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Solving Honeywell WiFi Thermostat Connection Problems

Picture of the Honeywell RTH9580WF thermostat, displaying the Select WiFi Network screen, with the Other... option highlighted.

This piece explores fixing Honeywell WiFi thermostat connection issues, as skilled on our Honeywell RTH9580WF web managed thermostat, though this info applies about as nicely to Honeywell’s different wi-fi thermostats, together with the RTH8580WF, VisionPRO TH8320WF, VisionPRO 8000, et al.

Fixing Honeywell WiFi Thermostat Connection Issues

By this, we imply that the thermostat won’t hook up with your house Wi-Fi community. It might or might not have been capable of join prior. Typical causes for this sort of failure to attach are listed subsequent.

1.1 Wi-Fi Community Not Present in Scan


Your wi-fi community doesn’t present up within the record of in-range networks that the thermostat discovers throughout a Wi-Fi scan throughout preliminary setup.


Make certain your wi-fi router is powered up and that your WiFi SSID is just not hidden (being broadcast).  Most routers broadcast the community identify SSID by default.  However you’ll have purposely hid your SSID for safety functions.  In that case, then your community won’t seem within the in-range networks record when the thermostat scans for obtainable networks.  So that you’ll need to enter your community identify manually in addition to the safety protocols it makes use of (WPA, WEP, WPAT, TKP, AES, …).

For hidden WiFi networks, many Honeywell sensible thermostats have an  Different  button. Use this button to cowl the case the place your community doesn’t seem within the listing.  If you press that, the t-stat prompts you to enter your community particulars as mentioned.  Watch out to keep away from typos although.  A improper community identify, password, authentication, or encryption protocol entered right here will forestall your thermostat from connecting.

Picture of the Honeywell RTH9580WF thermostat, displaying the Select WiFi Network screen, with the Other... option highlighted.Honeywell RTH9580WF thermostat, displaying the Choose WiFi Community display, with the Different… choice highlighted. Fixing Honeywell WiFi thermostat connection issues.

1.2 Wi-Fi Community Parameters have Modified


That’s, the entry level password, community identify, or community safety settings might have modified.  This typically occurs once you purchase a brand new router.  Until you program set it up with the identical community info, a brand new router virtually definitely will use a unique SSID and password.


Collect your right Wi-Fi community identify and password.  Then arrange the thermostat to hook up with that wi-fi community.

Some thermostats want a tough reset to vary the wi-fi community that they struggle to hook up with upon begin up, such because the RTH8580WF does.  However others, such because the RTH9580WF pictured subsequent, will let you go in and modify the community settings with no manufacturing unit default reset.

Picture of a Honeywell Wi-Fi touchscreen thermostat, with the Wi-Fi setup option highlighted.Honeywell Wi-Fi touchscreen thermostat, with the Wi-Fi setup choice highlighted. Fixing Honeywell WiFi thermostat connection issues.

1.three Router Wants a Reboot


Your wi-fi router might have acquired an replace, skilled an influence surge, or caught a firmware bug.  These gotchas might corrupt the RAM within the router.  Thus, they will intrude with the way it responds to connection requests from Wi-Fi based mostly home equipment, just like the Honeywell wi-fi thermostat.

Picture of the Asus RT-AC87R Wireless Router, Front View, Installed and Operating on office desk.Asus RT-AC87R Wifi Router, entrance view, put in and working.  Fixing Honeywell WiFi thermostat connection issues.


Restarting the router clears out working reminiscence, and permits the router to start out once more from a known-clean level.  Rebooting a router / entry level typically restores correct router operation.

1.four Interference Degrading the WiFi Connection


Most Honeywell wi-fi thermostats talk utilizing the 802.11g Wi-Fi commonplace.  Transmissions like this happen within the 2.four Ghz. frequency vary.  Now 2.four Ghz. can also be a well-liked frequency band for a lot of units.  These embrace different Wi-Fi networks in addition to non Wi-Fi units corresponding to cordless telephones, microwave ovens, child screens, Bluetooth audio system, and residential theater system distant controls.  There’s a whole lot of visitors in that band thus.  That’s fairly so in crowded condo buildings or intently spaced housing.  So at times, your Honeywell thermostat might fail to attach or to take care of connection together with your router as a consequence of this interference.


Remove the supply of the interference if attainable. For starters, attempt turning off any cordless telephones in your home and see if the issue goes away.  In that case, exchange your telephones (together with the bottom unit) with a wi-fi telephone that operates on totally different frequencies than 2.four Ghz.  Most of the newer wi-fi telephones function within the 1.9 Ghz. band.  They design these to not intrude with WiFi communications.  However don’t purchase one in the event you’re unsure what frequencies it really works on.

Do equally with different wi-fi units as properly.  Attempt turning all of them off and see if the issue disappears.  Then, flip them every again on, one after the other, and observe the response of the thermostat after every.  If the thermostat connection goes bonkers after you energy up a specific system, then that’s doubtless the one inflicting the interference.  Attempt shifting this equipment additional away from the thermostat and router.

Reposition your router nearer to the thermostat.

1.5 Thermostat Too Far Away out of your Wi-fi Router

Picture of the Honeywell RTH9580WF thermostat on same wall as a typical fridge freezer thermometer, used for thermostat temperature calibration.Calibrating Honeywell RTH9580WF thermostat temperature, utilizing a fridge freezer thermometer, with Each on similar wall.  Fixing Honeywell WiFi thermostat connection issues.


Although the sign power of the Wi-Fi community may present as full power, profitable connection should fail.  This is because of multi path alerts between your router and thermostat and / or interference from close by digital units.


Transfer the router nearer to the thermostat.

Or, attempt the options in drawback 1.four above.

1.6 Faulty or Mis Configured Router / Entry Level


Examine this by making an attempt to hook up with your wi-fi router with one other Wi-Fi gadget.  Do this with a pill, cell phone, laptop computer, or perhaps a desktop pc by way of Wi-Fi.  Now if these shoppers fail to join, however did join earlier than this thermostat outage occurred, then attempt the next.


Attempt resetting your Wi-Fi enabled router to manufacturing unit defaults,.  Then, when it comes again up, make the wanted tweaks to it to fill your community wants.  Lastly, attempt once more to attach the thermostat.

If that measure fails, change to a unique router.  That’s not too costly lately.  Certainly, routers like people who meet minimal speeds of Honeywell wi-fi thermostats, are fairly low cost (beneath $40), and dependable.  Examine round for them on eBay.  Now Honeywell wi-fi thermostats want little web bandwidth. So usually they work very properly with even the most cost effective wi-fi routers.

1.7 Damaged Thermostat

Picture of the Honeywell RTH9580WF Internet Thermostat, mounted but powered down, snapped onto wall plate.Honeywell RTH9580WF Web Thermostat, mounted however powered down, snapped onto wall plate. Fixing Honeywell WiFi thermostat connection issues.


If not one of the above fixes solves the issue, you might have a faulty thermostat.  Certainly, over time, most digital elements like these within the Wi-Fi radio within the thermostat, weaken and fail to carry out in addition to they did when new.  The transmission energy of the thermostat might fall to such a low worth that its sign can not attain the router.  Wi-fi thermostat elements are notably topic to this type of put on, because the thermostat maintains fixed (24 X 7) contact with the Honeywell Complete Join Consolation  servers by way of the web.


Substitute the thermostat.  Attempt a special Honeywell wi-fi thermostat.  Like wi-fi entry level electronics, thermostats do age too.  For those who’re thermostat is various years previous, it’s in all probability time to exchange / improve it anyhow, particularly if it’s inflicting points.

1.eight Faulty Furnace


Your furnace provides 24 volts AC to most wi-fi thermostats, by way of an inner energy provide.  This power reaches the t-stat by way of the connecting wiring from the furnace to thermostat.  If this AC provide turns into intermittent, noisy, drops or raises in voltage lots, then the thermostat typically fails.


Verify that the AC voltage on the thermostat terminals is 24 volts AC, plus or minus ten %. If not, name a furnace restore technician, and have her troubleshoot your furnace and restore its energy circuitry.

Fixing Honeywell WiFi Thermostat Connection Issues – Thermostat Retains Dropping Connection

Contemplate the next options in case your Honeywell wi-fi thermostat is in a position to hook up with your house Wi-Fi community, however ceaselessly loses that connection for the varied causes mentioned on this part.

Picture of the Honeywell wireless thermostat, displaying its -Lost Wi-Fi Signal- message.Honeywell wi-fi thermostat, displaying its -Misplaced Wi-Fi Sign- message. Fixing Honeywell WiFi thermostat connection issues.

2.1 Web service Briefly Unavailable


Attempt accessing the web by way of one other system on the identical Wi-Fi community as your thermostat.  If they don’t work both, then notify your web service supplier about the issue, and await service to return.

2.2 E02 and E43 Error Messages 

Some Honeywell thermostats show these errors when the Wi-Fi connection has been misplaced or can’t be initiated because of the causes mentioned above. 


Execute gadgets within the first main part above to troubleshoot this drawback.

2.three Router Misplaced Energy

Maybe your wi-fi router has been disconnected from mains energy.


Confirm that the router has energy and is up and operating, by executing gadgets 1. above.

2.four Modem Misplaced Energy


In some installations, the cable / DSL modem and router entry level aren’t in the identical field.  But all of those elements have to be powered up and functioning correctly to ensure that your thermostat to determine a profitable web reference to the Honeywell infrastructure servers.


Verify the standing lamps on the modem, router, and wi-fi entry level to confirm right modem perform.  Any purple or blinking lights might point out an issue.

Examine you can hook up with your community with different wi-fi units, as described in gadgets 2.1 above.

2.5 Honeywell Complete Join Consolation Servers could also be Offline

Picture of the Honeywell Total Connect Comfort web site, displaying its login page, with active account info filled in.Honeywell Complete Join Consolation website, displaying its login web page, with lively account information crammed in. Fixing Honeywell WiFi thermostat connection issues.


Typically, they take down Honeywell Complete Join Consolation servers for upkeep or upgrades.  Or, your personal web connection might have gone down because of storms and energy outages in your space.  There could possibly be downed wires, exterior gear failures, and so forth.  Whereas your thermostat might efficiently hook up with your Wi-Fi entry level, it nonetheless might present an error message just like that within the orange space within the subsequent image.

Picture of the Honeywell wireless thermostat, displaying its -Lost Wi-Fi Signal- message.Honeywell wi-fi thermostat, displaying its -Misplaced Wi-Fi Sign- message. Fixing Honeywell WiFi thermostat connection issues.


Wait a couple of hours for the Honeywell servers to be introduced again on-line.

2.6 Wi-Fi Channel Too Busy


Most routers usually broadcast on wi-fi community channels 1, 6, or 11.  It might be that the channel your community is utilizing is very congested by neighbors’ networks.


Change your router’s Wi-Fi channel.  To try this, log into the router’s admin pages.  Additionally, keep in mind that the router will probably reboot after you apply the change.  Attempt channels 1, 6, or 11, and see if the misplaced web connection drawback persists.  In case you have entry to an Android pill or telephone, you possibly can attempt Ampd’s Wi-Fi Analyzer to see which of those channels has the least visitors.

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Revision Historical past

  • 2017-01-29: Initially revealed.

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