Will Not Heat - Gas - Edc Models - ALLIANCE T30 Series Troubleshooting Manual

Electronic Control Troubleshooting
43. Will Not Heat – Gas – EDC Models
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 across
COM & N.C. terminal
of airflow switch?
NO
Is there voltage on
terminal 7 of motor
control relay?
YES
Is there voltage across
terminals 7 & 4 of
motor control relay?
NO
80
Single and stacked
units.
Correct wiring
NO
between FS-2 and
COM of lint drawer.
Replace EDC
Replace
control.
thermistor.
NO
NO
Is the
YES
thermistor
operational?
Correct wiring
between COM of
NO
airflow switch and
FS-1 of EDC
control.
Check for proper
YES
function of airflow
switch and replace
if necessary.
Correct wiring
between terminal
NO
7 on motor
control relay and
N.C. terminal on
airflow switch.
YES
Replace motor
control relay.
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Is there voltage on
NO
terminal 3 of fan
motor centrifugal
switch?
YES
Is there voltage across
YES
terminals 3 & 5 of
fan motor centrifugal
switch?
NO
NO
Is there voltage to the
input side of the
cabinet limit?
YES
YES
Is there voltage across
cabinet limit?
NO
Is there voltage to the NO
input side of the stove
limit?
YES
Continued on next
page.
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
and cabinet limit.
T032D
T032D
70291301