Graco Therm-O-Flow 20 Instructions - Parts Manual page 45

Code Description
V8M# No Line Voltage
MZLP _
V4M# AWB High Line
Voltage
WJ1 Pump _ Solenoid is
disconnected
WJ2 Pump _ Solenoid
High Current
WSUX Configuration Error
USB
334129S
Type Cause
Alarm Incoming line
voltage is less
than 100 VAC.
Alarm Incoming
voltage is too
high
Alarm Pump is not
turning on
when it should
Alarm Solenoid is
drawing too
much current
Advisory USB
configuration
is not loaded
Solution
Verify Transformer has the correct tap
selected.
Verify CB-1 or FU-4, FU-5, and FU-6 are not
tripped/blown.
Verify RCD-1 is not tripped.
Measure incoming power with system
unplugged. If line voltage is less than 100 VAC,
contact qualified electrician to correct the low
voltage.
Verify the MZLP is plugged in at J2 and the
AWB is plugged in at J5 or J6.
Check incoming voltage is correct for
configuration.
Verify the transformer has the correct tap (400,
480, 600) selected.
Verify harness is plugged into J13 of the
daughter board. Verify it is secured to the
solenoid.
Replace Solenoid.
Inspect for short in harness. Inspect for a
shorted solenoid cable/short to the ground.
Replace solenoid.
Install software.
Troubleshooting
45