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Electrical Wire and Cable

How to Change a Thermostat

Thermostat Problems and How to Fix Them: Wiring a Heating and Air Conditioning Thermostat.

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How to Wire a GFCI Outlet without a Ground Wire

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Replacing a Thermostat
Electrical Question: I have two thermostats, one downstairs in the hallway and the other one is upstairs in my bedroom. I wanted to replace them with a digital thermostat. I was able to change the downstairs thermostat, but when I tried to do the upstairs I had no success.

What do you think I did wrong?


This electrical question came from: Jason, from Atlanta, Georgia.

Dave’s Reply:
Thanks for your electrical wiring question Jason.

Wiring a Heating and Air Conditioning Thermostat

Application: Replacing and Wiring a Thermostat.
Skill Level: Beginner to Intermediate. This electrical wiring project is best performed by a Licensed Electrical Contractor or Certified Electrician.
Tools Required: Basic Electricians Pouch Hand Tools and Voltage Tester.
Estimated Time: Depends on personal level experience and ability to work with tools.
Precaution: Identify the circuit for the furnace or heat pump, turn it OFF and  Tag it with a Note before working with the thermostat wiring.
Troubleshooting and Testing: Most thermostats may be tested using a Volt/Ohm Meter. The thermostat battery should be tested and replaced as needed.
Notice: Make sure to get the exact replacement thermostat.

Guidelines for Replacing a Wall Thermostat

Replacing a Thermostat can be tricky, but it is possible when you follow these Guidelines

Common Thermostat Problems and How to Fix Them

See More about Wiring a Thermostat

How to Install a Programmable Thermostat for Room Heating Unit

Electrical Circuit for Caret Baseboard Heaters: When we tried to convert from ceiling heat to a cadet baseboard heater we found three bedrooms were all on the same circuit.

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

How to Install Electrical Wiring for a 240 Volt Wall Heater

Related Questions about wiring a thermostat

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Complete Guide to Home Electrical Wiring

Perfect for Homeowners, Students,
Handyman, Handy Women, and Electricians
Wiring GFCI Outlets
Wiring Home Electric Circuits
120 Volt and 240 Volt Outlet Circuits
Wiring Light Switches
Wiring 3-Wire and 4-Wire Electric Range
Wiring 3-Wire and 4-Wire Dryer Cord and Dryer Outlet
How to Troubleshoot and Repair Electrical Wiring
Wiring Methods for Upgrading Electrical Wiring
NEC Codes for Home Electrical Wiring
....and much more.

Be Careful and Be Safe - Never Work on Energized Circuits!
Consult your Local Building Department about Permits and Inspections for all Electric Wiring Projects.

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FAQs Frequently Asked Questions and Comments

2 Responses to “How to Change a Thermostat”
  1. Jer says:

    I bought a cadet 6 foot baseboard heater and they sent me a 4 pole thermostat and I only need a 2 pole, how can I make the 4 pole one work? or can I?
    Thanks, Jer

  2. Dave Rongey says:

    Hi Jer,
    The thermostat that you are describing is typically used to control the 240 volt circuit, consisting of the Line and Load circuit wiring. Please refer to the wiring diagram which is included with the thermostat of the baseboard heater.
    I hope this helps,