Kawasaki STX-15F - Manual (Page 109)

FUEL SYSTEM (DFI) 3-55
Engine Overheating (Service Code/Character-71/HEAt)
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If the service code is displayed, check the doubtful parts referring to the following table.
Possible Causes Action (Chapter)
Water passage clogged, loosened or damaged Inspect (see 9 chapter)
Incorrect engine oil level Inspect (see 4 chapter)
Engine oil poor quality or incorrect Change (see 4 chapter)
Water temperature sensor broken Inspect (see 3 and 14 chapters)
Jet pump or impeller damaged Inspect (see 11 chapter)
Oil cooler clogged Clean (see 4 chapter)
Carbon build-up on combustion chamber Clean (see 6 chapter)