Join Date: May 2004
Location: Morganville, NJ
Thanked 19 Times in 16 Posts
There is no control module, only the main relay.
He needs to know if the wiring or relay contacts to the pump is able to handle the amperage draw of the pump itself, if it isn't, the pump will run too slowly from under voltage and overheat. These pumps don't like to run on low voltage.
What does the inside of the tank look like? Has the guy been replacing the "sock" pickup filter when he changes the pump?
He should also be checking the wiring that goes into the tank unit, to ensure nothing is burned or corroded causing voltage drop.
Skidmarcx made a good point, what is operating pressure on this system? If it's too low, it could point to a bad regulator, low voltage to the pump or restricted filter. If however it's got excessive pressure, either the regulator is bad, the return line(s) are collapsed. The excessive pressure is like "dead heading" the pump, which will also kill it.
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