An error code appears on the display of the FX-971

If the buzzer sounds and an alphabetic error code is shown on the display while using an FX-971, please confirm the following.

Disconnect the power plug from the outlet, and start checking and taking action.
Please contact the store of purchase or Hakko's official distributor if the error does not disappear after you take the necessary action.

Display	Point to be checked / How to handle
	Is the handpiece plug about to be disconnected from the unit(station)? Is the handpiece plug about to be disconnected from the unit(station)? Connect the handpiece to the unit (station) firmly. Is an incompatible handpiece other than FX-9701, FX-9702, FX-9703, and FX-9704 connected? Is an incompatible handpiece other than FX-9701, FX-9702, FX-9703, and FX-9704 connected? After confirming the handpiece is correct, connect the handpiece plug to the unit (station) firmly.
	Is the soldering tip inserted into the handpiece properly until it stops at the end? Is the soldering tip inserted into the handpiece properly until it stops at the end? Insert the soldering tip firmly until it stops at the end. The iron holder FH-215 allows easy and safe tip replacement (attach, detach). Click here for more information. FX-9701, FX-9702 How to replace a tip safely using the iron holder As for the FX-9703 and FX-9704, you cannot attach the tip by using the iron holder. Is the heating element/sensor disconnected? Is the heating element/sensor disconnected? Measure the resistance between the heating element and sensor, and if the measured value is abnormal, replace the tip. 【Measurement point/Normal resistance value】 T39: 5.7 Ω ±10% (at room temperature) T50: 8.0 Ω ±10% (at room temperature)
	The error code is displayed and the buzzer sounds when the tip temperature drops below the set temperature range while soldering. e.g.　Temperature setting: 350℃, Low temperature alarm: 50℃ It warns with an error code and sound when the sensor temperature in the tip becomes lower than 300℃. Please also check whether no poor soldering occurs due to insufficient heat when getting an error notice. Is the tip size suitable for the soldering object? Is the tip size suitable for the soldering object? If the tip size is too small for the soldering object, the tip temperature drops too much due to the poor thermal capacity of the tip. Replace the tip with one that size is suitable for the soldering object. Click here for more information. How to select the right shape and size of the tip for micro soldering Please contact the store of purchase or Hakko's official distributor if you get in trouble with the low temperature alarm.
	Do you use a Hakko genuine soldering tip? Do you use a Hakko genuine soldering tip? Use Hakko's genuine soldering tip.
	Are there any strong noise sources in the working area of the unit? Are there any strong noise sources in the working area of the unit? Use the unit away from the possible noise source.

 Please contact the store of purchase or Hakko's official distributor if you cannot solve the problem by trying the above.