Blower Failure Troubleshooting; Oven Over Temperature; Component Testing And Troubleshooting; Control System - TurboChef Residential Single and Double Wall Oven Service Manual

6.4 TROUBLESHOOTING

Blower Failure Troubleshooting

1. Confi rm the motor is turning freely. Check for
obstructions.
2. Test the upper motor for 0-10 VDC incoming on
- Gen 1: P10-1 and P7-17 (control board)
- Gen 2: RBJ22-5 and RBJ22-8 (relay board)
3. Test the lower motor for 0-10 VDC incoming on
- Gen 1: P10-2 and P7-19 (control board)
- Gen 2: RBJ22-6 and RBJ22-8 (relay board)
4. Check for line voltage to the motor controller
(power is supplied from the EMI fi lter).
5. Ohm-test the motors for 5.9-7.3 ohms.

Oven Over Temperature

To prevent temperature from running away during
normal oven operation, each oven cavity is monitored
by a thermostat (270°F [132°C] switch for Speedcook
cavity and 280°F [138°C] for the lower oven cavity in
double wall ovens). In both the single and double wall
oven, the switch(es) are wired to the control board
through P7-18 and P8-6 (Gen 1) or pins J15-18 and
J15-19 (Gen 2). If the ambient temperature near these
thermostats exceeds the temperatures given above, this
error screen is displayed. Th e thermostats are self reset-
ting; however, the oven is disabled until both switches
are closed.
Possible causes:
- Overheated oven
- Faulty wiring
- Faulty thermostat switch
- Faulty control board
Component Testing and
Troubleshooting
Th is section contains the following sub-sections:

- Control system

- Halogen light system
- Cooling system
- Air impingement system
- Microwave system
- Heating system, Speedcook oven
- Heating system, lower oven
Control System
Th is section contains testing and troubleshooting
procedures for the following components:

- Clock assembly

- Control board

- CookWheel control (Speedcook oven)

- EMI fi lter
- Oven mode switch (lower oven)
- Power supply, 12 VDC
- Power supply, 24 VDC
- RTD
- Transformer, clock, 12 VAC (located on relay
board on Gen 2 ovens)
Clock Assembly
1. Access the upper electrical compartment.
2. Apply voltmeter probes to pins 1 and 5 on the
clock assembly.
3. If approximately 12 VAC is present, the clock
assembly is faulty and needs to be replaced. If no
voltage is present, test the 12 VAC transformer.
Control Board
1. Verify all wiring is secure and correctly
connected. See section 7 for wiring schematics.
2. Ensure the SD card is in the unlocked position
(always remove power form the oven before
removing the SD card).
3. Troubleshoot other oven components related to
the failure if applicable.
4. If required, replace the control board.
5. Fill out the tag supplied with the replacement
board (identifying the issue) and return it to
TurboChef with the bad control board.
CookWheel Control (Speedcook Oven)
1. Access the upper electrical compartment.
2. Verify the CookWheel's switch closes and opens
normally. Th is test assumes that the CookWheel
is receiving voltage from the 15-amp fuse (see
page A.15 for Gen 1 location, page A.19 for
Gen 2 location). If no voltage is present, then
the lights, screens, clock, etc. will not function.
3. Disconnect the N.O. wire from the terminal.