Graco Mark VII Max Repair Manual page 18

Troubleshooting
Sprayer Will Not Run
(See following page for steps)
Remove control box cover. Turn
sprayer ON. Observe control
board status light on control board
(see page 13).
No light
Once Normal operation
Light on Control board
Continuously commanding
motor to run
Flashing See Code section
for further
troubleshooting
18
See Step 1. Do
you have over
100 VAC
(220 VAC for
230V units)?
YES
See Step 3. Is the
proper reading
NO
present through the
thermal switch
wires?
YES
See step 4. Does
NO
the motor run?
YES
Replace
potentiometer.
See Step 2. Do
you have over
100 VAC
NO
(220 VAC for
230V units)?
YES
Replace the
ON/OFF switch.
If motor is hot, let cool and
retest. If Step 3 still shows
incorrect resistance, replace
motor. The motor has
a defective thermal device.
Connect a test
transducer to the
board. Does the
motor run?
YES
Replace the
transducer
Repair or
NO
replace
power cord.
NO
Replace the
control board.
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