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This article summarized the Toyota electric forklift F-series error codes.
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Code	Memory	Display Method	Detected ECU	Error Mode	Vehicle Symptoms
F1-1	F1-1	Spanner Flashing	Display	Main Controller → Display Communication Error	Partial display functions disabled
F1-2	F1-2	Spanner Flashing	Display	Main Controller → Display Communication Error	Partial display functions disabled
F4-1	F4-1	Spanner Flashing	Display	Display CPU Error	Driving & load handling cannot be operated simultaneously / PIN code entry unavailable (if equipped)
F4-2	F4-2	Spanner Flashing	Display	Display CPU Error	Driving & load handling cannot be operated simultaneously / PIN code entry unavailable (if equipped)
F4-3	F4-3	Spanner Flashing	Display	Display CPU Error	Driving & load handling cannot be operated simultaneously / PIN code entry unavailable (if equipped)
F4-4	F4-4	Spanner Flashing	Display	Display CPU Error	Error display only
F4-5	F4-5	Spanner Flashing	Display	Display CPU Error	Display functions unstable
F4-6	F4-6	Spanner Flashing	Display	Display CPU Error	Various control operations unstable
F4-7	F4-7	Spanner Flashing	Display	Display CPU Error	Various control operations unstable
F4-8	F4-8	Spanner Flashing	Display	Display CPU Error	Various control operations unstable
F5-1	F5-1	Spanner Flashing	Display	Battery Temperature Sensor Harness (Vehicle-side) Open	Battery protection disabled / Partial battery data logging disabled
F5-2	F5-2	Spanner Flashing	Display	Battery Temperature Sensor Harness (Vehicle-side) Short	Battery protection disabled / Partial battery data logging disabled
F5-3	F5-3	Spanner Flashing	Display	Battery Temperature Sensor Open	Battery protection disabled / Partial battery data logging disabled
F5-4	F5-4	Spanner Flashing	Display	Battery Temperature Sensor Temperature Abnormality	Battery protection disabled / Partial battery data logging disabled
F6-1	F6-1	UP LED Flashing / Spanner Flashing	Display	On-board Charger Charging Error (Total Timer Activated) (1–2 ton models)	Charging stopped
F6-1	F6-1	UP LED Flashing / Spanner Flashing	Display	On-board Charger Charging Error (Safety Timer Activated) (3 ton models)	Charging stopped
F6-2	F6-2	UP LED Flashing / Spanner Flashing	Display	On-board Charger Transformer Overheat (1–2 ton models)	Charging stopped
F6-3	F6-3	UP LED Flashing / Spanner Flashing	Display	On-board Charger Transformer Overheat (3 ton models)	Charging stopped
F6-4	F6-4	UP LED Flashing / Spanner Flashing	Display	On-board Charger Charging Not Possible	Charging stopped
F6-6	F6-6	UP LED Flashing / Spanner Flashing	Display	On-board Charger Charging Voltage Abnormality	Charging stopped
F7-1	F7-1	UP LED Flashing / Spanner Flashing	Display	On-board Charger Charge Start Error (1–2 ton models)	Charging stopped
F7-1	F7-1	UP LED Flashing / Spanner Flashing	Display	On-board Charger Charge Start Error (Unable to Start Charging) (3 ton models)	Cannot charge
F7-2	F7-2	UP LED Flashing / Spanner Flashing	Display	On-board Charger Overvoltage	Charging stopped
F7-3	F7-3	UP LED Flashing / Spanner Flashing	Display	On-board Charger Overcurrent Error	Charging stopped
F7-4	F7-4	UP LED Flashing / Spanner Flashing	Display	On-board Charger Charging Current Control Error	Charging stopped
F7-5	F7-5	UP LED Flashing / Spanner Flashing	Display	On-board Charger Magnet Error	Charging stopped
F8-1	F8-1	UP LED Flashing / Spanner Flashing	Display	On-board Charger Charge Completion Error (Unable to Complete Charging)	Charging does not finish
F8-2	F8-2	UP LED Flashing / Spanner Flashing	Display	On-board Charger Charging System Abnormality	Charging stopped