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White rectangular thermostat with green digital display

WHITE RODGERS (EMERSON ELEC)

WHITE RODGERS 1E78-151 Thermostat 5-2 Program 1H 1C Battery 24VAC

SKU CH-QHTA-0RW72

Programmable 5-2 day thermostat with one heat and one cool stage, digital green display, and battery backup for 24VAC systems

  • TypeLearning Thermostats
  • ColorWhite
  • 5-2 programmable schedule fits weekly routines
  • Single-stage heat and cool compatibility
  • Green digital display for clear reading
  • Battery backup keeps settings during power loss
  • Terminal layout supports common HVAC wiring

Purpose & Fit

The White Rodgers 1E78-151 is a low-voltage digital thermostat designed for single-stage heating and cooling systems. It suits homeowners who want a straightforward 5-2 programmable schedule with a green backlit display and battery backup.

Upgrade Path

This unit replaces older non-programmable or 5-1-1 models that lack separate weekday and weekend schedules. The jump is worth it when you need four daily temperature settings and a simple heat-cool-off system switch without Wi-Fi complexity.

Sustained Operation

Battery backup preserves the program during power interruptions while the 24 VAC supply runs the display and relays continuously. The green digital readout remains legible over long periods and the keypad lockout absence allows quick temporary overrides whenever required.

Highlights

  • 5-2 programmable schedule fits weekly routines
  • Single-stage heat and cool compatibility
  • Green digital display for clear reading
  • Battery backup keeps settings during power loss
  • Terminal layout supports common HVAC wiring

Specifications

BrandEMERSON
TypeLearning Thermostats
ColorWhite

Questions about this item

Which terminal designations does the 1E78-151 thermostat provide for wiring?

The thermostat provides terminals labelled B, G, O, RC, RH, W and Y for connecting the low-voltage control wires of a 24 VAC heating and cooling system.

What is the correct sequence for powering the 1E78-151 thermostat during installation?

Turn off power to the HVAC system, wire the thermostat to the terminal block, insert the batteries, then restore system power so the display activates.

How often should the batteries in the 1E78-151 thermostat be replaced?

Replace the backup batteries once a year or when the low-battery indicator appears on the green digital display.

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