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

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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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How to Troubleshoot and Repair Electrical Wiring
Wiring Methods for Upgrading Electrical Wiring
NEC Codes for Home Electrical Wiring
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The Safest Way to Test Electrical Devices and Identify Electric Wires!
The Non-Contact Electrical Tester

This is a testing tool that is a Non-contact tester that I use to easily Detect Voltage in Cables, Cords, Circuit Breakers, Lighting Fixtures, Switches, Outlets and Wires. Simply insert the end of the tester into an outlet, lamp socket, or hold the end of the tester against the wire you wish to test. Very handy and easy to use.

The Quickest Way to Check for Faulty Electrical Wiring!
The Plug-In Outlet Tester

This is great to troubleshoot a problem with outlet circuit wiring, is also used by most inspectors to test for power and check the polarity of circuit wiring.
It detects probable improper wiring conditions in standard 110-125 VAC outlets Provides 6 probable wiring conditions that are quick and easy to read for ultimate efficiency Lights indicate if wiring is correct and indicator light chart is included Tests standard 3-wire outlets UL Listed Light indicates if wiring is incorrect, Very handy and easy to use.

Strip Off Wire Insulation without Nicking and Damaging the Electric Wire!
The Wire Stripper and Wire Cutter

A wire stripping tool used to safely strip electrical wires. This handy tool has multiple uses: The wire gauges are shown on the side of the tool so you know which slot to use for stripping insulation. The end of the tool can be used to grip and bend wire which is handy for attaching wire onto the screw terminals of switches and outlets.

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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.

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

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