Honeywell CT2800 Programmable Thermostat Installation Guide

Honeywell CT2800 Manual: Questions and Answers

How do I install batteries in the Honeywell CT2800?

Batteries must be installed for the thermostat to program and operate.

1. Set the System switch to OFF.
2. Using a coin, open the battery door.
3. Install batteries with positive and negative terminals oriented as marked inside the battery case.
4. Replace the battery door.
5. Remove the clear plastic label from the digital display. Installation Guide, p. 9

Can the Honeywell CT2800 work with a heat pump system?

No. If your system has six or more wires, or uses O or B terminals for changeover, or has second-stage heating or cooling, the CT2800 will not work. Return it and select an alternate thermostat model. Installation Guide, p. 9

What's the difference between Auto and On settings on the Honeywell CT2800 Fan switch?

Auto turns the fan on only with heating or cooling. On runs the fan continuously for improved air circulation.

Installation Guide, p. 19

What does flashing bAt Lo mean on the Honeywell CT2800 display?

Flashing bAt Lo indicates low batteries. Replace them as soon as possible, within the month. Installation Guide, p. 19

What voltage does the Honeywell CT2800 require for operation?

20 to 30 Vac. Installation Guide, p. 1

What do the DIP switches on the back of the Honeywell CT2800 control?

DIP switches 1 and 2 set the thermostat for your heating system type. Switch 3 toggles between Fahrenheit and Celsius display.

Installation Guide, p. 6

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