An error code appears on the display of the FX-805

If the buzzer sounds and an alphabetic error code is shown on the display while using an FX-805, 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	Is the soldering iron plug about to be disconnected from the unit(station)? Is the soldering iron plug about to be disconnected from the unit(station)? Connect the iron plug to the unit (station) firmly. Is an incompatible soldering iron other than FX-8004 and FX-8005 connected? Is an incompatible soldering iron other than FX-8004 and FX-8005 connected? After confirming the iron is correct, connect the iron plug to the unit (station) firmly.
Tip error	Is a wrong tip other than the T37 (400W) or T33 (300W) series, which is applicable for the FX-805, attached to the soldering iron? Is a wrong tip other than the T37 (400W) or T33 (300W) series, which is applicable for the FX-805, attached to the soldering iron? If so, replace it with the one from the T37 or T33 series.
Sensor error	Is the soldering tip inserted into the iron properly until it stops at the end? Is the soldering tip inserted into the iron properly until it stops at the end? Insert the soldering tip firmly until it stops at the end. The iron holder FH-220 allows easy and safe tip replacement (attach, detach). Click here for more information. How to replace a tip safely using the iron holder
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 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.
Abnormal heat error	Heating function is abnormal. Heating function is abnormal. Turn off the power switch. Wait for the tip to cool down. Then, turn it back on. If the problem persists, replace the tip.
Zero-cross error	Are there any strong noise sources in the working area with the unit? Are there any strong noise sources in the working area with the unit? Use the unit away from the possible noise source.