[Elecraft] KPA500 fan won't shut off

[VK5GR]

FAN CTL = NOR

FANs are idle while the amp is turned on - amp ambient temp was 27C at the
time (it was powered up and had been idle for about 20 minutes).

I then turned the amplifier off via the front panel push button. I would
have expected the FANs to start up for about 10 seconds as they discharge
the 60V rail supply but instead the FANs continue to run. the only way to
turn them off is to unplug the amp from the mains supply.

It is definitely a fault condition and not a menu selection.

Thoughts?



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