Viking Convection Oven Fan Not Spinning in Bake Mode:... | appliancefaults.com

Technical Background:

The oven's main control unit (MCU) monitors the oven temperature via the RTD sensor. In bake mode, the MCU energizes the convection fan relay on the control board, which sends 120V AC to the convection fan motor. If any component in this circuit fails, the fan will not operate.

Symptoms:

The Viking oven operates normally in all modes except bake mode. During bake mode, the convection fan does not spin, resulting in uneven cooking or longer cooking times. The oven heating element still functions.

Possible Causes:

Faulty convection fan motor
Defective convection fan relay on the control board
Failed oven temperature sensor (RTD)
Wiring harness issue between the control board and the fan motor
Stuck or binding fan blade

Solution:

1

Disconnect power to the oven at the breaker panel. Lock Out/Tag Out (LOTO) procedures MUST be followed.
2

Locate the convection fan motor, typically at the rear of the oven cavity, behind an access panel.
3

Using a multimeter, check for 120V AC at the convection fan motor terminals when the oven is set to bake mode and preheating. If no voltage is present, proceed to step 4.
4

Inspect the wiring harness connecting the control board to the convection fan motor for any damage, loose connections, or burnt wires. Repair or replace as needed.
5

Locate the convection fan relay on the control board. If possible, test the relay with a multimeter for continuity. If the relay is faulty, replace the entire control board.
6

Check the oven temperature sensor (RTD) resistance. It should read approximately 1000-1100 ohms at room temperature (70-75°F). If the resistance is significantly off, replace the RTD sensor.
7

If voltage is present at the fan motor and wiring is good, replace the convection fan motor.

Safety Warning:

Disconnect power to the oven at the breaker panel before performing any repairs. High voltage is present inside the oven. Always use proper Lock Out/Tag Out (LOTO) procedures.

Prevention:

Periodically inspect the convection fan blades for debris or obstructions. Clean as needed. Avoid overloading the oven, as this can strain the fan motor. Check for loose wiring connections during annual appliance maintenance.

Expert Tip:

Some Viking ovens have a service mode that allows you to manually activate the convection fan for testing. Consult the service manual for the specific sequence to enter service mode. Usually holding two buttons while powering up the unit.

Frequently Asked Questions

•How do I access the convection fan motor on my Viking oven?

Typically, you'll need to remove the rear panel inside the oven cavity. This usually involves removing screws securing the panel. Make sure the oven is cool and disconnected from power before proceeding.

•What is the proper resistance reading for the RTD sensor at different temperatures?

The resistance of the RTD sensor varies with temperature. A service manual for your specific model will have a resistance chart. Generally, it's around 1000-1100 ohms at room temperature (70-75°F).

•Where can I find the service manual for my Viking oven model?

You can usually find service manuals online by searching for your model number followed by 'service manual' or 'technical guide'. Viking's website might also have resources for authorized technicians.

Viking Convection Oven Fan Not Spinning in Bake Mode: Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I access the convection fan motor on my Viking oven?

•What is the proper resistance reading for the RTD sensor at different temperatures?

•Where can I find the service manual for my Viking oven model?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: