Will Not Heat - Gas - Rotary Coin Drop - ALLIANCE T30 Series Troubleshooting Manual

Electronic Control Troubleshooting
45. Will Not Heat – Gas – Rotary Coin Drop
Is there voltage across
terminals 1 & 6 of
the temp control bd?
Is there voltage across
YES
terminals 5 & 6 of
the temp control bd?
Is the thermistor
shorted or open?
Is temperature
selection switch
shorted or open?
temperature
control board.
Is there voltage on
terminal 3 of fan motor
to transformer
With fan motor
running is there voltage
from terminal 5 to
Is there voltage on
terminal 1 of temp
board to transformer
CONTINUED
Power supply to
ON NEXT
temp control
board is good.
PAGE
84
Single and stacked
tumblers with
and without time delay.
NO
YES
NO
YES
Replace thermistor.
NO
YES
Replace selection
switch.
NO
Replace the
Correct wiring
between terminal
NO
3 of fan motor
and N.C. terminal
neutral?
on switch B.
YES
NO
Replace fan motor.
transformer
neutral?
YES
Correct wiring
between terminal
NO
1 of temp board
to terminal 5
neutral?
of fan motor.
YES
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Is there voltage at
airflow switch N.C.
terminal to transformer
neutral?
YES
Is there voltage at
COM on switch B to
transformer neutral?
YES
Is there voltage from
N.C. on switch B to
transformer neutral?
YES
Is the unit equipped
YES
with a time delay
board?
NO
Is there voltage from
terminal 6 on CR2 to
transformer neutral?
YES
Is there voltage from
terminal 4 on CR2 to
transformer neutral?
YES
Correct wiring
between terminal
4 on CR2 &
terminal 1 on
temp control
board.
Replace inoperative
NO
switch or correct
airflow vane operation.
Correct wiring
NO
between airflow
switch and COM on
switch B.
NO
Replace switch B.
Correct wiring
NO
between terminal 6
on CR2 to terminal
N.C. on switch B.
NO
Replace CR2.
T090D
T090D
70291301