Why is my Smoke Hog showing a red light?

A red indicator light means the ESP has detected a fault and shut down. The most common cause is dirty collector cells causing electrical arcing. Other causes include a broken ionizer wire, power supply fault, or open safety interlock. The cells need professional cleaning.

Can I clean my ESP cells myself?

Follow the equipment manufacturer's instructions and the site's lockout procedure. ESP systems contain high-voltage components, and internal diagnosis or cell removal should be handled only by personnel trained for that equipment and task.

What happens if I ignore a broken ESP?

A non-functioning ESP may allow more smoke, grease aerosol, or odor to leave the exhaust system and can lead to complaints or enforcement attention. Record the fault and arrange diagnosis rather than relying on the indicator light alone.

Smoke Hog Not Working? Troubleshooting Your Kitchen ESP

"Smoke Hog" has become the generic name for kitchen electrostatic precipitators, like "Kleenex" for tissues. Whether you have an actual Smoke Hog (now Parker Hannifin / Filtration Group), a CaptiveAire ESP, an Ecology unit, or another brand: here's how to troubleshoot when it stops working.

Check the Indicator Light First

Green Light = The Control Reports Normal Operation A green indicator typically means the unit is powered and the control is not reporting a fault. Indicator behavior varies by manufacturer, and a light alone does not prove airflow, collection performance, or code compliance.

Red Light = Problem Detected The unit has shut itself off due to a detected fault. Common causes: - Dirty cells: grease buildup is causing arcing (electrical shorts between plates). This is the #1 cause. The cells need cleaning. - Failed ionizer wire: a broken wire disrupts the electrostatic field. The safety circuit shuts the unit down. - Power supply fault: the high-voltage transformer has failed or is overheating. - Interlock open: the access door is open or a safety switch has tripped.

No Light at All = No Power - Check the breaker/disconnect switch - Check if the unit is interlocked with the exhaust fan (some units won't power on unless the fan is running) - The power supply may have failed completely

What You Can Check Safely

1. Record the indicator and fault information: take a clear photo before resetting anything.
2. Confirm the exhaust fan is running: some systems require fan proof before the pollution-control unit can enable.
3. Check whether a normal cleaning or maintenance visit was recently completed: contamination and reassembly issues are common fault causes.
4. Call for service before opening internal high-voltage sections: follow the manufacturer instructions and site lockout procedure.

What Requires a Technician

Cell cleaning: the cells need to be removed, soaked, and power washed. You can't clean them in place.
Ionizer wire replacement: these are delicate tungsten wires inside a high-voltage system. Not a DIY job.
Power supply repair: high-voltage electrical work. Dangerous without training.
Control board replacement: if the logic board has failed, it needs professional diagnosis.

Don't Ignore It

A non-functioning ESP means:
- Your kitchen exhaust is dumping grease and smoke directly into the air
- Neighbors smell it and file complaints
- The system may not be meeting its intended emissions-control function
- The site may need service records and operating evidence for an inspection or complaint response

A red light or recurring trip deserves diagnosis. Record the condition and request service rather than assuming the problem is only dirty cells.

Need ESP service? Visit our Pollution Control Service page or schedule service today.