[Elecraft] KPA 500 Fan Not Running

[paul ecker via Elecraft]

Having a KPA 500 fan problem I believe. Was running the amp during RTTY contest and experienced - a Hi Temp  hard fault. The case was very warm to the touch and the fan was not running. KPA Menu - Fan Ctl - is set to normal. So I let it cool down and then ran a test calling CQ a normal run rate (Amp putting out abt 200W) and watched temp climb and the fan does did not come on. When I shut the KPA off, the fan does not run. Does anyone know at what thresholds fan should start running ?  Is there some way to do a fan test?73 Paulkc2nyu