How a hood keypad speaks
Unlike an oven, most hoods have no text display at all. Simple models use a row of backlit keys, mid-range ones add a single-digit window for the speed, and a few premium hoods show icons or short codes. The same blink can mean different things on two brands, so the first job is to note exactly which key or symbol is lit, whether it is steady or blinking, and when it happens: while the fan runs, only after it stops, or as soon as power returns.
Keep the owner's manual for your model close, or find it by the model number on the label behind the filters. The range hood indicator lights described below come from published manuals and are typical, but your hood's manual is the final word on what each one means.
Filter reminders
The most common blinking light on any hood is a maintenance timer. It counts how long the fan has run and asks for the filters once a set number of hours has passed, whether or not they are actually dirty.
- Blinks only after the fan stops: almost always a filter reminder.
- Letter in the speed window during a run: check the manual for a reminder letter first.
- Returns immediately after a correct reset: a control board question for the visit.
Mesh and baffle filter reminder
Zephyr's Firenze flashes a letter in its display after every 30 hours of fan use as a signal to clean the metal filters. Its own manual calls that letter F on one page and A on another, which is a good reason to read reminders by their timing rather than by the exact character. Broan's BQLA1 series uses a dedicated filter key that blinks for 30 seconds after the blower is switched off.
Charcoal filter reminder
On a hood set up to recirculate, a second timer asks for new charcoal filters. The Firenze shows a flashing C after 120 hours of use, and only once the owner has switched that timer on with a five-second hold while the hood is off; Zephyr is clear that charcoal filters are replaced and never washed or put in a dishwasher.
Resetting after the filters are done
A reminder does not know the filters were cleaned; you have to tell it. Broan's method is to hold the blinking filter key for three seconds while it is still blinking. Zephyr's is to hold the key for about five seconds with the hood off until the letter disappears. If the reminder comes straight back after a correct reset, write that down for the technician.
Timers and heat protection
A blinking speed key, or a dot in the corner of the display, usually means a delayed shut-off is counting down. On Broan's BQLA1 series the lit speed key blinks for the ten minutes the fan keeps running; on Zephyr's Firenze a dot flashes for fifteen. When the time runs out the fan stops and the blinking ends.
When every blower key blinks at once on the BQLA1 series, the heat sensor has taken over. The fan is held on medium while the canopy is hot and goes back to your chosen speed when the heat drops; a faster blink with both fan and lights off means the heat was extreme, and the hood waits to cool before running again. Neither pattern needs a reset from you.
- One key blinking, fan running after you pressed off: delay-off.
- All blower keys blinking, fan stuck on medium: heat protection.
- All keys blinking fast, fan and lights off: extreme heat; turn the burners down and wait.
Source: Zephyr — Firenze ZFI-M90S use, care and installation guide — A letter flashes after every 30 hours of use to clean the metal filters (F on page 13, A on page 14); C flashes after 120 hours when the charcoal timer is switched on by a 5-second hold with the hood off; charcoal filters are never cleaned or put in a dishwasher; reset by holding about 5 seconds with the hood off; delay off runs 15 minutes with a flashing dot; Broan-NuTone — BQLA1 and NQLA1 range hood installation, use and care manual — The filter reminder blinks for 30 seconds after the blower is turned off and resets with a 3-second hold while blinking; the active speed key blinks during the 10-minute delay-off; Heat Sentry holds medium speed with all blower sensors blinking, and shuts blower and lights off with a faster blink on excessive heat; an external light source can falsely activate the light-sensitive control
Codes, dead keys and a panel that lights at random
A few hoods do show service codes, usually letters and numbers about the blower, a sensor or the board. We do not guess at those here: our error codes pages list the ones makers have published, with what each means. If a code appears, photograph it, try one breaker reset of a full minute, and see whether it comes back.
A panel with no lights at all while the breaker is on, keys that light but do nothing, or lights that come on in the middle of the night are control problems rather than messages. Broan notes that one of its touch controls can be falsely triggered by a strong light aimed at it, so rule out a new spotlight before booking, but after that the switch or the board is the suspect.
Source: Broan-NuTone — BQLA1 and NQLA1 range hood installation, use and care manual — The filter reminder blinks for 30 seconds after the blower is turned off and resets with a 3-second hold while blinking; the active speed key blinks during the 10-minute delay-off; Heat Sentry holds medium speed with all blower sensors blinking, and shuts blower and lights off with a faster blink on excessive heat; an external light source can falsely activate the light-sensitive control
What to note from the panel
A photograph beats a description. Take one of the panel as it is, and a short video if something blinks, so the blink rate is recorded. Add which speeds and lights still respond, whether the filters were cleaned recently, whether the hood vents outside or recirculates, and whether the pattern began after a power cut or a very hot session on the burners.
