If the run capacitors on the 230 volt motor are old and out of specification they can cause your motor to run hot. It might be worth disconnecting the capacitors and testing their capacitance with a multimeter that has a capacitance measuring capability. My experience is that these capacitors are good for about 10 years. Just one more thing to consider.
Gary S. Silver s/v Liahona Amel SM 2000 #335 Puerto Del Rey Marina, Puerto Rico
