Husqvarna EZ4624 Operator's Manual page 62

The engine seems weak.
The engine overheats.
Battery not charging.
The machine moves slowly, unevenly, or not at all.
Mower deck not engaging.
Transaxle leaks oil.
62
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English
TROUBLE SHOOTING GUIDE
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Clogged air filter.
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Defective spark plugs.
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Carburetor incorrectly adjusted.
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Air trapped in hydraulic system.
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Clogged air intake or cooling fins.
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Engine overloaded.
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Poor ventilation around engine.
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Defective engine speed regulator.
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Soot in the combustion chamber.
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Too little or no oil in the engine.
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Defective spark plugs.
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Pre-ignition incorrect.
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Air trapped in hydraulic system.
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Poor contact with battery terminal cable
connectors.
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Parking brake on.
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Bypass valve on pump open.
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Drive belt for the transmission gears slack or has
come off.
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Air trapped in hydraulic system.
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Drive belt for the mower deck has come loose.
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Contact for the electromagnetic coupling has
loosened.
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The blade switch is faulty or has come loose,
from the cable contact.
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The fuse has blown.
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Damaged seals, housing, or gaskets.
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Air trapped in hydraulic system.