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Honeywell Thermostat Wiring Instructions

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Honeywell Thermostat Wiring Diagram

When in the market for a new Honeywell thermostat, make sure you understand your Honeywell thermostat wiring needs before upgrading.

Q: I installed my new programmable thermostat, but it won’t turn on.

A: If you plan to upgrade to a new thermostat make sure you have the proper number of wires available, otherwise your new thermostat won’t work. If you do need additional wires, you will want to consider how difficult installing new wires will be for your application, and if you need to budget for an electrician or hvac tech to install the proper wiring.

Modern electronic thermostats are no different from any other technology, in that they can do more, but can also seem complicated to install and understand. One comfort to know is the basic wiring hasn’t changed much, with exception of an additional wire to get some programmable digital thermostats operating.

Note: For specific thermostat model installation manuals and wiring instructions, refer to our Thermostat Buying Guide for a complete list and link of manufacturers. Individual thermostat model information is most likely the best place to find particular manuals, and not a general manuals category that can be found within the search function.

SEE ALSO: In-Depth Thermostat Wiring Explained
SEE ALSO: Heat Pump Thermostat Wiring
SEE ALSO: Manufacturer Thermostat Installation Manuals – manuals online or manualslib

NOTE: This article provides the basics of what to expect and look for when wiring a new or existing thermostat. With the many brands and models of thermostats existing, along with the numerous issues that could arise with corresponding devices, we suggest contacting the thermostat manufacturer technical department or have a professional local service tech do an inspection of your system if not operating properly.

4 Wire Honeywell Thermostat Wiring

  • G – Fan (green wire)
  • R – 24 VAC / Rc and R or Rh (red wire)
  • Y – Compressor / air conditioner (yellow wire)
  • W – Heat (white wire)

Note: A previous installer may have used a different set of color wires. This will be a non issue to keep track of if a whole new set of thermostat wires is pulled. Otherwise tag the wires before removing from the existing thermostat, or take note of the terminals each wire is attached to.

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5 Wire Honeywell Thermostat Wiring

Some programmable thermostats (e.g. Honeywell Prestige wiring requirements) need a minimum of 5 wires, and maybe more depending on what features you want to operate (humidifier, etc). The additional 5th wire will be for common; providing stepped down power from a transformer.

  • G – Fan (green wire)
  • R – 24 VAC / R and Rc (red wire)
  • C – 24 VAC Common (color can vary per manufacturer – may be blue, purple, brown. etc.)
  • Y – Compressor / air conditioner (yellow wire)
  • W – Heat (white wire)

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Furnace Electrical Board Connections

Going into your furnace may sound intimidating, but if you have the basic knowledge of wiring, and know how to remove the proper furnace panels to access the electronics, then you should be fine. The COM 24V terminal will be connected to the C (24 VAC common) of the thermostat.
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How to Install Thermostat Wire

If you have easy access to the existing thermostat wires, just remove and follow the same path with the new set of wires. You can use cable ties, electrical tape, or staples (securing wires and cables article). Be sure to take a very conservative measurement on how long your new set of wires should be. You don’t want to start over, if you come up short.

Any home improvement store should carry thermostat wiring. Also check local electrical and lighting supply houses.

If wires pass through a floor and up into a wall cavity before reaching a thermostat. Try the following.

  • Start at the thermostat location. (i) A simple trick for pulling new wires to replace existing ones: tape one end of the new wires to the end of the existing wires coming through the electrical box or wall opening. Make sure to tape completely over the wire ends, so no edges are present that can snag something. (image below)
  • Slowly pull the new set of the wires down through the wall from the basement. (i) Use any object larger than the hole in the wall, and tie or fasten to the end of your new wires, so you don’t pull all the wire through the wall. e.g. pencil or flat washer, to act as a stop. Use electrical tape to secure if necessary.

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In a situation where the original thermostat wires may have been stapled to an interior wall stud, and not run through conduit, you may be better off leaving the existing set of wires, and cutting them off at the entry and exit points of the wall. Then feed new wires with a fish tape (Klein Tools). Check your local home improvement stores, or local tool rental, for rental availability.

CAUTION: ELECTRICAL HAZARD – Always turn off power via breaker or fuse box to avoid injury. Contact a certified Electrician or HVAC tech if unsure of your DIY capabilities.

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Garbage Disposal Installation and Replacement

These InSinkErator® video tutorials provide a detailed visual how-to for garbage disposal installation.

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InSinkerator Disposer Installallation

Adding a new garbage disposal to your sink? InSinkErator® will guide you through with their detailed step-by-step video instructions.

How to install a InSinkErator garbage disposal

Along with providing full video tutorials, InSinkErator also created handy step-by-step written instructions for many garbage disposal related installation and troubleshooting questions, along with addressing common garbage disposal questions and concerns.

Note: Check your local building codes for connecting the dishwasher drain to the disposer. For bacteria buildup concerns, some cities and states require the dishwasher drain to be directly fitted to the drainpipe and not the garbage disposal. However, this is only a concern if you plan on selling, in which the drainage will have to be connected according to local building codes to pass inspection. If you plan on staying in your home, you can choose whichever dishwasher drain connection option.

Direct Replacement of an InSinkErator Disposer

If upgrading and replacing an existing InSinkErator garbage disposal, InSinkErator makes sure the job is super easy with their universal Quick Lock® sink mount. Whether, choosing a more budget friendly Badger Series or investing in the premium Evolution Series, you’ll find that InSinkErator designed their garbage disposers to be a direct replacement.

I can attest from personal experience the simplicity of upgrading to a new InSinkErator

Each new disposer is provided with a Quick Lock sink mount, but if the existing Quick Lock® sink mount is in excellent condition, you can save a lot of time and inconvenience by attaching the new disposer to the existing Quick Lock® sink mount.

Choosing a InSinkErator Disposer

InSinkErator has a full list of features and specifications for each individual disposer to help you choose the right disposer for your application and budget.

Q) What’s the difference between the InSinkErator garbage disposals sold at Home Depot?

A) A Consumer Specialist from InSinkErator responded with “The differences between the InSinkErator brand models and the comparable models offered at Home Depot are horsepower, grinding components, length of warranty and some aesthetic differences in trim shell colors, etc. The same high quality of materials and workmanship are found on all models manufactured by InSinkErator”.

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