Help.. Head overheated?

My service engine soon light came on today, I had autozone check the code and they said it was a head reaching an unsafe temperature. I didn't write down the code, but I checked the coolant it was fine, the thermostat/temp. gauge is worknig properly and the heater etc. works fine. The engine is running perfectly normal. Anyone with the same problem? Any help would be GREATLY appreciated. Thanks

AJ
 
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