Hi all. Could anyone on here help me with a problem with my mill. I have a Bridgeport 720X VMC with a Heidenhain 2500 control. It recently started having an issue where the axis wouldn't release to zero return after the power was turned on. This was intermittent and after a few days it seemed to sort itself out.
However since this happened I have been unable to start the spindle in M03. If you start a program it gets to the line with M03 in and then waits for the spindle to start (which it doesn't) before continuing. The relay CR15 lights in the box so I guess the main PLC board is working. If you use M04 (anti-clockwise) to start the spindle it starts straight away and continues with the program. The correct relay CR16 lights when this happens.
Could anyone help with this problem or get me in the right direction? I don't know if the two issues are connected (though the first issue seems to have cleared itself.) No error codes are shown on the spindle drive board.

Thanks in advance

Andy.