Honda BF8, BF9.9 and BF10 Outboard Motors Shop Manual., Page 28Get this manual
From page 2-21Remove the foreign material then retest Stop the engine and check the water screen for clogging
Clogged
Not clogged
Restart the engine and allow it idleCheck that cooling water constantly flows through the water check hole
Does not flow-
Remove the foreign material then retestFlows constantly
Cool down the engine by idling the engine for few minutesThen check the indicator and buzzerL
Indicator OFF and buzzer stops