Why Does Your Range Hood Turn On by Itself? Reasons and Solutions

Blog Guides Diagnostics Maintenance and cleaning News and Technologies In the kitchen

January 20, 2025 - Updated at January 22, 2025
Tiziano B.
Diagnostics
233 views

If your range hood has gone haywire and you don’t know what to do because it turns on and off by itself, this article provides a table with all the possible causes and, most importantly, the solutions to adopt based on your specific situation.

However, remember that if you’re unable to solve the issue on your own, you can request assistance from industry professionals or seek online support. Let’s dive straight into the solutions for various scenarios—keep reading.

Possible Causes and Solutions for the Range Hood Turning On by Itself

Here are all the causes and step-by-step solutions to fix your range hood:

Problem

Solution

Humidity or Condensation

In very humid environments or when intense cooking steam is present, the range hood circuits might be affected, leading to automatic activation—especially for hoods with electronic or touch controls.

Reduce humidity in the kitchen by ensuring proper ventilation or using a dehumidifier. Clean and dry the range hood thoroughly.

Faulty Sensor

Some sensors designed to detect smoke, heat, or odors may be overly sensitive or malfunctioning, causing unintentional activation.

Check if the range hood sensor is functioning properly. If it is defective, replace it with an original spare part. If you’re unsure, contact a qualified technician for assistance.

Automatic Air Recirculation Function Activated

In many modern range hoods, an automatic function activates the extraction system when the sensor detects polluted air or an increase in airborne particles. This can also occur in the presence of strong odors or chemical vapors unrelated to cooking.

Temporarily deactivate the automatic recirculation function by following the instructions in the range hood manual.

Electrical Issues

An internal malfunction, such as a faulty switch or relay, can cause spontaneous activation.

Disconnect the range hood from the power supply and check for any signs of burning or damage on switches and relays. Replace defective components with original spare parts. If you’re not experienced, rely on a qualified technician for a safe diagnosis and repair.

Nearby Electronic Devices

Appliances or devices that emit electromagnetic waves can interfere with the range hood controls, especially if it has touch panels or advanced electronic systems.

Move any nearby electronic devices that could cause interference. Ensure the range hood is properly connected to a grounded outlet.

Electrical Line Interference

Interference can be transmitted through the electrical network, caused by voltage fluctuations or electrical noise generated by heavy appliances such as refrigerators, washing machines, or pumps.

Install a noise filter and consult an electrician to stabilize the electrical network.

Photovoltaic Systems

Solar panel systems can introduce fluctuations or disturbances in the home network, especially if the inverter is malfunctioning or the grounding is insufficient.

Have a specialized technician check the inverter and grounding of the photovoltaic system. Install a line filter to protect the range hood from fluctuations or disturbances.

Faulty Remote Control

A defective remote control can send unintentional signals that activate the range hood.

Remove the batteries from the remote and check if the problem persists. If the remote is confirmed to be faulty, replace it with an original one. Alternatively, try using the range hood without the remote to isolate the issue.

Interference from Nearby Remote Controls

Although rare, in some older range hoods, signals from other nearby remote controls (e.g., for TVs or other devices) can interfere and activate the hood. This phenomenon is more likely if the devices use similar infrared codes or radio frequencies.

Move devices with remote controls that could cause interference and check if the issue is resolved. If the range hood uses an infrared system, consider shielding the sensor or adjusting its position. If the problem persists, consult a technician.

Faulty Electronic Control Board

The electronic control board might be defective, causing spontaneous activation.

Disconnect the range hood from the power supply and visually inspect the electronic board for signs of burning or damage. If you suspect a fault, contact a qualified technician for diagnosis and, if necessary, replace the board with an original spare part.

In most cases, when this happens, the best solution is to replace the range hood's electronic control board. You can find compatible boards from many different brands on the Filtro Cappa e-commerce platform. Below, we’ll explore when it’s necessary to contact a specialized technician and whom you can turn to for assistance.

When to Contact a Specialized Technician

If, after following the tutorial and trying all the solutions listed in the table, the problem persists or you're unsure how to identify it, I recommend reaching out to an authorized service center for a thorough diagnosis—or contacting us at Filtro Cappa.

We are specialized in selling filters and spare parts for range hoods and in providing effective online assistance. As a technician with many years of experience, I can offer you online support either by phone or through the WhatsApp chat available at the bottom right of the page. I will help diagnose your issue and suggest a solution tailored to your situation.

If the issue involves faulty components in your range hood, you can purchase new parts on our website, where you’ll find filters and spare parts suitable for any range hood, even the oldest and most obsolete models.

Ho acquistato il filtro carbone della Faber ,originale, perfetto per la mia cucina. Nella confezione ce ne sono due, con un prezzo onesto. Nel sito hanno una grande varietà di prodotti per ogni esigenza. La spedizione è veloce e curata.

Marigio51

★★★★★

Ottimo servizio, ho ordinato i ricambi per una cappa FALMEC Plane 90, i ricambi arrivati sono ottimi ed originali , il servizio di spedizione è eccellente e velocissimo, il personale disponibile e molto cortese.

Paolo F.

★★★★★

Esperienza eccellente. Bisogna inviare la foto dell’etichetta del prodotto e così i pezzi di ricambio esatti vengono verificati dal venditore. Risposta attenta e rapida. Risparmio garantito rispetto ai rivenditori fisici di zona: circa 30€ a pezzo nel mio caso. Consigliatissimo!

Francesco B.

★★★★★

Consiglio vivamente, ho trovato sul sito il pezzo che mi serviva originale e a un prezzo minore rispetto ad altri siti, l'ordine è arrivato velocemente e ben impacchettato. Esperienza molto positiva

Marine P.

★★★★★

Ottimo servizio. P.S. Sono io che vi devo ringraziare, perché è molto raro trovare tanta serietà, professionalità e disponibilità, non ultimo il preoccuparsi anche dopo la consegna del parere del cliente. COMPLIMENTI.

Ermanno P.

★★★★★

Ciò che serviva a me non ce l'avevano in magazzino ma me lo hanno procurato comunque. È stato semplice e veloce. Inoltre non mi sono dovuto scervellare x capire quali delle mille mila versioni differenti serviva a me. Gli ho mandato una foto e hanno fatto tutto loro! Super professionali loro e super contento io!

Akaprovic

★★★★★

Filtro Cappa mi ha assicurato che i filtri proposti andavano bene per la mia cappa ed infatti li ho acquistati e sono felicissimo; ottima assistenza e ottimo rapporto qualità/prezzo.

Giuseppe S.

★★★★★

Prima esperienza di acquisto del filtro cappa metallico, ottima in facilità di ordine e tempi di consegna, non pensavo di trovare ancora il ricambio in quanto la cappa Faber ha 23 anni, sono estremamente soddisfatto, non escludo di acquistarne un altro da tenere di scorta quando torna disponibile sul sito

Nando F.

★★★★★

Ho trovato il filtro della mia vecchia cappa seguendo i consigli via chat che mi sono stati dati in quanto il vecchio modello non è più in produzione. La spedizione è stata velocissima e il filtro è perfetto. Grazie

Annita B.

★★★★★

Sostituzione motore ventola di aspirazione tutto ok. Il motore è arrivato imballato perfettamente confezionato onde evitare di essere sballottato e danneggiato. Montato sulla cappa airone angolare tutto ok. Rivenditore preciso e puntuale molto affidabile.

Marco V.

★★★★★