Service manual

116 70380601
© Copyright, Alliance Laundry Systems LLC – DO NOT COPY or TRANSMIT
On Premise Micro Control (OM) Troubleshooting
46.Unit Will Not Heat – Gas
Unit Will Not
Heat – Gas
Is there
voltage at H2-5
of control?
Is there
voltage on BRN
wire on motor
contactor?
Yes
Replace
thermistor.
Correct wiring
between H2-5 and
motor contactor.
No
Is
there
voltage to the
input of the
cabinet
limit?
No
Correct wiring
between cabinet
limit and terminal
5 of fan motor.
No
Check cabinet
limit for proper
operation.
Replace
if necessary.
TMB2283S-a
Yes
Yes
Is
there
voltage at ORG/WHT
wire on motor
contactor?
Yes
All voltage checks are referenced
to transformer neutral.
(1)
(8)
(9)
Note: Tests are conducted with
unit running and calling for heat.
Is the
thermistor
operational?
No
Replace
control.
(5)
Replace motor
contactor.
No
Yes
Yes
No
Is there
voltage to the
input of the
stove limit 1?
Correct wiring
between stove
limit 1 and normally
open terminal of
the airflow switch.
(10)
No
Continued on
next page
Yes
Is there
voltage to the
N.O. terminal
of the airflow
switch?
No
Correct wiring
between airflow
switch and
cabinet limit.
Is there
voltage to the
common of the
airflow
switch?
(2)
(3)
(4)
Check for proper
operation of
airflow switch.
Replace if
necessary.
Yes
No
Yes
Is there
voltage to terminal 3
of the motor
contactor?
(6)
Correct wiring
between motor
terminal 3 and
motor contactor.
Is there
voltage at terminal
5 of the fan
motor?
No
Yes
Check motor for
proper operation.
Replace if
necessary.
No
(7)
Is
there
voltage to the
output of the
cabinet
limit?