What to do if Kohler 55EFOZ Marine Equipment controller circuit board(s) inoperative?
- DDaniel JohnsonSep 23, 2025
If the controller circuit board is inoperative, replace the controller circuit board.

What to do if Kohler 55EFOZ Marine Equipment controller circuit board(s) inoperative?
If the controller circuit board is inoperative, replace the controller circuit board.
What to do if Kohler Marine Equipment fuel tank is empty?
If the fuel tank is empty or the fuel valve is shut off, add fuel and move the fuel valve to the ON position.
What to do if Kohler 55EFOZ controller fuse blown?
If the controller fuse is blown, replace it. If the fuse blows again, troubleshoot the controller.
What to do if Kohler 55EFOZ oil level low?
If the oil level is low, restore it and inspect the generator set for oil leaks.
What to do if AC output circuit breaker open in Kohler 55EFOZ?
If the AC output circuit breaker is open, reset the breaker and check for AC voltage at the generator side of the circuit breaker.
What to do if Kohler Marine Equipment thermostat inoperative?
If the thermostat is inoperative, replace the thermostat.
What to do if Kohler 55EFOZ controller master or start/stop switch inoperative?
If the controller master or start/stop switch is inoperative, replace it.
What to do if Kohler 55EFOZ Marine Equipment cooling water pump inoperative?
If the cooling water pump is inoperative, replace the water pump.
What to do if Kohler 55EFOZ Marine Equipment has exhaust system leak?
If there is an exhaust system leak, inspect the exhaust system and tighten the loose exhaust system components.
How to reset fault switches on Kohler 55EFOZ Marine Equipment?
If there is a fault shutdown, reset the fault switches and troubleshoot the controller.
| Brand | Kohler |
|---|---|
| Model | 55EFOZ |
| Category | Marine Equipment |
| Language | English |
Overview of specification sheets for generator and engine information.
Details the alternator, PMG excitation system, and voltage regulator.
Illustrates and labels key components of the generator set.
Explains the function of a remote annunciator for monitoring generator set status.
Describes the safeguard breaker's role in sensing output current and protecting the AC voltage regulator.
Details the line circuit breaker's function in interrupting generator output during overloads.
Explains the run relay kit's contacts for controlling auxiliary devices during operation.
Lists essential checks and inspections to perform before or at each generator set startup.
Recommends vessel inspections, especially the exhaust system, by authorized personnel.
Shows angular operation limits for units covered in the manual.
Notes specific regulations for operation within EU countries regarding noise emissions.
Provides instructions for operating the generator set under load weekly for an hour.
Details operation for the Decision-Maker 3+ controller, including prime power mode.
Describes the controls and indicators found on the Decision-Maker 3+ controller.
Explains the fuses and terminal strips on the Decision-Maker 3+ controller circuit board.
Defines possible auxiliary fault lamp conditions and their meanings.
Outlines local and automatic starting procedures for the generator set.
Provides procedures for normal and emergency stopping of the generator set.
Explains how to enable and use the prime power mode for reduced battery drain.
Lists fault conditions that automatically shut down the generator set.
Details the procedure to restart the generator set after a fault shutdown.
Provides steps to restart the generator set after an emergency stop shutdown.
Covers operation for the Expanded Decision-Maker 1 controller, including controls and indicators.
Describes the controls and indicators on the Expanded Decision-Maker 1 controller.
Explains starting procedures for the Expanded Decision-Maker 1 controller.
Details how to stop the generator set using the Expanded Decision-Maker 1 controller.
Lists fault conditions that cause shutdown for the Expanded Decision-Maker 1 controller.
Outlines the procedure to restart after a fault shutdown with the Expanded Decision-Maker 1 controller.
Covers operation for the Standard Decision-Maker 1 controller, including controls and indicators.
Describes the controls and indicators on the Standard Decision-Maker 1 controller.
Explains starting procedures for the Standard Decision-Maker 1 controller.
Details how to stop the generator set using the Standard Decision-Maker 1 controller.
Lists fault conditions that cause shutdown for the Standard Decision-Maker 1 controller.
Outlines the procedure to restart after a fault shutdown with the Standard Decision-Maker 1 controller.
Covers general safety precautions and practices for maintaining the generator set.
Provides a schedule for routine maintenance tasks based on operating hours or time intervals.
Details maintenance procedures for the generator set's cooling system.
Describes how to inspect the siphon break to prevent seawater entry.
Explains how to inspect and replace the seawater pump impeller.
Outlines inspection points for the exhaust system, including leak checks.
Lists specific components of the exhaust system to inspect for cracks, leaks, and corrosion.
Provides steps for preparing the generator set for storage lasting three months or longer.
Details how to prepare the engine lubricating system for storage.
Outlines steps for preparing the cooling system for storage.
Provides instructions for preparing the fuel system for storage.
Describes how to prepare the exterior of the generator set for storage.
Explains how to store the generator set battery properly.