Lincoln 369801 Thermostat

What this thermostat does

A thermostat senses the temperature in your space and compares it to your setpoint. When heating or cooling is needed, it closes an internal circuit to call for conditioned air.

Most central HVAC equipment relies on a 24 V control signal from a transformer. Baseboard heating units run on line voltage instead. Because these systems operate on completely different electrical setups, confirming your setup is critical before servicing the controls.

Measurements and physical specs

Physical dimensions help you verify that the housing fits your existing mounting space or wall bracket. Check your old unit against these measurements.

• Height: 3.35 in / 8.51 cm
• Length: 3.5 in / 8.89 cm
• Width: 5.85 in / 14.86 cm

Matching the correct replacement part

When matching a thermostat, always confirm your heating and cooling system type, such as gas, electric, or heat pump. You also need to verify the number of heat and cool stages your equipment uses.

Some thermostats require a dedicated common wire, known as a C wire, to supply continuous power. Inspect your current wiring bundle to see if your setup provides one.

Part number 369801 replaces part number 461752. If your old unit is labeled with 461752 or 369801, this part matches that reference number.

How to replace a thermostat safely

A bad thermostat may fail to send a call for heat or cool, or it may lose power entirely. Once you confirm power is off, you can remove the old faceplate and disconnect the wiring.

1. Shut off power to the furnace or air handler at the breaker or power switch.
2. Remove the front cover of the old thermostat from the wall.
3. Take a photo of every wire before removing a part to record which wire connects to which letter.
4. Disconnect the wires, keeping them from slipping back inside the wall opening.
5. Move wires one at a time to the same spots on the replacement unit.
6. Restore power at the breaker and test the equipment for proper operation.

Read your old part

1. Shut off power and pull the existing thermostat off its mounting base.
2. Look at the label on the back or inside the housing for the part number.
3. Confirm the label shows part number 369801 or replacement number 461752.
4. Measure your existing space to ensure the height of 3.35 in / 8.51 cm, length of 3.5 in / 8.89 cm, and width of 5.85 in / 14.86 cm will fit.
5. Verify whether your setup is gas, electric, or heat pump, and check if a C wire is present.