Troubleshooting
5| Symptom | Cause | Remedy |
|---|---|---|
| MPAC(cid:2) 1500 AC voltage sensing is incorrect. | NO - The controller system voltage does not match the actual system voltage. YES - The ATS rating is correct for the application but line voltage was not found at all points. - Poor connection at P1 connector or damaged leads or harness. - Line voltage was not found directly on circuit board. | NO - Check and reprogram the controller’s system voltage setting to the correct system voltage. YES - Trace leads back to the contactor and sensing terminals, repair or replace damaged leads or harness. - Verify power directly on circuit board where P1-12, P1-11, and P1-4 (Normal) and P1-7, P1-6, and P1-18 (Emergency) are soldered to the board. |
| MPAC(cid:2) 1500 controller display is blank. | NO - No LEDs on the controller are illuminated. YES - Line voltage was not found at all points or poor pin connection or broken wire at P1, damaged ribbon cable. | NO - Trace leads back to the contactor and sensing terminals, repair or replace damaged leads or harness. YES - Inspect the ribbon cable, correct incorrect connections, replace display assembly if necessary. |
| Transfer Troubleshooting, Part 1 | Rewind operation to normal state (0051CAPM), check for fitment issues. | |
| Transfer Troubleshooting, Part 2 | Check for fitment issues, perform rewinding operation if necessary. | |
| Display Errors or Controller Lockup | Check main logic board (MLB) and power supply board. Ensure proper connections at P1/J1. |
Symptom → cause → remedy extracted from this unit’s service/owner documentation; verify against the official manual before servicing.
About
Kohler Model K1 Automatic Transfer Switches — transfer switch. Specifications and parts compiled from manufacturer documents.