Y axis not homing properly BB

Turned on the BB machine & told it to home, Z homed, then X homed but Y gantry stopped about 4 inches from normal home and signaled Y0 under. Joy stick would not take it past the fake Y0, restarted machine and same thing. restarted and gantry moved to about 1 inch away from normal Y0, re started and no movement. turned off machine & manually moved the gantry to its proper 0 position homed the machine & it set at Y0 as it should. Any tips?

Look up the faq for stall homing using the search bar

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