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Electrical Wire and Cable

How to Replace a Thermostat

Why does my new thermostat not work? What to Check When Replacing a Thermostat.


Thermostat Problem
Electrical Question: Why does my new thermostat not work?

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. I put the old thermostat back on within 20 minutes but it did not work either. I reinstalled the new one today and called the manufacturer and I verified that it was wired correctly, but I found that the red wire was not sending power to anything. The red wire appears to be issue. It sent power yesterday, but as soon as I tool the old thermostat off nothing has worked since.

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.

Problems when Replacing 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 if a New Thermostat is not Working

More about Replacing and Wiring a Thermostat

Troubleshooting  Thermostat Wiring Connections

Repair Electrical Wiring
Troubleshooting

Troubleshooting and Repairing Electrical Wiring

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


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