Troubleshooting (Diagnostics) - MQ Power WHISPERWATT DCA25SSIU4FC8 Operation Manual

ENGINE FAULT DIAGNOSTICS
The engine controller of this generator diagnoses problems
(faults/errors) that arise from the engine control system and
the engine itself.
When an engine fault occurs during operation, the Warning
(Diagnostic) lamp located on the control panel will turn
ON. When this occurs, immediately perform the following
engine fault code diagnostic procedure.
Engine Fault Code Diagnostic Procedure
1. Remove all loads from the generator and place all
circuit breakers in the OFF position.
2. Stop the engine.
3. Release the retaining screws that secure the control
panel to the generator frame.
4. Slowly let the control panel fall forward so that the inside
of the control box is exposed.
5. To start the diagnostic process, place the Diagnostic
switch in the ON (Figure 82) position.
DIAGNOSTIC
BUTTON
DIAGNOSTIC
LAMP
Figure 82. Diagnostic Panel
NOTICE
Make sure to place the Diagnostic switch back to the
OFF position after completing the engine fault code
diagnostic procedure.
6. Verify that the Diagnostic lamp (Figure 82) is ON. This
indicates that there is a fault/error in the engine or the
engine control system.
DCA25SSIU4FC8 60 HZ GENERATOR • OPERATION MANUAL — REV. #0 (08/23/22) — PAGE 49

TROUBLESHOOTING (DIAGNOSTICS)

DIAGNOSTIC SWITCH
(ON POSITION)
NOTICE
If the Diagnostic switch is turned to the ON position
under normal operating conditions (no fault/error),
the Diagnostic lamp will only light for 3 seconds, then
turn off.
7. Press and hold the Diagnostic button (Figure 82) to
identify the fault and verify the following:
• The Diagnostic lamp (Figure 82) will flash a pattern
corresponding to the detected fault code 3 times at
2.4-second intervals.
• If more than two fault codes are detected, the
Diagnostic lamp will continuously repeat the detected
fault codes' flashing patterns in ascending order.
• If no fault is detected, the Diagnostic lamp will flash
repeatedly at 2.4-second intervals.
8. Refer to the engine owner's manual for a complete
understanding of error codes and troubleshooting
procedures.
9. Upon completion of troubleshooting, place the
Diagnostic switch in the OFF position.
NOTICE
When a fault is detected, the fault code will automatically
be saved as a previous code in the ECM even after the
fault has been repaired.
NOTICE
The Diagnostic lamp will indicate the current fault code
with the previous fault code in ascending order.
NOTICE
If a fault occurs while the engine is running, the
Diagnostic lamp will turn on indicating only the current
fault. Please note that the fault code blinking pattern
cannot be shown while the engine is running.