We list part number TH1320U4002 as a compatible replacement for TH3110D1008. It is a non-programmable thermostat designed for multi-stage systems.
The part that replaces it
FocusPro N100 Non-Programmable, 3H/2C Heat Pump, 2H/2C Conventional, Large Display Thermostat (Honeywell Home TH1320U4002)
- 1F57-306
- P320-0110
- T841A1563
- T841E1007
- TH3110D1008
- TH3210D1004
- TH5220D1003
- TH5220D1029
- Use: Multi-Stage (Heat/Cool). Compare with the label on your old part.
- Stages: 2 Heat/2 Cool (Conventional). Compare with the label on your old part.
- Programming: Non-Programmable. Compare with the label on your old part.
What the Thermostat Does
A room thermostat monitors indoor temperature and signals your heating and cooling equipment to run. Most home thermostats send a 24 V control signal from a transformer to manage these operations.
When temperatures rise or fall past your setpoint, the thermostat closes the proper circuit to turn on the furnace, heat pump, or air conditioner.
Why This Replacement Fits
The Honeywell Home TH1320U4002 is listed as a replacement for part number TH3110D1008. It matches systems needing multi-stage heat and cool control.
This model also replaces other common part numbers. It serves as an alternative for T841E1007, P320-0110, T841A1563, TH5220D1029, 1F57-306, TH5220D1003, and TH3210D1004.
- Controls 2 Heat/2 Cool conventional systems and up to 3H/2C heat pump setups.
- Non-programmable design with push button controls.
- Auto changeover option to swap between heating and cooling.
- Horizontal mount with battery power.
What to Match Before You Swap
Check your existing system configuration before changing parts. Most central systems run on 24 V, while baseboard heaters use line voltage. These types are not the same, so verify your system voltage first.
Make sure your equipment matches the supported stages. This replacement works with 2 Heat/2 Cool conventional setups and multi-stage heating and cooling. You should also verify if your setup provides battery power or requires a C wire.
Installation Tips
Before you pull the old thermostat off the wall, take a photo of which wire goes to which letter terminal. Moving wires one at a time to the matching spots on the new subbase prevents wiring mistakes.
The TH1320U4002 mounts horizontally and runs on battery power. It operates in temperatures from 32°F to 120°F and humidity levels from 5 to 90% RH, non-condensing.
How to confirm it fits
- Check the part number on your old unit to confirm it is TH3110D1008.
- Confirm your system uses multi-stage heat and cool operation.
- Verify your setup matches 2 Heat/2 Cool conventional stages.
- Ensure you want a non-programmable thermostat with push button controls.
- Check that your wall space accommodates a horizontal mount.
Questions
What other numbers does the TH1320U4002 replace?
It replaces T841E1007, P320-0110, T841A1563, TH5220D1029, TH3110D1008, 1F57-306, TH5220D1003, and TH3210D1004.
Is the TH1320U4002 programmable?
No. The TH1320U4002 is a non-programmable thermostat with push button controls.
How is the replacement thermostat powered?
The TH1320U4002 uses battery power.
Does this thermostat switch between heating and cooling on its own?
Yes. It features auto changeover.
Related guides
Brand names and part numbers are used only to show fit. HVAC Fitter is not affiliated with, authorized by, or endorsed by any equipment maker. If you are not sure a repair is safe for you, call a licensed HVAC technician.