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

55. Unit Will Not Heat – Steam
Note: Tests are conducted with unit running
and calling for heat.
All voltage checks are referenced to
transformer neutral.
(1)
Is there voltage on
FS-2 of EDC control?
YES
(2)
NO
Is there voltage
on FS-1 of
EDC control?
YES
(3)
Is there voltage on
COM of airflow
switch?
YES
(4)
Is there voltage across
COM & N.C. terminal
of airflow switch?
NO
(5)
Is there voltage on
terminal 7 of motor
control relay?
YES
(6)
Is there voltage across
terminals 7 & 4 of
motor control relay?
NO
70291301
Single and stacked
units.
NO
Correct wiring
between FS-2 and
COM of lint drawer.
Replace EDC
Replace
control.
thermistor.
NO
YES
Is the
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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Micro Display Control Troubleshooting
(7)
Is there voltage on
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 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.
TMB1841S
107