Will Not Heat - Electric - ALLIANCE T30 Series Troubleshooting Manual

40. Will Not Heat – Electric
Note: Tests are conducted with unit running
and calling for heat.
All voltage checks are referenced to
transformer neutral.
Is there voltage on
FS-2 of EDC control?
YES
Is there voltage
on FS-1 of
EDC control?
YES
Is there voltage on
COM of airflow
switch?
YES
Is there voltage at
N.C. terminal of
airflow switch?
YES
Is there voltage on
terminal 7 of motor
control relay?
YES
Is there voltage at
terminal 4 of motor
control relay?
YES
70291301
Single and stacked units with single and three
NO
Correct wiring
between FS-2 and
COM of lint drawer.
Replace EDC
Replace
control.
thermistor.
NO NO
YES
Is the
thermistor
operational?
Correct wiring
NO
between COM of
airflow switch and
FS-1 of EDC
control.
Check for proper
NO
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.
NO
Replace motor
control relay.
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Electronic Control Troubleshooting
phase supply.
Is there voltage on
terminal 3 of fan
motor centrifugal
switch?
YES
Is there voltage at
terminal 5 of fan
motor centrifugal
switch?
YES
Is there voltage to the
input side of the
cabinet limit?
YES
Is there voltage at the
output of the cabinet
limit?
YES
Is there voltage to the
input side of the stove
limit?
YES
Continued on next
page.
Correct wiring
between terminal
NO
3 of fan motor
centrifugal switch
and terminal 4 of
motor control relay.
NO
Replace fan motor.
Correct wiring
NO
between cabinet
limit and terminal
5 of fan motor
centrifugal switch.
NO
Replace cabinet
limit.
NO
Correct wiring
between stove limit
and cabinet limit.
T034D
T034D
73