Standard and Deluxe boxes are for 1 hp - 15 hp single-phase water systems that use standard/heavy-duty pressure switches, level switches or other pilot devices. Deluxe boxes contain magnetic line contactors carefully matched to the motor rating, eliminating the need for external line contactors. The 15 hp XL Deluxe box has a larger enclosure that provides the space you need for heavy-duty wire and plenty of room for add-ons.

I have outlined some troubleshooting steps below to help investigate problems with your Control Box.

Caution! Electricity can be very dangerous, especially if you are inexperienced. Always use caution working with electricity and turn off power supply breakers when testing components within the electrical system. If you are not 100% confident you can perform any of these tests safely, call a professional.

1. Measure Voltage at Pressure Switch. Ensure that the motor is off and measure voltage at L1 and L2 of pressure switch. The reading should be +/- 10% of motor rating. With the motor running, measure voltage at the load side of pressure switch. The voltage reading should remain the same except for a slight dip on starting. Excessive voltage drop can be caused by loose connections, bad contacts, ground faults, or inadequate power supply. Relay chatter is caused by low voltage or ground faults.
2. Measure Voltage at Control Panel. Measure voltage at L1 and L2 in the Control Panel. The reading should be +/- 10% of motor rating.
3. Check Overloads. Set Ohmmeter to lowest ohm setting and test each of the overloads by touching the solder points inside the box. You are looking for a reading less than 0.5 A zero reading will indicate that the overloads are tripped. Reset the overloads and retest.
4. Check Run & Start Capacitors. Carefully remove the Capacitors from the Control Box. Using ohmmeter again at lowest setting, attach the leads to the terminals. The reading on the ohmeter will fall and then immediately climb towards 1 if the capacitor is good.
5. Potential (Voltage) Relay Coil Test. Remove Relay from Control Box. Set ohmmeter to R X 1,000 and attach the leads to connections #2 & #5. A correct meter reading for a good coil is between 4.5 and 7.0.
6. Potential (Voltage) Relay Contact Test. Set ohmmeter to R X 1 and attach leads to connections #1 & #2. A correct reading for a good contact is Zero ohms.
7. Line Contactor Coil Test. Remove Line Contactor from Control Box. Set ohmmeter to R X 100 and attach leads to contactor coil terminals. A correct meter reading for a good coil is between 1.8 and 14.0.
8. Line Contactor Test. Set ohmmeter to R X 1 and attach leads to L1 & T1 or L2 & T2. Manually close contacts. A correct meter reading should be Zero ohms.

Hopefully this blog has given you some insight or a solution to your problem. You can also check out our video titled “How to Troubleshoot Franklin Electric Control Boxes (1.5 - 15 HP)” on the RC Worst YouTube Channel or give our experts a call at 855.329.4519.

To review these instructions in the Franklin AIM Manual Click HERE