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Electrical Wire and Cable

How to Wire a Honeywell Thermostat

How do I connect the wires for a heater thermostat? Wiring Instruction Heating Thermostat, Typical Thermostat Wiring for Furnace Heating and Air Conditioning.

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Wiring Guide for a Honeywell Thermostat
[ad#block] Electrical Question #1: How do I connect the wires for a heater thermostat?

This electrical wiring question came from: Pamela, a Handy woman from Brockton, Massachusetts.
Additional Comments: Great!

Electrical Question #2: How is a Honeywell Thermostat wired?

This electrical wiring question came from Christie in Phoenix, Arizona.

Dave’s Reply:
Thank you for your electrical wiring questions.

Wiring Instructions for a Honeywell Heating Thermostat

Application: Wiring a Honeywell Thermostat.
Skill Level: Beginner to Intermediate.
Tools Required: Basic Electricians Pouch Hand Tools.
Estimated Time: Depends on personal level experience and ability to work with tools.
Precaution: Identify the furnace or air conditioning circuit, turn it OFF and  Tag it with a Note before working with the wiring.

Typical Thermostat Wiring for Furnace Heating and Air Conditioning

Terminal  Label –    Wire Color  –   Function /Description

Although many home heating and air conditioning systems have a standard type thermostat cable with color coded wires, the wires should be identified to make sure of the exact purpose for each wire.

More about Wiring a Thermostat

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FAQs Frequently Asked Questions and Comments

3 Responses to “How to Wire a Honeywell Thermostat”
  1. Dave Rongey says:

    Hi Allen,
    If the fan is working from the manual fan switch on the thermostat then one of the components of the heating system may be faulty. There are several events that must take place before the control board will allow the heating process to begin. Each of the components are monitored by sensors, such as the exhaust discharge fan, and limit switches. If any one of these components or sensors are not working properly, or if the main control board is faulty then the heating cycle will not be triggered to start. This problem will require specific testing and troubleshooting of your furnace to locate the problem and then make the necessary repairs.
    I hope this helps,

  2. ALLAN HURST says:


  3. Don says:

    A simple electronic schematic for a heat cool thermostat would be nice.