Service manual
48 800168
Section 3 Troubleshooting (MDC Models)
© Copyright, Alliance Laundry Systems LLC – DO NOT COPY or TRANSMIT
21. WASHER WILL NOT START – NO DOOR LOCK
Washer Will Not Start. No Door Lock.
Washer will not 
start. Vend 
satisfied.
Is there 120 Volt 
 AC across "H4-5" and 
"H6-5" on the control 
board?
(1)
(2)
Yes
Yes
Is there 120 Volt 
AC across "H4-4" to "H6-5" on 
 the control board?
(4)
Replace the Door 
Lock Assembly.
No
Is there 120 Volt 
 AC across "H6-1" and "H6-5" 
 on the control board? 
No
(5)
Replace the 
Control Board.
No
Is there voltage 
to the blu/blk input wire 
to the door switch on the 
 lock assembly?
Replace the Door 
Lock Assembly.
Yes
No
Is there voltage 
at the input blk wire coming 
into the secondary
 door switch? 
(3)
Replace the 
secondary door 
switch assembly.
Correct wiring to 
the secondary 
door switch.
Yes
No
Yes
FLW300S










