Why is the light on with no buzzer?

The buzzer may be muted or failed, but the high-level float is still signaling a problem.

Can I turn the breaker off?

No. Keep power on unless a professional instructs otherwise; the pump may need to run to lower the level.

Is it safe to wait until tomorrow?

Reduce water use immediately. If the light stays on, call a technician the same day to avoid a backup.

Septic alarm light on but no sound? What it means

A lit alarm without a buzzer usually means power to the panel is on, the visual circuit works, but the audio is muted, failed, or disconnected. Treat it as a warning: water may be high, or a float circuit needs attention.

Smell while the alarm is lit?
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Immediate actions

Do not ignore it. Silence switches may kill the buzzer; the light still signals a level issue.
Stop heavy water use. Pause laundry, dishwashers, and long showers.
Check power. Confirm the pump breaker and any GFCI are on and not tripped.

Quick diagnostics

Listen for the pump. If it runs nonstop, the outlet/field may be restricted. If it never runs, the pump or float circuit may have failed.
Inspect floats (if safe). A stuck high float can light the alarm with no sound if the buzzer is disconnected.
Check the alarm mute. Some panels have a toggle that silences the buzzer only; the light stays on.

When to call a pro immediately

Alarm light stays on after 30–60 minutes of reduced water use.
Pump won’t run or trips the breaker/GFCI.
Signs of backup or surface effluent near the tank/field.

Prevent repeat alarms

Annual float and alarm test. Have a tech lift floats to confirm both light and buzzer work.
Keep lids sealed. Reduce debris that can foul floats or wires.
Spread water loads. Avoid surge loads that outpace the pump, especially after rain.

Sources

Pump tank alarm manufacturer troubleshooting guides
EPA and state/local onsite wastewater recommendations on pump maintenance

FAQ

Why is the light on with no buzzer?: The buzzer may be muted or failed, but the high-level float is still signaling a problem.
Can I turn the breaker off?: No. Keep power on unless a pro instructs otherwise; the pump may need to run to lower the level.
Is it safe to wait until tomorrow?: Reduce water use immediately. If the light stays on, call a tech the same day to avoid a backup.