Service manual

46 801681
Section 3 Troubleshooting (NetMaster and MDC Models)
© Copyright, Alliance Laundry Systems LLC – DO NOT COPY or TRANSMIT
21. SERIAL COMMUNICATION ERROR (E:SP ON DISPLAY)
*Is there
120 Volts across
terminals "H1-1" and
"H1-3" on motor
control?
Replace
electronic
control.
Tighten fuse
holder and/or
replace fuse.
No No
Yes
(2)
(1)
(3)
(4)
No
Correct wiring from
electronic control to
motor control.
Is there
continuity through
each wire of the harness
from H2 on the electronic
control to H7 on the
motor control?
*NOTE: Machine must be restarted to check
voltage. Voltage is intermittently present
for the first 15 seconds until E:SP is displayed.
Yes
Replace the
motor control.
Replace the
harness.
*Is there
120 Volts across
terminals "H6-5" and
"H6-6" on the
electronic
control?
Is the fuse loose or
blown on the motor
control board?
Yes
No
Yes
FLW1719S