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Electronic Control Troubleshooting
47. Will Not Heat – Steam – Manual Timer
T019D
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?
Is there voltage across
terminals 5 & 6 of
the temp control bd?
YES
NO
Is there voltage at
airflow switch N.C.
terminal to transformer
neutral?
NO
Adjust the airflow
switch or replace if
inoperative.
NO
YES
Is there voltage at
terminal 6 on CR1 to
transformer neutral?
NO
Correct wiring
between airflow
switch and
terminal 6 on CR1.
Is there voltage from
terminal 4 on CR1 to
transformer neutral?
Replace CR1.
YES
NO
YES
Is there voltage from
terminal 6 on CR2 to
transformer neutral?
Correct wiring
between terminal 6
on CR2 to terminal
4 on CR1.
NO
YES
Is there voltage from
terminal 4 on CR2 to
transformer neutral?
Replace CR2.
NO
YES
Correct wiring
between CR2
terminal 4 &
terminal 1 on
temp control
board.
Is the thermistor
shorted or open?
NO
YES
Replace thermistor.
Replace the
temperature
control board.
YES
CONTINUED
ON NEXT
PAGE
Single and stacked units with and without time
delay boards, manual timers.
Is unit equipped with
time delay board?
NO
YES
Is there
voltage to
terminal 3 of
fan motor?
NO
YES
Correct wiring
between fan motor
terminal 3 and
CR1 terminal 4.
Is there voltage
across terminal
3 & 5 of fan
motor?
Replace fan motor.
YES
NO
Correct wiring
between motor
terminal 5 and
temp control
board terminal 1.
Replace selection
switch.
Is temperature
selection switch
shorted or open?
YES
NO
T01
9
D