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WL500
Manual
Page 78 Revision 4‐10‐2019
5.
Ground Fault Circuit Interrupter (GFCI) Tripping:
Ground fault circuit interrupters or GFCI’s are specifically designed to protect people against electric
shock as it monitors the imbalance of current between the ungrounded (hot ‐ white) supply and
grounded (neutral ‐black) return conductor of a given circuit. A small (5 mA) difference in current or
stray current will trip the GFCI. Detecting dangerous current flow and instantly shutting off power
before deadly accidental occur. The sensitive circuitry inside older (pre 2006) GFCI can wear out or
malfunction and usually the test button on the GFCI itself doesn't tell you there's anything wrong.
Testing GFCI:
The only reliable way to check an older GFCI is to use a circuit
tester that has its own GFCI test button (available at home
centers and hardware stores).
Once the GFCI circuit has been properly checked, we can attempt
to pinpoint the potential problem within the unit by isolating the
stray current.
Plugging the suspect unit into another GFCI outlet on can indicate
if stray currents are present within the unit itself.
Attempt to isolate the fault or stray current by using the following methodology:
1.
Plug into properly functioning GFCI with both switches in Off (O) position.
1.1.
GFCI Fault? Yes.
Identify stray current and/or inspect and replace faulty component(s)
up to the Main Power Switch (Red):
Power cord
Power Socket
Fuse Holder Assembly
1.2.
GFCI Does Not Fault. Go to step 2.
2.
Turn On Main Power (Red) Switch.
Toggle to the On position (I=ON).
Switch should light to indicate
power on.
2.1.
GFCI Fault? Yes. Go to Step 3.
2.2.
GFCI Does Not Fault. Go to Step 5.
Isolate or disconnect unit from power and open Top Cover to access
main Printed Circuit Board (PCB).
3.
Isolate (disconnect) Main PCB
GREEN RED
GREEN RED