Unit Will Not Heat - Gas - ALLIANCE T30 Series Troubleshooting Manual

Micro Display Control Troubleshooting
54. Unit Will Not Heat – Gas
Note: Tests are conducted with unit running
and calling for heat.
All voltage checks are referenced to
transformer neutral.
(1)
Is there voltage at
FS-2 of EDC control?
YES
Replace
thermistor.
(2)
NO
Is there voltage
at FS-1 of EDC
control?
YES
(3)
Is there voltage at COM
of airflow switch?
YES
(4)
Is there voltage across
COM & N.C. terminal
of airflow switch?
NO
(5)
Is there voltage at
terminal 7 of motor
control relay?
YES
(6)
Is there voltage across
terminals 7 & 4 of
motor control relay?
NO
104
NO
Correct wiring
between FS-2 and
COM of lint drawer.
Replace EDC
control.
NO
Is the
YES
thermistor
operational?
Correct wiring
NO
between COM of
airflow switch and
FS-1 of EDC
control.
Check for proper
YES
function of airflow
switch and replace if
necessary.
Correct wiring
between terminal 7
NO
on motor control
relay and N.C.
terminal on airflow
switch.
YES
Replace motor
control relay.
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(7)
Is there voltage at
NO
terminal 3 of fan
motor centrifugal
switch?
YES
(8)
YES
Is there voltage across
terminals 3 & 5 of fan motor
centrifugal switch?
NO
(9)
NO
Is there voltage to the
input side of the
cabinet limit?
YES
(10)
YES
Is there voltage across
cabinet limit?
NO
(11)
NO
Is there voltage to the
input side of the stove
limit?
YES
Correct wiring
between terminal 3
of fan motor
centrifugal switch
and terminal 4 of
motor control relay.
Replace fan motor.
Correct wiring
between cabinet
limit and terminal 5
of fan motor
centrifugal switch.
Replace cabinet
limit.
Correct wiring
between stove limit 1
and cabinet limit.
TMB1869S
70291301