Turn off the circuit at your elect. Panel for a minute and then reset.

See if that makes the blinking go away.

If xedos suggestion doesn't work, call Customer Service at Zephyr. I had a Zephyr Typhoon for 5-6 years before I sold my house. They had absolutely the best customer service I've ever encountered! So much so, that I'm installing the same fan in the new house I'm building!

Contact info from their website:
Zephyr Ventilation
2277 Harbor Bay Parkway
Alameda, CA 94502
888.880.8368

flazoom, did you ever get a resolution on your blinking display issue? My zephyr hood just started doing the same thing.

I just had the same problem and shutting the breaker off for a few minutes reset the hood. Thanks!

This shouldn't turn the hood off - our zephyr just blinks at us after 30 hours but continues to run just fine.

Sean thanks for the tip. Worked perfectly. Also for others on here check the specs. Some of the Zephyr hoods have dishwasher safe baffle fitlers. Just pop it out and put it in the dishwasher. Good as new. Make sure you check first though.

Thanks, this just worked for our Zephyr Ravenna zrv-m90agc.

My Zephyr Milano flashes "A" -- not "F" -- during blower operation. There is no mention of this anywhere, but is it safe to assume that the filters need cleaning? Or is it something else? There's nothing in the manual about a flashing "A". The light display appears just fine so it isn't as if the pixels are misbehaving.

push the two outside buttons fro 5 seconds

I know how to disable the flashing letter but was asking what does it mean?

Thanks for the very important info regarding the flashingflashing light in the lower left corner the fix was to

HOLD THE LEFT & RIGHT up & down arrows at the same titime for 5 seconds..yeh

It worked! Thanks

Yay...it worked!!

Up and down buttons did not work for my blinking blue display with blue square on bottom left which is an indicator for a power surge. I contacted Zephyr and they provided these steps:

1. DOWN arrow and LIGHT button for 5- 7 secs.

2. The display will turn gray (off), then press POWER button twice.

Good luck!!

Thanks. This worked for mine!

Thank you; worked for me too! :)

I cleaned the hood and it started clicking noise and fan turns on by itself all the time. Any clue to stop fan and clicking noise ?

Just called Zephyr and they said this is the way the hood is "supposed to work" because it's protecting itself from power surges. What?? I've only used the hood 3 to 4 times in the 6 weeks we've lived here (new kitchen, new home) and twice it's shut itself off. Zephyr rep was very dismissive, told me to check with my contractor, it was on my end, nothing to do with them. Not impressed with their customer service at all.

This advice worked for me, "push the two outside buttons for 5 seconds"

yeah that's a temporary fix, mine keeps coming back. Sounds like a flaw in the product.

Thanks Mark, that worked!

On my hood, while the hood is off, you press the fan down arrow for 5 seconds to clear the blinking f indicator.

Ironically, an important feature of baffle filters, and why they are used in most commercial cooking hood systems, is that they continue to perform grease particulate extraction whether clean or greasy. Keeping grease from dripping from them once coated does require some slope to a point of drainage capture. For commercial systems, the slope has to be over 45 degrees, but residential systems can live with more modest slopes. With light cooking, the grease will tend to rancidify to a varnish like coating, so aesthetics dominates one's tolerable time between washings.