Alliance Laundry Systems CA050L - 58 Unit will Not Heat - Gas

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On Premise Micro Control (OM) Troubleshooting
58.Unit Will Not Heat – Gas
Is there
voltage to the
N.O. terminal
of the airflow
switch?
Is
there
voltage to
terminal 3 of the motor
centrifical
switch?
Unit Will Not
Heat – Gas
Is there
voltage at H2-5
of control?
Is
there voltage
on ORG/WHT
wire on motor
contactor?
Yes
Replace
thermistor.
Replace
contactor.
No
Is there
voltage to the
input of the
cabinet limit?
No
Correct wiring
between cabinet
limit and terminal
5 of fan motor.
Is there
voltage to the
output of the
cabinet
limit?
No
Check cabinet
limit for proper
operation.
Replace
if necessary.
TMB2340S-a
Yes
No
Correct wiring
between airflow
switch and
cabinet limit.
Is there
voltage to the
common of the
airflow
switch?
Yes
Is there
voltage at BRN
wire on motor
contactor?
All voltage checks are referenced
to transformer neutral.
(1)
(5)
(8)
(9)
(2)
Note: Tests are conducted with
unit running and calling for heat.
(6)
Correct wiring
between motor
terminal 3 and
motor centrifical
switch.
Is there
voltage at terminal
5 of the fan
motor?
No
Yes
Check motor for
proper operation.
Replace if
necessary.
No
(7)
Is the
thermistor
operational?
No
Replace
control.
(4)
No
Yes
Yes
No
(3)
Check for proper
operation of
airflow switch.
Replace if
necessary.
Yes
No
Is there
voltage to the
input of the
stove limit?
Correct wiring
between stove
limit and normally
open terminal of
the airflow switch.
(10)
Yes
No
Continued on
next page
Yes
Yes
Correct harness
between airflow
switch and
contactor.
TMB2340S-a