Alliance Laundry Systems CA050L - Unit Will Not Heat - Steam

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Micro Display Control (MDC) Troubleshooting
38.Unit Will Not Heat – Steam
Note: Tests are conducted with unit running
and calling for heat.
All voltage checks are referenced to
transformer neutral.
Correct wiring
between FS-2 and
COM of lint drawer.
Is there 24 VAC on
FS-2 of MDC control?
Is there 24 VAC
on FS-1 of MDC
control?
Correct wiring
between COM of
airflow switch and
FS-1 of MDC
control.
Is there 24 VAC on COM
of airflow switch?
Check for proper
function of airflow
switch and replace if
necessary
.
Is there
24 VAC at
N.C. terminal
of airflow
switch?
Correct wiring
between terminal 7
on motor control
relay and N.C.
terminal on airflow
switch.
Is there
24 VAC on
terminal 13 of
motor control
relay?
Replace motor
control relay.
Correct wiring
between terminal 3
of fan motor
centrifugal switch
and terminal 4 of
motor control relay.
Is there 24 VAC on
terminal 3 of fan
motor centrifugal
switch?
Replace fan motor.
Is there
24 VAC at
terminal 5 of fan
motor centrifugal
switch?
Correct wiring
between cabinet
limit and terminal 5
of fan motor
centrifugal switch.
Is there 24 VAC to the
input side of the
cabinet limit?
Replace cabinet
limit.
Is there
24 VAC to the output
side of the cabinet
limit?
NO
YES
Is the
thermistor
operational?
Replace MDC
control.
Replace
thermistor.
YES
NO
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
TMB2309S-a
Is there
24 VAC on
terminal 14 of
motor control
relay?
TMB2309S-a