Honeywell T4 · Reset guide
How to reset Honeywell T4
Sources checked · how we check
These steps cover the European wired T4 in Resideo's linked manual. The US T4 Pro, wireless T4R and T4M need their own instructions.
01 · Start here
Before resetting your device
- For a blank display, check batteries as described in the manual before attempting a reset.
Source: Resideo: European wired T4 installation guide (page 2)
02 · Reset options
Reset options for Honeywell T4
Before you confirm
Factory reset affects installer parameters. Record their current values first; have your installer restore them if you do not know your heating system's configuration. Leave wiring covered.
Wired T4: factory settings
Advanced menu → 16 FS → 1
- Hold Menu, then also hold + until the display changes (about three seconds).
- Navigate with the tick and back buttons to 16 FS. Use + / − to set its value to 1, then tick to save. Home exits the advanced menu.
Source: Resideo: European wired T4 installation guide (page 2)
After the reset
Restore the correct heating parameters and review your schedule.
Frequently asked questions
Can I restore only the schedule?
Use 15 SD with value 1 in the advanced menu instead of 16 FS.