TurboChef Technologies Residential Single and Double Wall Oven - Manual (Page 72)

6.8 TROUBLESHOOTING
3. Turn the CookWheel to favorites or the lower
cook mode knob to bake. You should hear the
fans running and also feel a slight amount of air
being discharged from the bottom of the oven.
4. If the fans are not operating, remove the oven
from the cabinet approximately 11” (279 mm)
and remove the top front panel.
5. Check the motion sensor signal outputs to the
control board by applying multimeter probes to
P9-7 and P9-17 for the bottom cooling fan and
P8-10 and P7-12 for the top cooling fan.
- If 2.5 VDC is present, the fan is functioning
normally. If both cooling fans register 2.5
VDC while the cooling fan failure message
is displayed, the control board is faulty and
needs to be replaced.
- If 5 VDC or 0 VDC is present, either a
cooling fan motion sensor is faulty or a
motor assembly is not functioning and
needs to be tested.
6. If neither fan is operating, check the 5 amp fuse
located on the right magnetron cover in the top
oven electrical compartment. If the fuse has not
blown, Check the operation of the Cookwheel
and the K9 relay. If the fuse has blown, continue
to step 7 before replacing fuse.
7. Troubleshoot the following potential reasons as
to why the fuse was blown:
- Does the control board reset when the
CookWheel is in the off mode?
- Was/is there a supply power surge?
- Is the cooling fan faulty?
- Is any wiring faulty?
- Is the control board faulty?
8. Remove the 5-amp fuse, turn the Cookwheel to
off , and check the single side terminal of the
fuse block for 120 VAC.
9. If voltage is present, check the control board for
24 VDC at pins P7-3 and P8-16 (K1-A), P7-3
and P8-15 (K1-B), P8-9 and P7-8 (K8). If 24
VDC is present on one or more of these test
points, replace the control board. If the 5-amp
fuse was blown and no 24 VDC found, check
the K1 and K8 relays for shorted closed condition.
10. If after performing the above steps the cooling
fans are still not functioning, completely remove
the oven from the cabinet for access.
Possible components to be replaced:
- Cooling fan assembly
- F3 5 amp fuse (Gen 1)
- CookWheel mechanical switch
(Speedcook
oven)
- Cook mode mechanical switch (lower oven)
- 140°F (60°C) snap switch (Speedcook oven)
- 160°F (71°C) snap switch (lower oven)
-
Control board
- K9 Relay
Cooling Fan Overview (Gen 2)
Th e Gen 2 double wall oven has two cooling fans:
one for the top oven and one for the bottom oven.
Th
e single wall oven also has two cooling fans, but
the lower cooling fan has a sail switch instead of a
hall eff ect motion sensor to check fan operation. If
the sail switch fails to close, a cooling fan error will
be displayed.
Components that activate the cooling fans are:
- CookWheel (Speedcook oven)
- Mode knob (lower double wall oven)
- 140°F (60°C) snap switch (Speedcook oven)
- 160°F (71°C) snap switch (lower oven)
- Control board when the Speedcook cavity
temperature is above 350°F (177°C) and the
Cook-Wheel is in the off position.
-
Relay board
NOTE: If the CookWheel is set to “off ,” the cooling
fans will stay on for an additional 2 minutes after
the cook cavity temperature recedes below 350°F
(177°C). If the CookWheel is set to any other mode,
the fans will remain on.
NOTE: If the Speedcook cook cavity temperature
is above 350°F (177°C) or either snap switch has
closed, the cooling fans will remain on even if the
CookWheel is in the off mode.
Troubleshooting Cooling Fans (Gen 1)
If a cooling fan failure message is displayed, test the
top and bottom motor assemblies by performing the
following steps:
1. Press the Cancel button on the top display to
clear the cooling fan error message.
2. Turn the CookWheel to the off position. Th e
cooling fans should turn off (unless one of the
snap switches has closed). Th
e magnetron fans
will continue to operate for two minutes.