Water Temperature "Failure Indicator"

[Prof Beard]

This morning my 996 C4S Tip started normally then a mile or so up the road I got "Failure Indicator" and a picture of a thermometer on the computer, a slow flashing red light on the temperature gauge and a zero temperature indication on the gauge. All levels were normal and the coolant in the header tank was hot/warm when I checked it after a while. The car is (via AA ) off to the local specialists on a truck in a bit.

Ideas, thoughts?

Edited by Prof Beard on Monday 12th November 14:40

[Magic919]

Sender unit failing. My oil pressure sender did same thing.

[cd1957]

Hi the last one of this fault turned out to be the thermostat had stuck open,the dme has a built in warm up map,if the temp deviates outside of this map it turns the temp gauge of and issues the warning.

[Prof Beard]

Thanks - from trawling around on the forums, there seem to be a number of causes of this - hopefully I'll know which mine is soon once the garage report back

[tonygt3]

FWIW it was a sticking thermostat on my gearbox heat exchanger that was my problem. It stuck open so failed safe.