These errors refer to Channel 1 and Channel 2 and indicate a short with one or the other. The electric solenoid will need to be checked for a short.

Unplug the drive unit cable from the side cover. Using a voltage meter, measure the resistance (ohms) across the male pins on the end of the cable.
You should read 40-42 ohms across the outer pins and zero from each outer pin to the center pin.
Replace the solenoid if not able to receive readings and the connections are all secure.