Honeywell Heating & Cooling - Recent Questions, Troubleshooting & Support

Honeywell has the manuals for most of their thermostats on their web site. Start here, , for the Smart thermostats.

The E43 error indicates that the thermostat can't communicate with the router. Make sure that the router can communicate with your WAN (wide area network). Check the power and that the Ethernet cable is plugged in and undamaged. Reboot the router (unplug it and wait before plugging in the power cord). If you recently changed the password or the router SSID (the name of the network that the unit uses in its communication), try resetting the internet connection. Similarly, if you have a new router, reset the connection. Make sure that you know the SSID, password and encryption for the router.

I've checked the directions to do this on the Focus Pro TH6320WF series. Press More on the thermostat for 3+ seconds until the screen displays two numbers and the button labels are Done, Back and Next. Press Next until the larger number on the left of the display shows 39. Use the Up/Down arrows to change this to 0. Press Done. Take another Wi-Fi enabled device (tablet, cell phone, laptop) and set it to look for other available networks. Find the network with Thermostat in the name and connect to that network temporarily. If you see a prompt about the type of network, call this a Home Network. Open your web browser and go to the thermostat's Wi-Fi set-up page. (If needed, navigate to .) Find your router's home network's name in the list of available networks. Press Rescan if the SSID is being broadcast but doesn't appear in the list. If the router does not broadcast the SSID, enter the router name in the text box. Enter the encryption mode for the router. Follow the on-screen directions and press the Connect button. Enter the router password when prompted for the information. Wait to see the Wi-Fi Setup Connection Success in the display. If it doesn't check if the password was correctly entered, including special characters.

I hope this helps. The manual for the Focus Pro thermostat is here: .

Cindy Wells

Honeywell... | Answered Yesterday

I have exactly the same problem, did you ever get an answer to this issue?

Honeywell... | Answered on Jul 07, 2018

First be sure the hole in the wall behind the tstat is sealed with putty or the like. This could be your issue due to negative pressure in the house. What you are describing may be something different, the unit should eventually catch up and satisfy if it was working properly. The house would just be cooler. There is a calibration feature that can change the room temp +/- 5 degrees but seal the whole and measure the return air temp vs the supply air temp AT the unit, NOT the grills.

Honeywell... | Answered on Jul 01, 2018

call Honeywell. it looks like this is a line voltage thermostat not a standard low voltage HVAC thermostat. Good luck

Honeywell... | Answered on Jun 25, 2018

When did it last work? The first thing I would do is turn off the breaker that powers the A/C system. If it's a central system there are probably two 2-pole breakers (outside unit and air handler) turn them off, wait a few minutes and turn them back on. Let the system re-set (compressor time-out is at least 5 minutes after turning it back on. After the system is reset, see if your thermostat is working correctly and if not, try this link for an overview of Honeywell troubleshooting. Honeywell Thermostat Troubleshooting Six Step Guide

Honeywell... | Answered on Jun 24, 2018

press system/fan. press and hold fan until screen changes. scroll down to option 530. 1 is on 0 is off. This disables recovery, disables your machine from having your house AT the desired set point temp AT the programmed time rather than the machine beginning to accomplish set point temp at the programmed time.

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Honeywell... | Answered on Jun 24, 2018

Your Honeywell thermostat may have simply expired. The fact that replacing batteries did not help (provided they were installed correctly) is an indication.

Honeywell... | Answered on Jun 20, 2018

Check 1st the power source , the continuity of wiring (power cords) if all OK, check the fuse. if the rotor is dame is better to buy new one.

Honeywell... | Answered on Jun 19, 2018

replace it.

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Honeywell... | Answered on Jun 15, 2018

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