Trane RTWA 70-125 TON - Manual (Page 33)

RLC-SVD03A-EN 33
Under-Over Voltage Transformer
replacing the CPM, double check the Under-Over Voltage Function's
Nominal Line Voltage Setup in the Service Settings Group.
5. If the Under-Over Voltage Protection function continues to misoperate,
and all of the above measured ratios are within tolerance, and all CLD
Under Over Voltage setups have been verified, replace the CPM. It is a
good idea, before replacing the CPM, however, to copy down all of setup
data. This data will be very helpful in making the necessary setup on the
replacement CPM.