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Your cart is empty.Install a Smart Thermostat Without a C-Wire. The C-Wire provides a path for continuous power to Wi-Fi thermostats, but often homes are missing this common wire. The C-Wire Power Adapter makes Honeywell Home smart thermostats compatible with most homes that don’t have this wire.
MYOB
Reviewed in the United States on February 5, 2025
Easy enough to install. Allowed use of a 21st century, Internet-enabled controller, in our 20th century (70s) house.
Rachel Ho
Reviewed in the United States on February 24, 2025
Fit on top of our older Honeywell
Nikolay S.
Reviewed in the United States on February 16, 2025
Easy to install, does the job. You can go without it but you will lose the option to run the fan only. Connect the green wire for power at the thermostat, and the red for common
Brad Braswell
Reviewed in the United States on February 1, 2025
TL,DR: Using this with an Amazon Smart Thermostat and works fine.Though I did have a small moment of panic initially after installing everything and setting up the thermostat itself. As I was admiring my work and watching the thermostat come to life and wake up in its new home, it began “clicking on” and then immediately going blank for several seconds. At first I was thinking this may be part of the set up… until it didn’t click on again and was unresponsive in every way. At this point I just knew for sure I fried something, was going to have to call a technician out, and they were going to tell me I’d have to replace my entire system for thousands of dollars. I grabbed my multimeter and verified I had power coming to the furnace and then checked the small 3 amp fuse at the control board which was blown. I switched that out with one I luckily had on hand and everything came back to life as I threw the breaker back on. That was yesterday afternoon and everything has been working fine ever since.Further things I learned during this process:- What each wire does on a heat pump system (hence the pic with them identified).- This adapter combines the fan and condenser wires to free up a wire to be used as the C-wire- The C-wire is effectively the return for the 24v to the thermostat to complete the circuit (think chassis ground on a car or neutral on a home circuit).- If you have an unused wire on your thermostat cable, you don’t need this. Just hook that unused wire to the C-wire in your furnace (look for the blue wire coming from your outside unit and verify where it goes to the control board in the furnace) because even if you get this, you still gotta find a C wire to connect it to.
PTPeres
Reviewed in the United States on August 29, 2024
Product's instructions were less than good but workable. Even then, the product doesn't supply any power to the Alexa thermostat. I wasted time and money with the electrician only to determine that this thing is defective and there is no way to even test it. Don't buy it.
Kindle Customer
Reviewed in the United States on December 29, 2024
works great
CRCiii
Reviewed in the United States on October 8, 2024
unnecessary, adaptor
TM1NE
Reviewed in the United States on October 6, 2024
This converter was easy to install and came with easy to follow instructions. No issues getting the Honeywell Wifi thermostat connected to our hvac system. Our home was built in the 70s and naturally lacked the 5th wire to connect a 24v line to the thermostat. I was skeptical when buying this as it seemed too good to be true to get that power wire this easily. No issues!Something I ran into during install that wasn't really covered in the wiring instructions: My furnace is an HE model, the yellow wire was split off the main circuit board on the furnace and it was ran to a float safety switch, then off to the thermostat from that switch. Make sure you wire in this box after the switch not directly off the circuit board. This float prevents the unit from running if it is full of water and not draining.
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