Troubleshooting - ST F 72 FL Manuel D'utilisation

7. TROUBLESHOOTING

PROBLEM
1. W ith the key on «ON», the light
stays off
2. W ith the ignition key turned to
«START» the light flashes and
the starter motor does not run
3. W ith the key on «START» the
light comes on but the starter
motor does not run
4. W ith the ignition key turned to
«START» the starter motor runs
but the engine does not start
5. S tarting is difficult or the engine
runs erratically
6. W eak engine performance
during cutting
7. T he engine stops while working
and the lamp flashes
8. T he engine stops and the light
goes off
9. T he engine stops but the light
stays on
10. T he cutting means do not
engage or do not stop promptly
when they are disengaged
LIKELY CAUSE
The safety device of the electronic
circuit board has cut in due to:
– badly connected battery
– battery terminals crossed
– badly earthed
– flat battery
– blown fuse
– wet circuit board
– s tarting conditions have not
been met
– i nsufficiently charged battery
– b attery charger fuse blown
– m alfunction on the starter relay
– i nsufficiently charged battery
– f aulty fuel supply
– f aulty ignition
– f aulty carburetion
– f orward speed too high in relation
to cutting height
The safety device of the electronic
circuit board has cut in due to:
– t he safety devices have cut in
The safety device of the electronic
circuit board has cut in due to:
– fl at battery
– o vervoltage caused by the
charge regulator
– b adly connected battery
(poor contact)
– p roblems in the engine
– p roblems with the engagement
mechanism
17
SOLUTION
Turn the ignition key to the «STOP»
position and look for the cause of
the problem:
– c heck connections (see 3.2)
– c heck connections (see 3.2)
– c heck connections (see 3.2)
– r echarge the battery (see 6.3.3)
– r eplace the fuse (10 A) (see 6.4.4)
– dry using luke warm air
– c heck that all starting conditions
are met (see 5.2.a)
– r echarge the battery (see 6.3.3)
– r eplace the fuse (25 A)
(see 6.4.4)
– c ontact your Dealer
– r echarge the battery (see 6.3.3)
– c heck the level in the tank
(see 5.3.3)
– o pen the fuel stopcock (if fitted)
(see 5.4.1)
– c heck the fuel filter
– c heck that spark plug cap is
securely fitted
– c heck that the electrodes are
clean and have the correct gap
between them
– c lean or replace the air filter
– fl ush out the float chamber
– e mpty the fuel tank and refill with
fresh fuel
– c heck and replace the fuel filter if
necessary
– r educe the forward speed and/or
raise the cutting height
(see 5.4.5)
Turn the ignition key to «STOP»
and look for the cause of the
problem:
– c heck that all starting conditions
are met (see 5.2.b)
Turn the ignition key to «STOP»
and look for the cause of the
problem:
– r echarge the battery (see 6.3.3)
– c ontact a Licensed Service
Centre
– c heck battery connections
(see 3.2)
– c ontact a Licensed Service
Centre
– c ontact your Dealer