Alliance Laundry Systems YT035E, Troubleshooting Manual

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Electronic Control Troubleshooting
63. Unit Will Not Heat – Gas
Note: Tests are conducted with unit running
and calling for heat.
All voltage checks are referenced to
transformer neutral.
Correct wiring
between H5-13 and
N.O. of airflow
switch.
Is there voltage at
H5-13 of control?
Is there voltage
at H5-1 of
control?
Correct wiring
between input
and H5-1.
Is there voltage at input
terminal of the motor
control relay?
Replace relay.
Is there voltage at
the output terminal
of the fan motor
relay?
Check wiring
between
motor terminal 3
and motor
relay.
Is there voltage at
terminal 3 of the fan
motor?
Check motor
or replace if
necessary.
Is there voltage at
terminal 5 of the fan
motor relay?
Check cabinet
limit for proper
operation. Replace
if necessary.
Is there voltage to the
output of the cabinet
limit?
Correct wiring
between cabinet limit
and stove limit
thermostat.
Is there voltage to the
input of the stove limit?
Check operation of
stove limit. Replace
if necessary.
Is there voltage to the
output side of the stove
limit?
No
Yes
Is the
thermistor
operational?
Replace
control.
Replace
thermistor.
Yes
No No
Yes
No
Yes
Yes
No
No
Yes
Yes
No
No
Yes
Yes
Yes
No
No
Yes
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TMB2275S-a
Correct wiring
between cabinet
limit and terminal 5
of fan motor.
Is there voltage to the
input of the cabinet
limit?
No