An error code appears on the display of the FX-973

If the buzzer sounds and an alphabetic error code is shown on the display while using an FX-973, 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
Soldering iron error	Are the handpieces connected to the channels? Are the handpieces connected to the channels? If there is a channel that the handpiece is not connected to, press and hold its channel button for 2 seconds to turn off the power. When a channel is turned off, "OFF" will be displayed. 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 plug to the unit (station) firmly. Is an incompatible handpiece other than FX-9701, FX-9702, FX-9703, FX-9704, FX-9705, FX-9706, FX-9707, FX-9708 and FR-4103 connected? Is an incompatible handpiece other than FX-9701, FX-9702, FX-9703, FX-9704, FX-9705, FX-9706, FX-9707, FX-9708 and FR-4103 connected? After confirming the handpiece is correct, connect the handpiece plug to the unit (station) firmly.
Sensor error	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. *In the case of T39, the approximate length from the nipple to the ring (protrusion) on the tip is about 9 mm. The iron holder FH-215/FH-220 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, FX-9704, FX-9705 and FX-9706, 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) T51： 5.7 Ω ±10% (at room temperature) T50： 8.0 Ω ±10% (at room temperature) T52： 7.5 Ω ±10% (at room temperature) T53： 2.9 Ω ±10% (at room temperature) FR-4103： 3.9Ω±10%（at room temperature）
Low temperature alarm	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.
Heater drive error	We are notifying you of a power supply error to the heater. We are notifying you of a power supply error to the heater. Turn on the power switch again.
Heater terminal short circuit error	Do you use a Hakko genuine soldering tip? Do you use a Hakko genuine soldering tip? Use Hakko's genuine soldering tip.
Triger error	Has the desoldering tool reached the set temperature? Has the desoldering tool reached the set temperature? The tool is designed not to operate when the set temperature has not been reached, even if the trigger is pulled. Please use it only after it has reached the set temperature.
Zero-cross error	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.