TurboChef Technologies Residential Single and Double Wall Oven - Manual (Page 73)

TROUBLESHOO
TING
6.9
- For the single wall oven, turn the
CookWheel to favorites and test pins J16-2
and J16-3 for 0 VDC at the control board.
If 0 VDC is present, then the sail switch is
activated, indicating the lower fan is
turning. If approximately 4.5 VDC is
present, either the fan is not turning or the
switch is stuck. Remove the fan to
determine the faulty part.
NOTE: Single Wall Ovens do not use a motion
sensor on the bottom fan.
5. If both fans are functioning and sending the
correct voltage to the control board, but a
cooling fan error is displayed, replace the control
board.
6. If the cooling fans do not operate properly,
check the following components:
- Cooling fan assembly (top and bottom)
- CookWheel switch (Speedcook oven)
- Mode mechanical switch (bottom oven)
- 140°F (60°C) snap switch (Speedcook oven)
- 160°F (71°C) snap switch (lower oven)
- Sail switch (single wall oven only)
- Control board
- Relay board
Air Impingement System
Th is section contains information on:
- Blower motors, Speedcook oven
- Convection fan, lower oven
Blower Motors, Speedcook Oven
1. Access the Speedcook oven blower motors (see
pages A.24 and A.26).
2. To test the blower motors, take an ohm
reading of each motor. Disconnect the output
from the motor controller (BMSC) and check
the ohms from phase to phase (red to black,
black to white, and red to white). All the
readings must be between 5.9 and 7.3 ohms. If
any of these readings are diff erent, replace the
motor.
- Check the resistance through the meter
leads by touching them together. Subtract
this number from the reading of the motor
11. Turn the CookWheel to favorites.
12. Test the cooling fan motor assemblies by
applying voltmeter probes to the terminals on
the motor. Th
e voltage reading should be 120
VAC.
- If 120 VAC is present and the fan is not
functioning, replace the cooling fan.
- If voltage is not detected, test the source of
the voltage at the cookwheel mechanical
switch (top oven), mode mechanical switch
(bottom oven), 15 amp fuse, and the circuit
wiring for breaks.
Troubleshooting Cooling Fans (Gen 2)
If a cooling fan failure message is displayed, test the
top and bottom cooling fan motor assemblies:
1. Turn the CookWheel to off to clear the cooling
fan error message. Th
e cooling fans should turn
off after two minutes (unless one of the snap
switches has closed or the upper cook cavity is
above 350°F [177°C]).
2. Turn the CookWheel to favorites or the lower
mode knob to bake (double wall oven). You
should hear the fans running and also feel a
slight amount of air being discharged from the
bottom of the oven.
NOTE: Th e cooling fan error message will display
again after the CookWheel has been turned to
favorites for fi ve minutes. If the CookWheel is not
turned to favorites after the cooling fan error
message displays, the cooling fans will turn off after
approximately 2 minutes.
3. If the fans are not operating, remove the oven
from the cabinet approximately 11” (279 mm)
and remove the top front panel.
4. Check the motion sensor signal outputs to the
control
board:
- For the double wall oven, apply multimeter
probes to J15-16 and J15-17 for the top
oven cooling fan and J16-2 and J16-3 for
the bottom oven cooling fan. If the fans are
on, 2.5 VDC should be present. A reading
of 0.0 VDC or 5.0 VDC means the cooling
fans are not rotating. Check sensor wiring
and cooling fan for operation.