According to the manual, it’s an error with the KBPF3 bandpass filter board installed on the Main RF Board. It indicates you should uninstall the KBPF3 from the RF board.
You could try removing it and plugging it back in a couple of times. It could just be corrosion on the contacts. If that doesn’t solve the problem, I’d get in touch with Elecraft support.
Grant NQ5T
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