Repair manual

Troubleshooting GP Repair

wc_tx000548gb.fm 90

4.27 Diagnosing GFI Tripping

See Graphic: wc_gr003570

A common cause for nuisance tripping of the GFI is incorrect wiring. If

you experience tripping of the GFI when changing from the 120V mode

to the 240V mode, check the wiring running through the GFI. There

should be four brown wires and two blue wires running through the

ammeter portion (a) of the GFI. If you have any other combination,

refer to the wiring schematic and correct the situation.

If you’re not sure whether tripping of the main circuit breaker is due to

the GFI or due to the main circuit breaker, carry out the following test:

4.27.1 Turn off the generator.

4.27.2 Disconnect yellow wire (b) from the shunt of the main circuit breaker.

4.27.3 Place the main circuit breaker in the 120V mode position.

4.27.4 Start the generator and switch the main circuit breaker from the 120V

position to the 240V position.

• If the GFI trips and its red light is on, the problem lies within the

GFI. Check the wiring through the ammeter portion of the GFI. If

the wiring is correct, replace the GFI.

• If the GFI does not trip, the problem lies in the main circuit

breaker. Replace the main circuit breaker.

wc_gr003570