How to Fix / Troubleshooting

Safety first: Unplug before opening the unit.

Identify source: Carefully listen to locate whether the noise comes from the top (fan/heater) or control board area.
Inspect control board: Look for loose coils or transformers. Gently press with an insulated tool (with power off) to see if movement is possible; secure with appropriate high-temperature adhesive if needed.
Fan motor: If the noise changes with fan speed, the motor may be the source. Replace the fan motor if the noise is excessive.
Acceptable noise: Mild coil whine is often harmless; replace parts only if the noise is loud or accompanied by other symptoms.

Warning: Do not apply glue or sealant to hot components without ensuring it is rated for high temperature and electrical use.

Unit emits a high-pitched whine or electrical buzzing sound during operation.

Possible Causes