Honeywell CT1500 User Manual

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Timer Thermostat

Fuel Saver

Heating-Only Thermostat and Wallplate or Heating/Cooling

Thermostat and Subbase Models CT1500, CT1501, CT1502, CT1503

• Heat Only—CT1500

• Heat/Cool—CT1501

• Central Electric Heat/Cool or Single Stage

Heat Pump without auxiliary heat—CT1502

• Millivolt Heat—CT1503

OWNER’S MANUAL

69-0333-6

Table of Contents

Questions and Answers:

C
Cindy SmallAug 13, 2025
Why is my Honeywell CT1500 Thermostat not producing heat?
- K
  Kimberly BakerAug 13, 2025
  If your Honeywell Thermostat isn't producing heat, ensure the system switch is in the HEAT position. Also, check the fuse or circuit breaker; replace or reset if necessary. Verify that the furnace power switch is ON and, if applicable, relight the pilot flame following the furnace manufacturer's instructions. Finally, turn off power to the furnace and inspect the RH and W thermostat connections for correct terminal hookups, repairing any frayed or broken wires, and firmly tighten all terminal screws.
E
edwardsellenAug 17, 2025
How to fix no cooling on my Honeywell CT1500?
- O
  ovargasAug 17, 2025
  If your Honeywell Thermostat isn't providing cooling, make sure the system switch is set to the COOL position. Check the fuse or circuit breaker and replace or reset it if needed. Also, verify that the condenser switch (located outdoors) is in the ON position. Finally, turn off power to the cooling system and check the Y, G, and RC thermostat connections for correct terminal hookups. Repair any frayed or broken wires and firmly tighten all terminal screws.
A
Amber DurhamAug 20, 2025
What to do if heat-on time is too long on Honeywell CT1500?
- A
  Andrew WeberAug 20, 2025
  If the heat-on time is too long on your Honeywell Thermostat, decrease the anticipator setting by 0.05 and observe the heating system operation.
S
samantha73Aug 25, 2025
What to do if heat-on time is too short on Honeywell CT1500 Thermostat?
- K
  Kristina FranklinAug 26, 2025
  If the heat-on time is too short on your Honeywell Thermostat, increase the anticipator setting by 0.05 and observe the heating system operation.
A
adouglasAug 28, 2025
Why are room temperatures not correct with my Honeywell CT1500 Thermostat?
- D
  David ScottAug 28, 2025
  If your Honeywell Thermostat's room temperatures are incorrect, reset the thermostat setpoint levers to your desired temperatures. Additionally, check the position of the subbase system switch and move it to the desired operating position.
S
stephen31Sep 1, 2025
What to do if Honeywell CT1500 Thermostat temperature changes at the wrong time?
- J
  Jasmine BakerSep 1, 2025
  To correct a Honeywell Thermostat temperature change that occurs at the wrong time, relocate the program pins to your desired settings.
S
Sharon RamirezSep 5, 2025
How to fix rooms that don't warm up at programmed time on Honeywell CT1500?
- E
  elizabethwolfeSep 5, 2025
  If rooms don't warm up at the programmed time with your Honeywell Thermostat, move the red pin one-half hour earlier on the program dial, as the timer program for the heating system may need more time to warm up the rooms.
Z
zpetersSep 8, 2025
How to fix Honeywell Thermostat energy savings temperature program 12 hours off?
- D
  Daniel WilsonSep 8, 2025
  To resolve a Honeywell Thermostat energy savings temperature program that is 12 hours off, turn the timer ahead 12 hours. Move the setting knob clockwise only, ensuring the program dial is set for the proper day or night phase.

Honeywell CT1500 Specifications

General

Display	Digital
Voltage	24V
Display Feature	Backlit
Temperature Range	40°F to 90°F
Power Source	Battery
Compatibility	Single Stage Heating and Cooling Systems
Programmability	Non-Programmable
Batteries Required	2 AA batteries (not included)

Summary

Timer Thermostat Fuel Saver

Recycling Notice

Features of Your Thermostat

Reviewing Your Family Schedule

Setting The Temperature

Setting Subbase Switches

Inserting Timer Batteries

Setting The Timer

Programming

Before setting your program

Instructions on preparing for thermostat programming.

Setting the heating program

Guidance on setting the thermostat for heating schedules.

Setting the cooling program

Instructions for setting thermostat for cooling schedules.

Temporarily changing the program

Moving the program index wheel

Method for temporarily altering the thermostat's programmed schedule by adjusting the index wheel.

Pushing the setting levers together

Method for temporarily holding a specific temperature by adjusting the setting levers.

Troubleshooting

Servicing The Thermostat

System on-length adjustment

Adjusting the thermostat's heating system cycle length using the anticipator.

Thermometer adjustment

Toll-free Consumer Services

Typical Energy Savings

Limited One-Year Warranty

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