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18 Troubleshooting
18.1 Remedying Lawn Mower Faults
18 Troubleshooting
Fault Cause Remedy
Engine cannot be
started.
Control bar for mowing is not pressed. ► Start engine as described in this instruction manual.
Fuel tank is empty. ► Refuel lawn mower.
Fuel line is blocked. ► Consult a STIHL specialist dealer.
Inferior, dirty or old fuel in the tank. ► Use fresh, good-quality unleaded petrol.
Air filter is dirty. ► Consult a STIHL specialist dealer.
Spark plug socket is detached from
spark plug or ignition lead is not
properly fastened to socket.
► Connect spark plug socket.
► Check connection between ignition lead and plug.
Spark plug is dirty, damaged or
electrode gap is incorrect.
► Clean or replace spark plug.
► Adjust electrode gap.
Resistance at the blade is too great. ► Set a higher cutting height.
► Start engine in lower grass.
Engine difficult to
start or engine
power
deteriorating.
Lawn mower housing is blocked. Clean lawn mower.
Cutting height is set too low or rate of
feed is too high.
Adapt cutting height or mow more slowly.
Water in fuel tank and carburettor or
carburettor is blocked.
Empty fuel tank, clean fuel line and carburettor.
Fuel tank is contaminated. Consult a STIHL specialist dealer.
Air filter is dirty. Consult a STIHL specialist dealer.
Spark plug is dirty. Clean or replace spark plug.
Engine
overheating.
Engine oil level is too low. Add or change engine oil as described in the engine instruction
manual.
Cooling ribs are dirty. Clean lawn mower.
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