Pool and Spa
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Were any of the wires that were damaged connected in any way to the circuit board on the outside unit? If so it is possible the circuit board could have been ruined. Does it have a fuse on it? Also your voltage from inside to outside should be 24volts if i am not mistaken. Also you should have a draft inducer fan on the outside unit, That is what satisfies the pressure switch. My thinking is since it works in manual mode and not automatic that manual may be bypassing the control board in the outside unit. See if you have voltage to the board on the outside. Put it in automatic and go outside and see at what stage in the cycle of operation that it quits.
Please let me know if i have helped, Or if you need further help. I would like to know if you found the problem. Thank's Barry.