Primus D11, Service Manual

Page: 103 / 160

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101
Section 7 Electronic Control Troubleshooting
87. WILL NOT HEAT – STEAM – ROTARY COIN DROP
(Sheet 1 of 2)
T066D
Is there voltage across
terminals 1 & 6 of
the temp control
Is there voltage across
terminals 5 & 6 of
the temp control
board?
board?
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
COM on switch B to
transformer neutral?
NO
Correct wiring between
airflow switch and
COM on switch B.
Is there voltage from
N.C. on switch B to
transformer neutral?
Replace switch B.
YES
NO
YES
Is there voltage from
terminal 6 on CR2 to
transformer neutral?
Correct wiring
between terminal 6
on CR2 to terminal
N.C. on switch B.
NO
YES
Is there voltage from
terminal 4 on CR2 to
transformer neutral?
Replace CR2.
NO
YES
Correct wiring
between terminal
4 on CR2 &
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
tumblers with
and without time delay.
Is the unit equipped
with a time delay
board?
NO
YES
Is there voltage on
terminal 3 of fan motor to
transformer neutral?
With fan motor
running is there voltage
from terminal 5 to
transformer
neutral?
Correct wiring
between terminal
3 of fan motor
and N.C. terminal
on switch B.
NO
YES
Replace fan motor.
Is there voltage on
terminal 1 of temp
board to transformer
neutral?
NO
YES
NO
YES
Correct wiring
between terminal
1 of temp board
to terminal 5 of
fan motor.
Power supply to
temp control
board is good.
Is temperature
selection switch
shorted or open?
Replace selection
switch.
YES
NO
T066D