Honeywell CT3500 Programmable Thermostat User Guide

Honeywell CT3500 Manual: Questions and Answers

Can I use the Honeywell CT3500 with a heat pump system?

Yes, the thermostat supports single-stage heat pump systems. Use either terminal O or B for the heat pump changeover valve. User Guide, p. 22

What does the Honeywell CT3500 battery icon mean on the display?

The batteries are low and must be replaced. User Guide, p. 4

How many program periods does the Honeywell CT3500 support per day?

Four periods: Wake, Leave, Return, and Sleep. User Guide, p. 3

What battery issues can prevent the Honeywell CT3500 display from appearing?

Make sure batteries are installed correctly. If the display still doesn't appear, verify the thermostat is mounted and latched on the wallplate. User Guide, p. 19

Why won't my heating or cooling system respond on the Honeywell CT3500?

• System is not compatible with the thermostat. Check Table 1 compatibility chart.
• Power to the system is off at the furnace or fuse/circuit breaker panel.
• Cooling system operating when outdoor temperature is below 50°F, which can cause issues.
• Wires not properly connected to matching terminals on the wallplate.
• Factory jumper between terminals R and RC not removed when both terminals have wires. User Guide, p. 6

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