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How to Replace a Thermostat


By Dave Rongey - Summary:

Replacing a Thermostat: I am installing a thermostat. The original thermostat worked correctly and there was no issue. I removed the original thermostat yesterday and installed the new one, but it did not work.

Thermostat Wire Connections

Electrical Question: I am installing a thermostat. The original thermostat worked correctly and there was no issue. I removed the original thermostat yesterday and installed the new one, but it did not work.

Thanks for the Help!

This electrical wiring question came from Dan, in Summerville, South Carolina.

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

Preparations for Wiring a Thermostat
Application: Thermostat for Controlling HVAC Heating Ventilation and Air Conditioning.
Skill Level: Beginner to Intermediate – Best if wired by a Licensed Electrical Contractor.
Tools Required: Basic Electrical Hand Tools including a small screw driver and small wire strippers.
Estimated Time: Depends on personal level experience and ability to work with tools and the small thermostat wires.
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 or or one that is a compatible replacement, such as a fully programmable thermostat.

What to Check When Replacing a Thermostat

More about Wiring a Thermostat

Troubleshooting  Thermostat Wiring Connections

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Electrical Troubleshooting Methods used to solve the majority of the home electrical problems and wiring failures encountered.



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