AIRLESSCO LP500 - Manual (Page 19)

Troubleshooting
3A1185H 19
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 Dis-
play Messages, page 20
2. Remove four 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 8.
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
runs 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