Operating & Installation Manual for the GSC300 Engine Controller
20
TROUBLESHOOTING GUIDELINES
TROUBLE
POSSIBLE CAUSE
SUGGESTED ACTION
Power leads to unit are reversed
Confirm correct wiring for ground and +bat,
and re-attempt testing.
Unit does not operate when
powered to test mode
Bad ground connection from engine to
controller unit.
Run wire directly from battery - to the
ground terminal #11on controller unit.
Engine starts and
immediately goes into
Overspeed shutdown
Improper speed range
Check to ensure that the speed sensing
wires of the controller are connected to the
generator output.
Battery is low or terminals are dirty
Clean terminals and re-charge battery
Crank circuitry wiring improperly
connected
Refer to engine control wiring section and
check crank connections
Bad ground connection from engine to
controller
Run wire directly from battery - to the
ground terminal #5 & 6, on controller unit.
Engine does not crank
Crank relay damaged. Or on board fuse is
blown
Check wiring, in line fuse and slave relay.
Replace fuse, relay and re-test controller
again
Out of fuel
Check fuel level, add fuel if necessary
Ignition control wiring not installed
properly
Refer to engine control wiring section and
check ignition connections
Engine cranks but does not
start
Fuel relay damaged
Check fuel relay and replace if damaged.
Engine starts but shuts
down after “
Oil Bypass
TM
period” due to low oil/high
temp/Aux input
Oil/Temp/Auxiliary input wiring improperly
connected.
Check wiring for proper connections.
Fault LED works OK, but
general fault output does not
activate
Fault (short or overload) on general fault
output.
Check for fault, once fault is corrected then
output operation resumes.
Speed signal improperly connected,
missing, or damaged.
Check speed signal wiring; replace
damaged speed signal source.
Crank output damaged, not working
Check wiring and replace controller if
necessary
Flashing Overspeed LED
Starter or starter solenoid damaged
Replace/repair damaged starter or starter
solenoid.
Flashing Run LED & Solid
Oil LED
Oil switch not closed as it should be
Check oil switch wiring and switch to make
sure the switch is closing when there is no
oil pressure
Install a small step down transformer
between the speed sensing wires and the
generator output.
Solid Oil LED immediately
on start-up, without engine
actually cranking or starting.
False speed signal being detected by
controller. This problem can sometimes
occur in installations where there is AC
power from inverters near generator
output lines connected to the speed signal
cable.
If the neutral from the generator output is
not grounded, attach it to ground
Display Parameter for
Temperature, Oil or Fuel
displayed as >>> or <<<
Parameter is >>> ABOVE or <<< BELOW
specified manufacturer sender range.
Install sender with proper range
specifications.
Warm-Up Feature appears
longer then time setting.
Warm-Up Feature time setting does not
begin until the Oil Bypass Time has
expired.
Re-adjust Oil Bypass and/or Warm-Up
timing.
