Grinder pump alarm going off: what to do now
Short answer
Stop using water and leave the panel closed. A flashing red alarm on the Keen station documented by BCSS signals high wastewater: call BCSS promptly. Gulf Shores Utilities wants a call at any red alarm.
A grinder pump alarm can signal high wastewater in the basin. The panel may also have separate fault lights. Stop using water, leave the panel and basin closed, and check the label or call the utility for the next step.
This page is for the first alarm. If yours comes back again and again, read the page on an alarm that keeps going off instead.
Safe steps, in order
Nothing here opens the panel or the basin. If a step does not clear it, stop and make the call.
Step 1: Stop using water
No flushing, laundry, dishwasher or showers. Everything that goes down a drain lands in the basin that is already too full. Keen's user guide warns that continued use during an alarm can cause a plumbing blockage.
Step 2: Silence the horn at the button
If it is safe to approach and there is a clearly marked external silence button, you can quiet the horn. It does not clear the alarm. Leave the cover on.
Step 3: Call your utility first if it asks
For the high-water flash on a documented BCSS Keen station, call (251) 971-3022 promptly. If Gulf Shores Utilities sends your sewer bill, report any red alarm at (251) 968-6323.
Step 4: Follow the timing for your system
The E/One owner guide describes waiting up to an hour for its documented alarm when the utility has no earlier instruction and there is no backup or overflow. That timing does not apply to every panel.
Step 5: Call if the alarm persists or returns
Contact whoever services your station. For a backup, overflow, smoke or sparks, act now and use the emergency guidance.
What the alarm is actually telling you
Every grinder station has a high-level sensor set above the normal pump-on level. When sewage reaches it, the panel turns on the light and horn. On E-One stations the alarm circuit also engages a redundant pump start, so the pump gets a second command to run. The light stays lit until the level drops back below the alarm switch's off point, which is why silencing the horn never turns the light off.
So the alarm is a level warning, not a diagnosis. The pump may have lost power, tripped its breaker or overload, jammed on something, lost its level signal, or be running but unable to push against a closed valve or stuck check valve. More rarely, the house simply sent more water than the pump could move at once.
Likely causes, in order
The utility and manufacturer guides describe several reasons a station may alarm.
- Lost power or a tripped breaker at the house panel. E-One, Keen and Barnes all say the pump cannot move wastewater without power. Keen adds that a tripped motor overload resets itself in 20 to 30 minutes.
- Heavy rain or ground water entering the basin. E-One: an alarm when it rains means rainwater may be getting into the system and overloading it. Keen puts ground water in the basin on its frequent-cycling list.
- A jammed or partly clogged grinder. Keen names solids lodged in the inlet; Myers pairs a high-water alarm with a tripped overload when the grinder is clogged.
- A level sensor or float problem. Keen: a float switch that is defective or restricted. BCSS: level sensors can collect enough grease to stop the station.
- Pump running but not moving water: air lock, a closed discharge valve, or a check valve stuck or installed backwards (Keen, Myers, Liberty).
- Water use beyond what the pump can handle at once, for example several fixtures draining together. This one usually clears itself.
What the panel looks and sounds like, by brand
E-One: a red oblong lens on top of the enclosure and a horn on the bottom, 93 decibels at two feet, with a push-type silence switch. Sentry panels add four indicators: Ready, Pump Running, Trouble and High Level Alarm. The Trouble light covers brown-out, run-dry, over-pressure and run-time limit, which are different from a high-level alarm.
Keen (the pump BCSS installs): an amber light for pump running, a red alarm light paired with the horn, and a toggle on the outside of the box: up tests, down silences. The BCSS user guide describes the alarm as a visual flashing red light whenever the tank level is higher than normal.
Liberty and Zoeller systems are usually paired with a separate alarm box rather than a full control panel. Liberty's manual cites the Uniform Plumbing Code: sewage systems shall have an audio and visual alarm signaling a malfunction.
How long you have
E-One gives its stations a 24-hour emergency storage capacity, depending on water usage, and says repairs should be carried out within that period. MAWSS tells Mobile customers most tanks hold about a day of normal flow. A BCSS Keen station is a 24-inch by 60-inch tank. In practice a family that keeps flushing uses that cushion in a few hours; a family that stops uses almost none of it.
What we check on site
Technician work, in the order it is usually done.
- Supply voltage and the breaker, then running current (E-One's healthy range is 5 to 8 amps on 240 volts); a reading near locked-rotor current points to a jammed cutter.
- Level controls: pressure switches on E-One, floats on Keen, Liberty, Zoeller and Barnes, including grease on the float stems and whether a float has moved.
- Start components on single-phase pumps (capacitors and relay) and the overload.
- The check valve and any discharge valve, for a valve closed at the station or the street and a check valve stuck or reversed.
- The grinder itself for wipes, rags, floss and grease, and the seal-leak circuit on dual-seal pumps.
- Where the basin collects ground water, the lid seal and inlet for rain entry.
After a power outage
E-One says the alarm may sound until the unit clears itself once power is back, and to call for service if it is still on more than an hour after power is restored. Do not disconnect power to an E-One unit to stop the alarm; the owners guide allows that only for a broken discharge pipe. Keen and Barnes both warn that without power the pump can neither pump nor sound an alarm, so a silent panel during an outage is not good news, it is no news.
When this is an emergency
If sewage is coming out of a drain or surfacing near the basin, keep away from it and call for help immediately. If the enclosure is smoking or sparking, move away and call 911.
Still not right? Ask from here
Your name, a way to reach you and what the pump is doing. That is all we need to start. Town and utility are optional.
Sewage backing up or overflowing? Stop using water and call now: (251) 850-8031. On a utility-owned pump, call your utility first.
Questions people ask
What does a grinder pump alarm sound like?
A steady horn or buzzer from the outdoor panel, with a red light. E-One's horn is on the underside of the panel and is specified at 93 decibels at two feet. Keen panels pair the horn with a flashing red light. Pumps BCSS installed after July 15, 2010 have no audible alarm at all, only the light.
What causes a grinder pump alarm to go off?
High sewage level in the basin. Behind that: lost power, a tripped breaker or overload, a jammed grinder, a float or level sensor that failed or is coated in grease, a stuck check valve or closed valve, rainwater getting in, or a burst of water use the pump could not keep up with.
Why is my grinder pump beeping instead of blaring?
Some alarm boxes chirp rather than sound a continuous horn, and a horn can also sound intermittent when the level hovers around the alarm switch. Treat any sound from the panel as the high-level alarm until a technician says otherwise.
Is a grinder pump alarm the same as a septic tank alarm?
No. A septic alarm box monitors a pump tank on a septic system. This site covers grinder pumps, sewage ejector pumps and lift stations on sewer systems. The safe first steps overlap (stop water, silence, call), but the service goes to whoever maintains that septic system.
A neighbor's grinder alarm is sounding and nobody is home. What do I do?
E-One's guidance is to call the service number and not to investigate yourself. If the home is on BCSS or Gulf Shores Utilities, the utility's line is the right call.
Does the alarm mean my pump is broken?
A cleared alarm does not establish that the pump is broken or working normally. Follow your utility’s rule: Gulf Shores Utilities wants a call even if a red alarm clears. Report recurring alarms, and call for help immediately if sewage backs up or spills.
Sources and facts
- E-One owners guide p.5, Alarm Going Off: press the button under the alarm panel to silence (light stays lit), limit water usage; wait an hour; if light still on call the service number. If the light goes off, no further action required. E/One Owners Guide (LM000403 Rev G), eone.com/… (read 2026-11-04)
- E-One D-Series spec section 2.12: when level rises above alarm level, audible and visual alarms activate and the redundant pump start engages; audible alarm silenced with the external push-to-silence button; visual alarm stays lit until level drops below the alarm switch off setting; red oblong lens on top, horn on bottom, 93 dB at 2 ft. E/One D-Series specification, eone.com/images/files/d-series-spec.pdf (read 2026-11-04)
- E-One owners guide p.5: 24-hour emergency storage capacity depending on water usage; repairs should be carried out within that period. E/One Owners Guide (LM000403 Rev G), eone.com/… (read 2026-11-04)
- E-One owners guide p.6: alarm when it rains means rainwater may be getting into the system and overloading it; after a power failure the alarm may activate until the unit clears itself; call if still on more than an hour after power is restored. E/One Owners Guide (LM000403 Rev G), eone.com/… (read 2026-11-04)
- E-One user instructions p.15 and owners guide p.4, p.6: do not disconnect power to the unit; the only case for turning off pump power is a broken discharge pipe. E/One DH071 Installation Instructions incl. User Instructions (NA0061P01 Rev H), eone.com/…; E/One Owners Guide (LM000403 Rev G), eone.com/… (read 2026-11-04)
- E-One installation instructions p.8: running current between 5 and 8 amps on 240 VAC. E/One DH071 Installation Instructions incl. User Instructions (NA0061P01 Rev H), eone.com/… (read 2026-11-04)
- E-One Sentry brochure p.1: Ready, Pump Running, Trouble and High Level Alarm indicators; trouble covers brown-out, run-dry, over-pressure, run-time limit. E/One Sentry Alarm Panels brochure (LM000323 Rev H), eone.com/… (read 2026-11-04)
- Keen control panel O&M p.2-4: Hand-Off-Auto switch, amber pump-run light, alarm light plus horn, outside toggle tests (up) or silences (down) leaving the light on. Keen Pump General O&M, Control Panel, keenpump.com/… (read 2026-11-04)
- Keen O&M p.9: won't run causes include tripped breaker, power interruption, float switch defective or restricted, start capacitors, motor overload tripped (resets in 20-30 minutes), solids lodged in inlet; cycles frequently: check valve stuck or backwards, ground water entering basin, leaking fixtures, floats moved. Keen Pump O&M-KPCG (May 2022), keenpump.com/… (read 2026-11-04)
- BCSS Keen user guide p.13-14: visual flashing red light whenever tank level is higher than normal; stop water use immediately and call your utility provider; continued use can cause a plumbing blockage; pump cannot pump or alarm without power; level sensors may need cleaning if grease obstructs them. Station tank 24 in by 60 in (p.1). BCSS-distributed Keen KPCGSL21 grinder station manual, www.baldwincountysewer.com/… (read 2026-11-04)
- Myers manual p.8: overload trips with a high-water alarm may be a clogged grinder, failed motor or control box fault; p.8: runs but no pumping includes check valve flapper stuck, valve at street off, redundant check valve backwards. Pentair Myers WG(X)20 owner's manual 23833A744, www.pentair.com/… (read 2026-11-04)
- Liberty PRG manual p.3 cites the Uniform Plumbing Code: sewage systems shall have an audio and visual alarm signaling a malfunction; p.10: check valve stuck or backwards, valve closed. Liberty Pumps ProVore PRG-Series installation manual 2399000, www.libertypumps.com/… (read 2026-11-04)
- Barnes OGV manual p.3: pump cannot dispose of wastewater or provide an alarm signal without power. Barnes OGVF/OGVH installation manual (Form 108890 Rev X), d1pkofokfruj4.cloudfront.net/… (read 2026-11-04)
- BCSS FAQ: if the alarm goes off for over 15 minutes, you can try to troubleshoot or contact us for service at (251) 971-3022 or a plumber to schedule a repair. BCSS Grinder Pump FAQs, www.baldwincountysewer.com/… (read 2026-11-04)
- GSU: any time a resident sees the red light on, even for a few seconds, they should contact the Board, including after hours and on weekends; GSU phone (251) 968-6323. Gulf Shores Utilities grinder pump page, www.gulfshoresutilities.com/grinder-pump (read 2026-11-04)
- BCSS User Tips: pumps installed by BCSS after 2010-07-15 have no audible alarm. BCSS User Tips, www.baldwincountysewer.com/… (read 2026-11-04)
- MAWSS hurricane page: most tanks hold about 24 hours of normal flow. MAWSS Hurricane Preparation, www.mawss.com/… (read 2026-11-04)