Troubleshooting - Husqvarna ST 424 Operator's Manual

Problem
The product does not
start
876 - 003 -

Troubleshooting

Possible cause
The safety ignition key is not inserted.
The product is out of fuel.
The ON/OFF key is OFF.
The engine is not primed.
The engine is flooded.
The spark plug cable is not connected.
The spark plug is bad.
There is water in the fuel or the fuel is too
old.
There is vapor locked in the fuel line.
Other causes.
The fuel switch (if equipped) is in CLOSE
(OFF) position.
The throttle is in STOP position.
The starting battery is not charged.
The starting battery needs to be replaced.
The engine control unit does not receive
power.
The starter solenoid does not engage.
The fuel injector does not trigger. (For ST
424T/427T/430T only)
The fuel pump does not receive power. (For
ST 424T/427T/430T only)
Solution
Insert the safety ignition key.
Fill the fuel tank with fresh, clean
gasoline.
Move the ON/OFF key to ON posi-
tion.
Prime the engine.
Wait a few minutes before restart-
ing, DO NOT prime.
Restart the engine while full throt-
tle and the choke in OFF (CLOSE)
position.
Connect the cable to the spark
plug.
Replace the spark plug.
Empty the fuel tank and carburet-
or. Fill the fuel tank with fresh,
clean gasoline.
Make sure that all the fuel line is
below the outlet of the fuel tank.
The fuel line should run continu-
ously down from fuel tank to car-
buretor.
Inspect the starting procedures
carefully in this manual.
Turn the fuel switch to OPEN (ON)
position.
Move the throttle to FAST position.
Charge the starting battery.
Replace the starting battery.
Inspect the ECU fuse and wiring.
Inspect the starter fuse and wiring.
Contact an authorized service cen-
ter.
Contact an authorized service cen-
ter.
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