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In this article, we explain error codes that are found in the Display ECU (the forklift’s screen) of Toyota electric forklifts in the 8FB10–8FB30 series.
If your forklift shows a flashing wrench, the UP LED is blinking, or the screen looks strange,
you may be seeing one of the F1–F8 series errors listed here.

This guide explains them.

①F1 Series – Display Communication Errors

These errors happen when the Display cannot communicate with the Main Controller.

F1-1 / F1-2
Cause:
Communication problem between the Main Controller and the Display.

What happens:
Some display functions do not work
Information may not show correctly

②F4 Series – Display CPU Errors

These errors mean there is a problem inside the Display’s CPU (the small computer inside the screen).

F4-1 / F4-2 / F4-3
What happens:
You cannot drive and lift at the same time
If your forklift uses a PIN code, authentication may fail

F4-4
Only an error message is shown

F4-5
Display becomes unstable

F4-6 / F4-7 / F4-8
Forklift controls (drive, lift, etc.) may act unstable

③F5 Series – Battery Temperature Sensor Errors

These errors happen when the battery temperature sensor or its wiring has a problem.
The forklift can still move, but battery protection functions will not work, so be careful.

F5-1 – Harness open (broken wire)
F5-2 – Harness short
F5-3 – Sensor open
F5-4 – Temperature abnormal

What happens:
・Battery protection does not work
・Battery data logging does not work correctly

④F6–F8 Series – Onboard Charger Errors
These errors are very common.
If the forklift cannot charge or charging stops in the middle, one of these errors is usually the reason.

F6 Series – Charging stops during charging
Main causes:
・Charger overheating
・Safety timer activated
・Charging voltage problem
・Charger malfunction

What happens:
・Charging stops

F7 Series – Charging start / voltage / current problems
Examples:
Charging cannot start
Charging voltage is too high
Charging current is abnormal
Current control problem

What happens:
・Charging stops
・Charging cannot begin

F8 Series – Charging completion / system errors
F8-1 – Charging does not finish
Charging should finish, but it does not.

F8-2 – Charging system abnormal
System problem → charging stops