Why is my panel buzzing?
Answer
A faint transformer hum can be normal, but loud buzzing, sizzling, or crackling from the panel is not. New or worsening panel noise can indicate loose terminations, overloaded components, or arcing that needs immediate diagnosis.
Noise that changes when heavy loads start, such as HVAC or dryers, often indicates stress at breaker or bus connections that should be corrected before damage spreads.
Why this happens
Panel buzzing is usually tied to electrical stress at key connection points.
- Loose breaker-to-bus contact or degraded lug connection.
- Sustained overload creating heat and vibration at breaker contacts.
- Aging or failing panel components approaching end of service life.
Massachusetts context
Many Massachusetts homes still run older service equipment. Internal panel repairs and replacements generally require licensed execution and may require permit and inspection.
Where older panel brands or mixed upgrade history are present, a full panel health review is usually more reliable than replacing only one noisy component.
When to call an electrician
Call when panel noise is persistent, increasing, or paired with heat, odor, or flicker.
- New buzzing that started recently or worsens under load.
- Warm breakers, burnt odor, or visible discoloration.
- Lights flicker or sensitive electronics reset with panel noise.
See Panels & Service for panel health diagnostics, or return to the homepage to route your request.