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

Electronic Control Troubleshooting
44. Will Not Heat – Gas – 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 the temperature
selection switch
shorted or open?
NO
Replace the
temperature
control board.
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Single and stacked units with and without time
NO
YES
Replace thermistor.
YES Replace selection
switch.
Is there
Correct wiring
voltage to
NO
between fan motor
terminal 3 of
terminal 3 and CR1
fan motor?
YES
Is
there voltage
YES
across terminal
3 & 5 of fan
motor?
NO
Correct wiring
between motor
terminal 5 and
temp control board
terminal 1.
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delay boards.
there voltage at
airlow 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?
terminal 4.
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
Is
Replace inoperative
NO
switch or correct
airflow vane operation.
transformer
neutral?
YES
Correct wiring between
NO
airlow 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.
T044D
T044D
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