[Elecraft] KPA 100 fan problem

[Bob G3PJT]

Hi

Yesterday I turned on and the fan came on even though the heatsink was 
cold and when I tried to TX 'PA hot' came on and the PA was inhibited.

1. CAL tpa is 220 which is about right  ~ 22C and Fan menu set  nor.
2. On  TX - Q3 base is 0.6v - which I think is about right (RC4 going 
high of course)
3. On U1 RC7 is 5 and RC6 is low which is the correct output for Fan Hi 
- which is what it is doing.
4. Power control less than 10w and the K2 sends OK
5. Firmware PA 1.06

Any ideas?

73 Bob G3PJT