I put in a new thermostat the old one was removed without labeling the wires

';	Making the wiring connections for a thermostat when the old thermostat was removed without labeling the wires © By: Dave Rongey

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Electrical Question from Diane
[ad#block]Electrical Question: I put in a new thermostat. The old one was removed without labeling the wires. A furnace and air conditioner are both run on it. Thermostat wires consist of blue, white, red and green. Furnace wires are White in white, blue in yellow, green in green Red in Red. Air conditioner consist of two wires. Red wire is with blue wire from furnace in yellow spot. White wire is in a “c” spot. There is a RC spot on thermostat that has a jumper wire to the red spot. Any suggestions. On the thermostat I have the blue wire in the blue spot and the white with white spot and green with green and red with red. The air only works when in the heat mode of the thermostat. If you need pictures I can try to get them tomorrow.

This electrical question came from: Diane, from Goodells, Michigan
See more about Home Wiring for Michigan

Dave The Electrician’s Reply:
Thanks for your electrical question Diane

Wiring a Thermostat

Making the wiring connections for a Thermostat

There are specific wiring assignments for thermostats that are common for most heating and cooling units and this will need to be identified for your specific thermostat and home heating and cooling system as described below.

More about Wiring a Thermostat

How to Wire a Thermostat

Wiring Instructions for a Honeywell Thermostat: I bought a Honeywell Heating thermostat. There were no directions about how to wire it.

Installing Programmable Thermostats

How to Install a Programmable Thermostat for Room Heating Unit

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Please Note:
Unless otherwise posted, please refer to the following Guidelines when working on Electrical Projects:

Skill Level:
Intermediate to Advanced - Electrical Repairs and Circuit Wiring is Best Performed by a Certified Electrician or Licensed Electrical Contractor.

Electrical Tools Required:
Basic Electricians Pouch of Hand Tools, a Voltage Tester and a Multi Meter.

Estimated Time:
Depends on personal level experience, ability to work with tools, work with electrical wiring, and the available access to the project area.

Precaution:
Identify the project circuit, turn it OFF and Tag it with a Note before working with the wiring.

Important:
Modifying existing electrical circuits or installing additional electrical wiring should be done according to local and National Electrical Codes, with a permit and be inspected.