Advanced Steps:
If you experience inability to connect, failure to register, or frequent Wi-Fi signal loss, verify the following:
*You may need assistance from your Internet Service Provider to verify/ change some settings*
Setup a 2.4GHz Bandwidth Only network with separate SSID (Not compatible with 5GHz networks.
Simultaneous 2.4 and 5GHz networks that share a name or SSID are not recommended and can cause
thermostat to lose connectivity).
Connect directly to the router signal – Not recommended for use with signal booster, satellites, or extenders.
Business Networks (Enterprise networks, guest networks, or networks that require logging in via a web
page/portal) are not supported.
Gateways or Network switches can block some traffic to Honeywell and are not supported.
Recommended WPA2-AES Network Security Protocol
DHCP Enabled – Static networks not supported
UPnP / P2P Enabled
Band-Steering Disabled
*”Not Supported” refers to network configurations that may be compatible, but cannot be successfully supported by
Resideo Customer Care. “Incompatible” refers to networks / configurations that the thermostat is incapable of
communicating with.*
Why won’t my thermostat screen power up?
The thermostat operates between 20-30 VAC, “supplied” to the R/RC terminals and “returning” through the C
terminal. A C wire, connected to C on the equipment, is required for the thermostat to power itself.
Verify the furnace / air handler door is closed, the power switch is on, and the breakers are on.
Confirm you have a C wire in the C terminal. If your previous thermostat did not use a C wire, it’s unlikely that it is
connected at the equipment. Verify the C wire is connected to the C terminal in your furnace or air handler.
Check your jumper selector switch. If you have a wire in the R terminal and no wire in the RC terminal, verify the
jumper selector switch is up in the “1 Wire” position. If you have a wire in the R terminal and a wire in the Rc terminal,
the jumper selector switch must be in the “2 Wire” position.
Advanced steps:
Using a multimeter, measure the AC voltage between your R/ RC wire and your C wire. Your thermostat operates
between 20-30VAC, any reading outside this range should be addressed by a Professional Contractor.
SPECIFICATIONS
T5 Smart Thermostat without C-wire Adapter
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