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

39. Will Not Heat – Electric – Manual Timer
NOTE: The following tests are conducted with
the heat timer in the "ON" position with the
machine running and calling for heat. Voltage
checks are referenced to transformer neutral.
Is there voltage across
terminals 1 & 6 of
the temp control bd?
YES
Is there voltage across
YES
terminals 5 & 6 of
the temp control bd?
NO
Is the thermistor
shorted or open?
NO
Is temperature
selection switch
shorted or open?
NO
Replace the
temperature
control board.
CONTINUED
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With and without time delay board.
Single and stacked units. Single and
three phase power supply.
NO
YES
Replace thermistor.
YES
Replace selection
switch.
Is there
Correct wiring
voltage to
NO
between fan motor
terminal 3 of
terminal 3 and
fan motor?
CR1 terminal 4.
YES
Is there voltage
NO
at terminal 3 & 5
of fan motor?
YES
Correct wiring
between motor
terminal 5 and
temp control
board terminal 1.
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airflow switch
N.C. terminal to
Is there voltage at
terminal 6 on CR1 to
transformer neutral?
Is there voltage from
terminal 4 on CR1 to
transformer neutral?
YES
Is unit equipped with
time delay board?
Is there voltage from
terminal 6 on CR2 to
transformer neutral?
Is there voltage from
terminal 4 on CR2 to
transformer neutral?
Replace fan motor.
Correct wiring
between CR2
terminal 4 &
terminal 1 on
temp control
Electronic Control Troubleshooting
Is there
voltage at
Replace inoperative
NO
switch or correct
airflow vane operation.
transformer
neutral?
YES
Correct wiring between
NO
airflow switch and
terminal 6 on CR1.
YES
NO
Replace CR1.
YES
NO
Correct wiring
NO
between terminal 6
on CR2 to terminal
YES
NO
Replace CR2.
YES
board.
4 on CR1.
T054D
T054D
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