Honda FOREMAN RUBICON TRX500FM6 2018 Owner's Manual page 36

Indicators & Displays
When the coolant is over specified temperature, the 5th segment (6)
appears and the high coolant temperature indicator (7) lights.
If this occurs, stop the engine and check the reserve tank coolant level.
Read pages 213 – 214 and do not ride the ATV until the problem has
been corrected.
NOTICE
Continuing to ride with an overheated engine can cause serious
engine damage.
(6) (7)
(6) 5th segment (7) high coolant
temperature indicator
If the "C – – – – – H" (8) blinks, the meter input signal fails. See your
dealer.
(8)
(8) "C – – – – – H"
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Instruments & Controls