Troubleshooting; Troubleshooting Of The Product - Husqvarna 520iHT4 Workshop Manual

7.1 Troubleshooting of the product

Symptom
The product does not start. No LEDs
come on when you push the on/off
button.
The product does not start and the
batteries that are put in the product
are immediately damaged.
The motor does not start when you
push the power trigger.
The motor makes sudden movement
when you push the power trigger,
then stops.
The product stops when you apply
work load.
The keypad LEDs flash.
The motor speed changes.
The warning symbol on the keypad
flashes continuously.

32 - Troubleshooting

7 Troubleshooting
Possible causes
The battery is defective.
The connector between the battery
and the product are defective.
The cables between the control unit
and the keypad or the main switch
are damaged.
Short circuit in the control unit.
Short circuit in the control unit.
Defective connection in the main
switch signal connector.
The motor cables are connected in-
correctly.
The main switch is damaged.
Short circuit in the keypad.
Short circuit in the control unit.
Defective connection in the keypad
connector.
Defective connection in the keypad
connector.
Short circuit in the keypad.
Defective connection in the main
switch signal connector.
Damaged or worn main switch.
The temperature is too high.
The temperature of the control unit or
the battery is too low.
Water in the main switch signal con-
nector
Short circuit in keypad.
Short circuit in main switch.
The control unit is defective.
Recommended step
Push the on/off button to do a check
of the battery. A minimum of 1 green
LED must come on.
Make sure that the power connectors
between the battery and the product
are not dirty or damaged.
Repair or replace the cables if you
can see damages.
Replace the control unit.
Replace the control unit.
Make sure that the keypad connector
is correctly assembled, dry, not dam-
aged and that there is no corrosion.
Make sure that the motor connectors
are correctly connected.
Replace the main switch.
Replace the keypad.
Replace the control unit.
Make sure that the connectors be-
tween battery and product are clean
and not damaged.
Make sure that the keypad connector
is correctly assembled, dry, not dam-
aged and that there is no corrosion.
Replace the keypad.
Make sure that the keypad connector
is correctly assembled, dry, not dam-
aged and that there is no corrosion.
Replace the keypad.
Wait for the product to become cool
(max. 5 min.).
Make sure that the product and the
battery are not colder than -10° C.
Disassemble and dry the main switch
signal connector and then assemble
it.
Replace the keypad.
Replace the main switch.
Replace the control unit.
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