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Electrical Wire and Cable

How to Change a Thermostat

By Dave Rongey - Summary:

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

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 Installing a Thermostat.
Skill Level: Beginner to Intermediate.
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

More about Wiring a Thermostat

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

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2 Responses to “How to Change a Thermostat”
  1. 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,

  2. 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