Troubleshooting
3A1183C
21
Pressure Control Repair
Motor Control Board Diagnostics
NOTE:
Keep a new transducer on hand to use for test.
1.
For sprayers with digital display, see
Digital Display
Messages
, page 22
2.
Remove screws and cover.
3.
Turn ON/OFF switch ON.
4.
Observe LED operation and reference following
table:
Relieve pressure and unplug sprayer before servicing
control board. See
Pressure Relief Procedure
,
page 13.
NOTICE
Do not allow sprayer to develop fluid pressure with-
out transducer installed. Leave prime/pressure relief
valve open if test transducer is used.
LED
BLINKS
SPRAYER OPERATION
INDICATES
WHAT TO DO
Once
Sprayer runs
Normal operation
Do nothing
Two times
repeatedly
Sprayer shuts down and
LED continues to blink two
times repeatedly
Run away pressure. Pressure
greater than 4500 psi (310 bar,
31 MPa) or damaged pressure
transducer.
Replace motor control board or
pressure transducer.
Three times
repeatedly
Sprayer shuts down and
LED continues to blink four
times repeatedly.
Pressure transducer is faulty or
missing
Check transducer connection.
Open prime/pressure relief valve.
Substitute new transducer for
transducer in sprayer. If sprayer
runs, replace transducer.
Four times
repeatedly
Sprayer shuts down and
LED continues to blink four
times repeatedly.
Line voltage is too high
Check for voltage supply prob-
lems
Five times
repeatedly
Sprayer does not start or
shuts down and LED con-
tinues to blink five times
repeatedly
Motor fault
Check for locked rotor, shorted
wiring or disconnected motor.
Repair or replace failed parts.
Six times
repeatedly
Sprayer shuts down and
LED blinks six times
repeatedly
Motor is too hot or there is a
fault in the motor thermal
device
Allow sprayer to cool. If sprayer
funs correctly when cool, check
motor fan function and air flow.
Keep sprayer in cool location. If
sprayer does not run when cool
and continues to blink 6 times,
replace motor.
Eight times
repeatedly
Sprayer stops or does not
run
High input voltage
Check power source for correct
voltage
