Troubleshooting Guide - Husqvarna 968999657 Operator's Manual

Problem
The engine will not start.
The starter does not turn the engine over.
The engine runs rough.
The engine seems weak.
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TROUBLESHOOTING GUIDE

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Cause
The blade switch is engaged.
Steering controls are not locked in the neutral position.
The driver is not sitting in the driver's seat.
The parking brake is not activated.
The battery is dead.
Contamination in the carburetor or fuel line.
The fuel supply is closed or the shut-off valve for the fuel
tank is in the wrong position.
Clogged fuel filter or fuel line.
Dead battery.
Poor contacts on the battery terminal cable connections.
Fuse blown.
Ignition system faulty.
Fault in the starter safety circuit. See Checking the Safety
System in the "Maintenance Section"
Faulty carburetor.
The choke control is pulled out with a warm engine.
Defective valves.
The cylinder head bolts are loose.
Clogged fuel filter or jet.
Clogged ventilation valve on the fuel cap.
Fuel tank nearly empty.
Fouled spark plugs.
The spark plugs are loose.
Defective spark plug electrode.
Defective spark plug connection.
Rich fuel mixture or fuel-air mixture.
Wrong fuel type.
Water in the fuel.
Clogged air filter.
Air trapped in hydraulic system.
Clogged air filter.
Fouled spark plugs.
Carburetor incorrectly adjusted.
Air trapped in hydraulic system.