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?

No. ESP cells need to be removed from the unit, soaked in professional alkaline cleaning solution, and power washed. They cannot be effectively cleaned in place. The high-voltage system also requires trained technicians for any internal work.

What happens if I ignore a broken ESP?

In NYC, a non-functioning ESP is a violation of Local Law 38. The DEP can fine you $1,000-$10,000+ per violation. Additionally, your kitchen exhaust is dumping grease and smoke into the air, which triggers neighbor complaints and further inspections.

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 = Operating Normally The ESP is powered and the electrostatic field is active. Grease is being collected. You're compliant.

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 Do

1. Check the breaker — flip it off and back on. Sometimes a reset clears a temporary fault.
2. Check the access door — make sure it's fully closed and the interlock is engaged.
3. Look at the cells — if you can safely open the unit, look at the collector plates. If they're coated in thick grease, that's your problem. They need professional cleaning.
4. Check the pre-filter — a completely clogged pre-filter can restrict airflow enough to trigger faults.
5. Turn the exhaust fan on first — some ESPs have an interlock that requires the exhaust fan to be running before the ESP powers up.

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 call 311 (in NYC)
- The DEP shows up and you have no working unit and no maintenance logs
- $1,000 - $10,000 fine

A red light on your Smoke Hog is not a suggestion. It's a routine cleaning visit or a $10,000 fine. Your choice. Schedule service today.

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

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