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I have a mercury optimax 90hp and its giving me an alarm on…

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Hi I have a mercury...
Hi I have a mercury optimax 90hp and its giving me an alarm on the smart craft " system fault no9" when im on full throtle nothing happens but when i m low rev the alarm cames out. Any idea please?
Submitted: 11 months ago.Category: Boat
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Answered in 2 days by:
9/18/2017
Marine Mechanic: Charles, Marine Mechanic replied 11 months ago
Charles
Charles, Marine Mechanic
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Satisfied Customers: 4,894
Experience: US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
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Marine Mechanic: Charles, Marine Mechanic replied 11 months ago

The engine is going into guardian due to a sensor begin out of range. When this occurs, press the mode button on the gauge and see if it will tell you more data or show a second fault. If it does, that is the one that needs to be addressed to resolve the issue. I would suspect an overheat issue at low speeds is setting off the alarm, no matter how much or how cool the water from the tale-tell is.

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