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

Micro Display Control Troubleshooting
56. Unit Will Not Heat – Electric
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
on 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 air flow switch?
NO
(5)
Is there voltage at
terminal 14 of motor
control relay?
YES
(6)
Is there voltage across
terminals 13 & 14 of
motor control relay?
NO
110
Single and stacked
units.
Correct wiring
NO
between FS-2 and
COM of lint panel
switch.
Replace EDC
control.
NO
YES
Is the
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 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)
Is there voltage across
YES
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 13 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.
TMB1842S
70291301