Troubleshooting guide – Losi LOSB0112 User Manual
Page 8

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8
EN
Many	questions	are	the	result	of	simple	user	errors	or	minor	adjustments	which	
are	easily	addressed.	If	after	reading	below	you	cannot	resolve	your	problem,	
contact the appropriate Horizon product support center. 
Steering servo operates but the motor does not run
 				•		Reprogram	the	ESC	by	following	the	programming	instructions.	
					•		Confirm	the	servo	is	properly	connected	to	the	throttle	channel	on	the	
receiver.
					•		Damaged	motor:	Test	motor	independently,	repair	or	replace	as	needed.	
					•		Vehicle	battery	voltage	is	low:	Charge	as	needed.	
					•		ESC	overload	protection	is	enabled:	Check	motor	and	connections.	
					•		Transmission	is	damaged:	Check	transmission	gears,	spur	gear	and	pinion	
gear for damage.
Steering and motor do not function
					•		Servo	and	ESC	are	not	properly	connected	to	the	receiver:	Check	polarity	of	
the connectors to the receiver.
• Transmitter batteries or vehicle battery pack discharged: Recharge or
replace as needed.
Full speed not attainable
					•		ESC	programmed	incorrectly:	Reprogram	the	ESC.	
					•		Check	battery	connectors	for	damage.
					•		Vehicle	battery	is	weak:	Recharge	vehicle	battery.
Vehicle will not reverse
					•		Confirm	the	throttle	trim	is	at	neutral.	
					•		Confirm	the	ESC	is	not	in	Forward	Only	mode.
					•		ESC	is	not	calibrated	correctly:	Reprogram	the	ESC.
Spur gear is damaged repeatedly
					•		Improper	gear	mesh.
 •		Slipper	clutch	is	not	adjusted	correctly.
Motor operates backward
 				•		Motor	is	incorrectly	connected	to	the	ESC.	Confirm	the	black	wire	on	the	
motor is connected to the black wire on the ESC.
Motor starts running as soon as the battery is connected
 			•		Always	power	on	the	transmitter	before	powering	on	the	vehicle.
					•		ESC	is	damaged	and	needs	to	be	replaced.
Motor slows but will not stop
					•		Throttle	trim	is	adjusted	incorrectly.	
					•		ESC	program	does	not	match	transmitter:	Reprogram	the	ESC.
Reduced radio range
 •		Motor	capacitors	broken/missing:	Repair	or	replace.	
					•		Electrical	noise	from	the	motor:	Move	the	receiver	away	from	ESC,	motor	
and wiring.
• Transmitter batteries are weak: Replace AA batteries.
Transmitter does not power on. 
 •		Confirm	the	AA	batteries	are	installed	correctly.
					•		Replace	AA	batteries	in	the	transmitter.
Troubleshooting Guide
