GN5060, GN6575

Troubleshooting Chart

Symptom

Possible Cause(s)

Corrective Action

 

 

 

 

 

Engine will not

1.

Run switch is set to "OFF".

1.

Set run switch to "ON".

start

2.

Fuel valve is turned to "CLOSE".

2.

Turn fuel valve to "OPEN" position.

 

3.

Choke is open.

3.

Close the choke.

 

4.

Fuel tank is empty.

4.

Add gas.

 

5.

Engine is filled with

5.

Change the gas in the engine.

 

 

contaminated or old gas

6.

Clean spark plug.

 

6.

Spark plug is dirty.

 

7.

Spark plug is broken.

7.

Replace spark plug.

 

8.

Unit is not on level surface.

8.

Move unit to a level surface to prevent low oil shutdown from

 

 

 

 

triggering.

 

9.

Oil is low.

9.

Add or replace oil.

Engine runs

1.

Main or secondary circuit

1.

Reset main or secondary circuit breaker(s).

but there is no

 

breaker(s) are tripped.

 

 

electrical output

2.

Bad connecting of wires/cables.

2.

If you are using an extension cord, try a different one.

 

3.

Bad electrical device connected

3.

Try connecting a different device.

 

 

to generator.

 

 

Generator runs

1.

Generator is overloaded

1.

Turn off all electrical devices. Unplug all electrical devices. Turn

but does not

 

 

 

off generator. Wait several minutes. Restart generator. Try

support all

 

 

 

connecting fewer electrical loads to the generator.

electrical devices

2.

Short in one of the connected

2.

Try disconnecting any faulty or short-circuited electrical loads.

connected.

 

devices.

 

 

 

3.

Air cleaner is dirty.

3.

Clean or replace air cleaner.

No output

1.

Engine speed is too slow

1.

Adjust engine speed. ★

voltage

2.

Open, shorted, or incorrect

2.

Referring to the wiring diagram, clean and reconnect all

 

 

wiring

 

wiring. ★

 

3.

Faulty capacitor

3.

Replace capacitor. ★

 

4.

Open or shorted field windings

4.

Test winding resistance, replace field winding if necessary. ★

 

5.

Open diodes

5.

Test diodes, replace if necessary. ★

 

6.

Circuit breaker tripped

6.

Reset circuit breaker.

Low output

1.

Engine speed is too slow

1.

Adjust engine speed. ★

voltage with no

2.

Open diodes

2.

Test diodes, replace if necessary. ★

load

3.

Faulty capacitor

3.

Replace capacitor. ★

 

4.

Open or shorted field windings

4.

Test winding resistance, replace field winding if necessary. ★

High output

1.

Faulty capacitor

1.

Replace capacitor. ★

voltage with no

2.

Engine speed is too fast

2.

Adjust engine speed. ★

load

 

 

 

 

Low output

1.

Open diode

1.

Test diodes, replace if necessary. ★

voltage under

2.

Engine speed too slow at full

2.

Adjust engine speed. ★

load

 

load

3.

Reduce the applied load.

 

3.

Excessive load applied

 

 

Erratic output

1.

Unbalanced engine

1.

Refer to engine manual.

voltage

2.

Dirty, corroded, or loose wiring

2.

Referring to the wiring diagram, clean and reconnect all

 

 

connection

 

wiring. ★

 

3.

Unstable load applied

3.

Remove all loads, then apply each one individually to

 

 

 

 

determine which one is causing erratic function.

Noisy operation

1.

Loose generator or engine bolt

1.

Tighten all mountings.

 

2.

Short circuit in generator field or

2.

Test winding resistance, replace field winding if necessary. ★

 

 

load

 

Test load devices for shorts. Replace defective load device.

 

3.

Faulty bearing

3.

Replace bearing.

Auto-Idle does

1.

Damaged or disconnect wire in

1.

Repair or replace wiring.

not work

 

idle control circuit.

 

 

 

2.

Failed idle control circuit board.

2.

Replace idle control board.

 

3.

Failed current sensing coil.

3.

Replace current sensing coil.

★These diagnostic and repair procedures should be performed by an authorized service center.

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