i am going from a hunter thermostat to a honewell th310d1004 it is,4wire system what do letters on the bottom mean

They are the color codes for each of the wires that attach there. E? (I didn't use that one), AUX-white, Y-yellow, G-green, O-orange, L? (didn't use that one either), R-red, B-(didn't use it but I think it's for black), C-cyan (blue). I hope that help. Mary

will this thermostat replace a honeywell RTH3100C1002-0726

Honeywell TH3210D1004 does NOT have “emergency” mode. Honeywell RTH3100C1002 does have “emergency” mode. Both of them operate with 2 stage heating. That means you can have a Heat Pump with Auxiliary Heat. For example the Aux Heat can be an electrical strips. If something happens with the outside unit and it is unable to operate for some reason, you can put the thermostat on “Emergency”. The electrical strips will start running, it will be expensive heating, but you will stay warm. You should call a HVAC tech. The second stage of heating might be a gas furnace, but I am not sure. We never use that configuration in my country. It just furnace or just Heat Pump with strips

Does it need the coverplate #50002883001?

No, the back of the tstat comes off to mount to the wall and connect the wires to. The front mounts to the wall plate and you are done. Just follow the instructions.

Does it work for gas and electric heat?

Yeah it will just make sure the switch on the back is in the correct position to run gas or electric heat and the setup program on the thermostat is set correctly also.

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HoneywellTH3210D1004 Non-Programmable Digital Thermostat

HoneywellTH3210D1004 Non-Programmable Digital Thermostat

Product ID: 2336347

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Details

Brand
Honeywell
Model Name
TH3210D1004
Product Dimensions
30"D x 8"W x
Controller Type
Push Button
Special Feature
Low Voltage

⚡Battery powered, low voltage

💡Backlit dual-temp display

🌡️±1°F precision comfort control

Description

🌡️ Stay cool, stay warm, stay ahead—comfort control made simple.

BUILT TO LAST IN THE USA - Crafted domestically with a 5-year warranty, ensuring durability and peace of mind.
DUAL TEMP DISPLAY CLARITY - See current and set temperatures simultaneously on a crisp backlit screen, day or night.
EFFORTLESS MODE SWITCHING - Simple slide switches let you toggle heat, cool, and fan modes with zero hassle.
PRECISION COMFORT MASTERY - Maintain your ideal temperature with ±1°F accuracy—no more guessing, just perfect climate control.
RELIABLE LOW VOLTAGE POWER - Runs efficiently on 2 AA batteries with low voltage design—energy smart and worry-free.

The Honeywell TH3210D1004 is a non-programmable digital thermostat designed for 2 Heat/1 Cool heat pump systems. Featuring a backlit display that shows both current and set temperatures simultaneously, it offers precise temperature control within ±1°F. Powered by 2 AA batteries and operating on low voltage, it ensures energy-efficient, reliable performance. With easy-to-use slide switches and a durable build backed by a 5-year warranty, this thermostat delivers straightforward, consistent comfort for your home or office.

Specifications

Brand	Honeywell
Model Name	TH3210D1004
Product Dimensions	30"D x 8"W x 6"H
Controller Type	Push Button
Special Feature	Low Voltage
Color	White
Specific Uses For Product	Heat Pump
Temperature Control Type	Heating
Connectivity Technology	Wi-Fi
Power Source	Battery Powered
Item Weight	0.65 Pounds
Voltage	24 Volts
Shape	Curved
Display Type	Digital
Control Type	Button Control
Control Method	Touch
Connectivity Protocol	Wi-Fi
Mounting Type	Wall Mount
Backlight	Yes
Number of Batteries	2 AA batteries required.
UPC	085267261142 085267025201 662551446982 784497876729 662766326956
Global Trade Identification Number	00085267261142
Manufacturer	Honeywell
Part Number	TH3210D1004
Item Weight	10.4 ounces
Item model number	672444
Batteries	2 AA batteries required.
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Special Features	Low Voltage
Batteries Included?	No
Batteries Required?	No
Battery Cell Type	Alkaline

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