soldering tip (T7 Series) had already been attached to the HAKKO FM-2027.
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Figure C

If the unit is in the soldering tip ID mode, the error indication is displayed in the following order.
If the unit is in the soldering tip ID mode, the error indication is displayed in the following order.
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Figure D
This time it was changed to HAKKO FM-2027 (with the soldering tip attached). Pull out the soldering tip (T7 Series) and make the unit read the soldering tip ID. Then the buzzer beeps once.
The unit cannot read the ID of T12 Series tips.
Difference between T7 Series tips and T12 Series tips
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Figure E
Attach the soldering tip. Attach the soldering tip.
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Figure F
The temperature goes up to reach the set temperature.

The temperature goes up to reach the set temperature.