1- Check electrical connections, fuses or size and length of power cable. Compare the pump motor rating, printed on a label on the side of the motor and on the serial number tag, to the power source, to be sure they agree in voltage, phase, and frequency.
2- The ambient temperature is too high
3- Cooling air supply is insufficient
4- Fan is not working or disconnected
5- The process gas is to hot or throughput is too high
6- Motor thermal protector open (tripped)
8- Motor is faulty
9- Pump bearing worn - Failure to replace pump's bearings at required intervals may lead to damage of the pumping mechanisms. tip seal replacement should be performed with bearing replacement. Contact Us for repair parts or service.If you cannot remedy your problem in-house, Contact Us for service.