Make sure the Hot/Cold Mixer Trench Mark (6) should be set in the middle position. Turn on water and slowly turn the faucet knob all the way to Hot then Cold to identify which solenoid has problem.
Check connection of Solenoid (14) If the connection is OK. Go to step 3 to replace the solenoid. See Solenoid Fig below to locate the Solenoid wire connection (5)
IDENTIFYING THE DEFECTED SOLENOID: There are 2 Hot and Cold solenoids. Turn Mixer Valve all the way to the left then right to find out which solenoid is defected. Make sure you replace the right one.
See Video Below on How To Replace Solenoid