You can test them. Turn a zone on that you can see from the sensor...then press and hold the little spindle...the zone should go off...release and you should be good. If replacing the discs, there are 8 of them.

You can also adjust the drying rate of the discs by rotating (opening and closing) the openings of the chamber the discs are in.

You may want to try Centralpro, 2404 W. Main Street, Leesburg (352) 315-1075. They are all things Hunter, very reasonable and very helpful. I buy all of my irrigation system supplies from them.

Do we own our stuff or does it own us? Wake up, late my alarm battery is down. Go to use computer it has decided to run an antivirus or a new program install. Need an electric garage door opener-what ever happened to lifting the garage door-no big deal if you have proper counter balance springs. Oh an a standard transmission. IF, you know how to drive they last forever.

Sprinklers, they were made of metal and lasted forever. There was one, ok many plastic parts that after you laid out the hose to tell it where to go, you told it, it did not tell you, it would wrap up the hose as it went along and had a valve that would shut it off when it got to the end of they path YOU laid out.

PROGRESS? Not all progress is GOOD.

I bought a direct replacement sensor 2 years ago on eBay for $7 and replaced it in 10 minutes. They are useless anyway. CORKS! So 19th century, LOL. Got a Rachio "smart" irrigation controller (same theory as B-Hyve and others) and linked it to my Ambient weather station on my roof through Wunderground.com and it knows exactly how much rain fell and when and whether to water or not (determined by my choice of amount of precip). Was supposed to water overnight but did not because we got .25" of rain yesterday afternoon. PROGRESS CAN BE FUN!

I checked them a few months ago, but they didn't sell the cork discs.

The best solution is to replace your dumb sprinkler controller with a smart Orbit B-Hyve controller. They are sold at Home Depot, Lowe’s, and other stores. The Orbit B-Hyve controller knows about the current weather forecast, and automatically puts the controller into rain delays. The automatic rain delay is pretty accurate. Changing out the old dumb controller with the Orbit B-Hyvr controller is very easy to do after watching a YouTube video that shows the process.

I installed two 12 zone Orbit B-Hyve controllers in my former Minnesota home. Shorty after buying the Florida home, I changed out my dumb Rainbird controller with the Orbit B-Hyve controller, and I replaced the the sister in law’s dumb controller at her Florida home with the Orbit B-Hyve controller.

You can program, manually operate, and monitor your Orbit B-Hyve controller with your smart cellphone or computer. The Orbit B-Hyve controller will save you money when it automatically rain delays, which pays for the controller, then saves you money after that. It’s the least expensive smart controller, and also the best smart controller on the market.

Clean or replace the "cork" round wafers inside the roof sensor. You can buy them on eBay. That should solve the problem.

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Been in our home for 7 years now. Our Orbit sensor stopped working a few years ago - replaced the cork discs and perfect. Last month stopped again - went onto Amazon and ordered new unit. $16. The orig sensor started working again, so I have the new one now and going to replace - as a maintenance item. Simple one screw and two wires.
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Orbit 57069 Sprinkler System Hard Wired Rain and Freeze Sensor.

Amazon.com
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Unscrew top, clean top and inside, then reinstall the cap at the correct setting so it will adjust when the sprinkler system will stop at the appropriate rain level, ie 1/4 , 1/2, 3/4, inch rain level. Your may be set at something incorrect.

On mine you just unscrew the top and pop in a new cork valve. No need to replace the whole unit. I think I got one at Lowes or Home Depot. I tested mine by having the sprinklers on and pressing down on it and the sprinklers quit after a half minute or so. Good luck.

The cork (hygroscopic) discs sold at ACE Hardware are for the Hunter Mini-Clik rain sensor. But, many houses in The Villages have the Rain-Clik sensor, not the Mini-Clik. According to Hunter Industries, the Rain-Clik discs are different. The 8 discs for the Mini-Clik are all the same, but 4 of the 8 discs in the Rain-Clik sensor are "quick response" discs. Apparently, the discs sold on Ebay are the Mini-Clik discs, which will fit in the Rain-Clik sensor, but they are not the correct discs for that sensor. The Mini-Clik discs are readily available online, but the Rain-Clik discs are difficult to find. Florida Irrigation Supply in Summerfield will special order a set of the Rain-Clik discs from Hunter for $32, but they do not carry them in stock. The Hunter part number for the Rain-Clik discs and spindle is 505900. Hunter will not sell parts directly to the public.

Got a b-hyve from Amazon last year and so happy to have it. We're snowbirds so it makes life so easy. Works with existing rain sensor as well as predictive schedule pause due to forecast rain

Take your garden hose and spray it up in the air and let it come down in the sensor. Check the control box and see if it shows being off. If not, replace or repair the sensor.

As a couple people have mentioned, you should see the "on/off" readout with the
 

As a couple people have mentioned, you should see the "on/off" readout with the switch activated. Replaced mine last year. Top of the outside sensor just pops off and you can remove the washer assembly. Central Pro sells the complete replacement "kit"....washers, screw, etc already assembled for about $5. Ready to drop right in.
Central Pro, 2404 W. Main, Leesburg....352-315-1075