Section 5 Troubleshooting; Introduction; Controller Troubleshooting; Generator Set Troubleshooting - Kohler 18RESL Operation Manual

5.1 Introduction

Use the following charts to diagnose and correct
common problems. First check for simple causes such
as a dead engine starting battery, loose connections, or
an open circuit breaker. The charts include a list of
common problems, possible causes of the problem, and
recommended corrective actions.
If the procedures in this manual do not explain how to
correct the problem, contact an authorized distributor/
dealer. Maintain a record of repairs and adjustments
performed on the equipment. Use the record to help
describe the problem and repairs or adjustments made
to the equipment.
Problem Possible Cause
Controller LED
No power to the controller:
display is off
The generator set has not run for 48 hours
or longer and the controller has powered
down.
Controller fuse (F3) is blown.
Low or no battery voltage.
Generator set master switch is in the
OFF/RESET position.
Generator set master switch in AUTO but no
start command has been received since last
controller reset.
Figure 5-1 Controller Troubleshooting Chart
TP-6517 1/11

Section 5 Troubleshooting

5.2 Controller Troubleshooting

Figure 5-1 contains troubleshooting, diagnostic, and
repair information for the DC-RET controller.

5.3 Generator Set Troubleshooting

Figure 5-2 contains generator set troubleshooting,
diagnostic, and repair information. Check for loose
connections before replacing parts.
Fault Codes
The controller displays fault codes to aid in
troubleshooting. Fault codes, descriptions, and
recommended actions are listed in Section 2.6. If a fault
code is displayed, identify and correct the cause of the
fault condition. Then reset the controller. See Section
2.6.3.
Corrective Action
Controller display will automatically activate when a
remote start command is received or the generator set
master switch is moved to the RUN position. See
Section 2.3.
Replace the fuse. If the fuse blows again, contact the
distributor/dealer.
Check connections.
Check generator set battery and battery charger. See
Figure 5-2.
Move generator set master switch to the AUTO or RUN
position. In AUTO, the display will not turn on until the
first start command is received.
Controller display will activate when a remote start
command is received or the generator set master switch
is moved to the RUN position. Use the remote switch to
start generator set and activate the controller display, if
desired. See Section 2.2.2.
Section 5 Troubleshooting 39