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Briggs & Stratton Power Products Backup Power System
Owner’s Manual
15
MAINTENANCE
Fault Detection System
The generator may have to run for long periods of time
with no operator present. For that reason, the system is
equipped with sensors that automatically shut down the
generator in the event of potentially damaging conditions,
such as low oil pressure, high oil temperature, over speed,
and other conditions.
A light on the control panel called the Diagnostic LED will
turn on and off in a series of blinks.The blink pattern is
repeated with a brief pause between each series.The
number of blinks in the series indicates the detected fault,
as listed on the control panel and below:
Number of LED Flashes Fault Description
1 Low battery voltage
2 Low oil pressure
3 Low voltage
4 Engine fail to start
5 Low frequency
6 Engine overspeed
7 Oil temperature high
Reset Fault Detection System
The operator must reset the fault detection system each
time it activates.To do so, place the AUTO/OFF/MANUAL
switch in the OFF position for 30 seconds or more.
Return the backup power system to service after
correcting the problem by placing the
AUTO/OFF/MANUAL switch in the AUTO position.
A description of each fault and suggested remedies are as
follows:
No Blinks - ‘Dead’ Unit
This condition is caused by a completely dead starting
battery.To remedy the problem, remove the 15 Amp fuse
and disconnect the battery from the generator.Take the
battery to a local battery store for analysis. Replace battery
only with a genuine Generac part number 188443.
Replace the battery in the battery compartment after it has
been fully recharged, connecting the NEGATIVE cable last.
Install the 15 Amp fuse. Reset the Fault Detection system
as described above.
Low Battery Voltage
This fault is indicated by one blink.This condition occurs if
the generator cannot start because the starting battery
output power is below that needed to ‘turn-over’ the
engine. Causes for this problem may be a failed battery or a
failed trickle charger circuit.
To remedy the problem, remove the 15 Amp fuse and
disconnect the battery from the generator.Take the battery
to a local battery store for analysis. Replace battery only
with a genuine Generac part number 188443.
Replace the battery in the battery compartment after it has
been fully recharged, connecting the NEGATIVE cable last.
Install the 15 Amp fuse. Reset the Fault Detection system
as described above. Check battery trickle charge output.
Low Oil Pressure
This fault is indicated by two blinks.The unit is equipped
with an oil pressure switch (Figure 5) using normally closed
contacts that are held open by engine oil pressure during
operation. Should oil pressure drop below the 8 psi range,
switch contacts close and the engine is shut down.
To remedy the low oil pressure condition, fix any obvious
oil leak and/or add the recommended oil to the FULL mark
on the dipstick. Reset the Fault Detection system as
described above.
If low oil pressure condition still exists, engine will start,
then shut down after about 10 seconds and diagnostic LED
will flash. In this case, contact an authorized service facility.
Figure 5 — Low Oil Pressure & High Temp. Switches
High
Temperature
Switch
Oil Drain
Fitting
Oil
Pressure
Switch