Viking Cooktop Surface Unit Humming Noise: Troubleshootin... | appliancefaults.com

Technical Background:

Viking cooktops utilize a Main Control Unit (MCU) to manage power distribution to the surface elements. The infinite switch, in conjunction with the MCU, regulates the voltage supplied to the element, controlling the heat output. A humming noise often indicates an unstable voltage or current flow within this system.

Symptoms:

The homeowner reports a humming noise emanating from a Viking cooktop surface unit, even when set to a low or off position. The surface unit may or may not be heating effectively.

Possible Causes:

Loose burner connection
Faulty infinite switch
Defective surface element
Control board malfunction
Wiring issues

Solution:

1

Disconnect power at the breaker panel. Verify 0V AC at the cooktop receptacle using a multimeter.
2

Remove the cooktop surface and inspect the burner connection for tightness and corrosion. Clean connections with a wire brush.
3

Using a multimeter, test the surface element for continuity. An open circuit indicates a failed element. Replace if necessary.
4

Inspect the infinite switch for physical damage. Use a multimeter to check the switch's resistance across its terminals in different settings. Replace if faulty.
5

Examine the wiring harness for loose connections or damaged insulation. Repair or replace as needed.
6

If the above steps don't resolve the issue, suspect a control board problem. Visual inspection for burned components is important. Consider licensed technician control board testing or replacement.
7

Restore power and retest the cooktop surface unit.

Safety Warning:

Lock Out/Tag Out (LOTO) the breaker before working on any electrical components. High voltage is present in the cooktop, potentially causing serious injury or death. Always use caution and proper safety equipment.

Prevention:

Regularly clean around the burners to prevent food debris from interfering with connections. Avoid using excessive force when turning the control knobs. Have a qualified technician inspect the cooktop annually.

Expert Tip:

Viking cooktops often have a hidden service mode that can provide diagnostic information. Consult the service manual for the specific sequence for your model. This may involve pressing and holding specific buttons while powering on the unit.

Follow-up Questions:

Frequently Asked Questions

•How do I safely test the infinite switch with a multimeter?

Disconnect power. Remove the switch. Set your multimeter to ohms (resistance). Test across each terminal pair as you rotate the switch through its settings. Resistance should change smoothly without any opens or shorts.

•What is the typical resistance reading I should expect from a working surface element?

The resistance of a surface element varies depending on its wattage. A typical 1200W element might read around 10-12 ohms. Always refer to the manufacturer's specifications if available.

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

You can often find service manuals online through appliance parts retailers or manufacturer websites. Search using your specific model number. Alternatively, you can contact Viking directly.

Viking Cooktop Surface Unit Humming Noise: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I safely test the infinite switch with a multimeter?

•What is the typical resistance reading I should expect from a working surface element?

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

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: