Graco NOVA Repair Manual page 5

WARNING
Improper installation or alteration of grounding plug
results in risk of electric shock, fire or explosion
that could cause serious injury or death.
1. All models require a 60 Hz, 15A circuit with a
120 Vac grounding receptacle. See Fig. 2.
2. Do not alter ground prong or use adapter.
Relieve pressure; page 4.
MOTOR WON'T OPERATE
TYPE OF PROBLEM
Basic Fluid Pressure
Problems
Basic Mechanical
Problems
Basic Electrical Problems
Grounding
Troubleshooting
WHAT TO CHECK
If check is OK, go to next check
1. Pressure control knob setting. Motor will not
run if at minimum setting (fully counterclock-
wise).
2. Spray tip or fluid filter may be clogged.
1. Pump (13) for frozen or hardened paint.
2. Displacement pump connecting rod pin (9a).
Pin must be completely pushed into connect-
ing rod (9) and retaining spring (9b) must be
firmly in groove of pump pin. See Fig. 10.
3. Motor (1). Remove drive housing assembly
(10). See page 15. Try to rotate fan by hand.
1. Motor control board. Board shuts down and
displays error code.
2. Electrical supply. Meter must read
85–130 Vac.
3. Extension cord. Check extension cord conti-
nuity with volt meter.
4. Sprayer power supply cord (79). Inspect for
damage such as broken insulation or wires.
Grounding Plug
Fig. 2
3. A 12 AWG, 3-wire with grounding prong, 300 ft
(90 m) extension cord may be used. Long lengths
reduce sprayer performance.
WHAT TO DO
When check is not OK refer to this column
1. Slowly increase pressure setting to see if mo-
tor starts.
2. Relieve pressure and clear clog or clean fil-
ter; refer to separate gun or tip instruction
manual.
1. Thaw sprayer if water or water-based paint
has frozen in sprayer. Place sprayer in warm
area to thaw. Do not start sprayer until
thawed completely. If paint hardened (dried)
in sprayer, replace pump packings. See
page 17 (Displacement Pump Replace-
ment).
2. Push pin into place and secure with spring re-
tainer.
3. Replace motor (1) if fan won't turn. See page
16.
1. See Motor Control Board Diagnostics,
page 13.
2. Reset building circuit breaker; replace build-
ing fuse. Try another outlet.
3. Replace extension cord.
4. Replace power supply cord.
Grounded
Outlets
5
824191