Generac Power Systems GEN27WN Operator's Manual page 18

A description of each fault and suggested remedies are
as follows:
No LED - Discharged Battery
If there is a detected fault condition but the LED is
not blinking, this is because the battery is completely
discharged. 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 the
battery after it has been fully recharged, connecting the
NEGATIVE cable last. Then install the 15 Amp fuse in the
control panel.
NOTE: With the battery installed, all wiring to transfer
switch and residential generator completed, utility power
supplied to the Automatic Transfer Switch, and the unit
in AUTO mode, the battery receives a trickle charge while
the engine is not running. The trickle charge is not able
to recharge a battery that is completely discharged. See
Battery in Maintenance.
Low Battery Voltage (FC_1)
This fault is indicated by fault code FC_1 and one blink on
the LED indicator. This condition occurs if the generator
cannot start because the starting battery output power is
below that needed to crank the engine. Causes for this
problem may be a faulty battery or battery charge circuit.
To remedy the problem, contact your local service center to
check the battery charge output. Remove the 15 Amp fuse
and disconnect the battery from the generator. Take the
battery to a local battery store for analysis.
Replace the battery after it has been fully recharged,
connecting the NEGATIVE cable last. Then install the 15 Amp
fuse in control panel and reset exercise timer. See Setting
Exercise Timer in Operation.
Low Oil Pressure (FC_2)
This fault is indicated by fault code FC_2 and two blinks on
the remote LED indicator. The unit is equipped with an oil
pressure switch that uses normally closed contacts 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, add the
recommended oil to the FULL mark on the dipstick.
If the low oil pressure condition still exists, the engine will
start, then shut down again. The fault code will appear and
the LED will flash. In this case, contact an Authorized Dealer.
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Low Voltage (Generator, FC_3)
This fault is indicated by fault code FC_3 and three blinks on
the LED indicator. This condition is caused by a restriction in
the fuel flow, a broken or disconnected signal lead, a failed
alternator winding, the control panel circuit breaker is open,
or the generator is overloaded.
To remedy the problem, contact your installer or an
Authorized Dealer.
Engine Fail To Start (FC_4)
This fault is indicated by fault code FC_4 and four blinks on
the LED indicator. This feature prevents the generator from
damaging itself if it continually attempts to start in spite
of another problem, such as no fuel supply. Each time the
system is directed to start, the unit will crank for 10 seconds,
pause for 10 seconds, and repeat. If the system does not
begin producing electricity after approximately 2 minutes,
the unit will stop cranking and the LED will blink.
Check to make sure the generator's main circuit breaker is in
the ON position in order for the sensing leads to verify that
the unit is running.
The most likely cause of this problem is no fuel supply.
Check the internal and external fuel shut off valves to
ensure they are fully open. Other causes could be failed
spark plug(s), failed engine ignition, or the engine air filter
is clogged. You may need to contact your installer for
assistance if you can't remedy these problems.
Low Frequency (FC_5)
This fault is indicated by fault code FC_5 and five blinks on
the LED indicator. This feature protects devices connected
to the transfer switch by shutting the generator down if
the engine runs slower than 55 Hz for three seconds. This
condition is caused by a failed engine component or by
excessive loads on the generator. To remedy the problem,
contact your installer or an Authorized Dealer.
Engine Overspeed (FC_6)
This fault is indicated by fault code FC_6 and six blinks on
the LED indicator. This feature protects devices connected
to the transfer switch by shutting the generator down if
the engine happens to run faster than the preset limit. The
overspeed fault is detected as follows:
• If the generator output frequency is 65-70 Hz, after
three seconds, the generator will shut down.
• If the generator output frequency is greater than 70 Hz,
the generator will shut down immediately.
This condition is caused by a failed engine component. To
remedy the problem, contact your installer or an Authorized
Dealer.