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You may not have applied enough pressure on the compression fitting to make it seal .Try tightening it more a little at a time and checking.You didn't say if the fitting is plastic or metal

Does it have a belt? Is the belt wet?Will the pump pulley turn?

You could also have a transmission problem

This is normal

Has the turn off bar accidentally been turned off?If so drop back down and wait.Is the tray turning over but not dumping ?If so empty manually and spray with Pam until you can replace the tray.(hard...

Check for a kinked or stopped up drain hose or drain line

I also have an f4 code which then changed to an f3 code The catalyst won't start agitation.I unpluged the machine for two min. to reset but to no avail