Code E115 - Contactor Off, Welded or Missing, or Faulty Power Amp
Reason: Controller could not close contactor (contactor OFF),contactor welded, or contactor missing.
Possible Cause with Corrective Actions/Checks:
Contactor did not close (contactor OFF).
1. Problem with main contactor tips.
a. If contactor clicks prior to getting this code, try polishing the
contactor tips with a clean pencil eraser. If this does not work or
there is permanent contactor damage, replace the contactor.
2. Low voltage.
a. Try closing the contactor with a good battery.
3. Short in the contactor coil.
a. Replace the contactor
Contactor welded.
1. Main contactor tips welded.
2. Short circuit in contactor circuit.
a. Check the contactor wiring (coil) and cabling.
Contactor missing.
1. Open circuit in the contactor circuit.
a. Check the contactor wiring (coil) and cabling.
2. Faulty power amplifier.
a. Check the power amplifier for error code.
b. Check the power wiring.

Did you check battery short to frame? I think up to 3 volts is acceptable. Anything beyond that, the battery need to come out and everything cleaned. Does the contactor close when you power up the machine?

I have check the voltage thur out the machine. All is 24v right up into the harness running up the handle. But non of the controls when activated in the handle produce any voltage back down the harness out of the handle to the solenoid or horn.

E115 is a Main Contactor Fault. Contactor tips could be welded together, or contactor could be bad. Check wiring and voltage at contactor. If wiring and voltage are ok. Replace contactor. Hope this gets you going.