Coolant overheating warning light

[Fazerider]

I knew it was there but even when I was purposely trying to get the fan on when changing the coolant and doing a rad flush the fan or the light never came on, I got bored waiting and gave up after about 10-15 mins of ticking over. 

Only the green ignition light comes on  -- 98

I never got mine hot enough to turn on the fan except once on a stupidly hot day when I got totally stuck in traffic. Last time I changed the radiator I decided to ditch the fan as it gets in the way... the bike's done 30k since then.