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Model #FSCM00

Common Maker Thermostat Wire Extender (Adds a Common C Connection)

  • Made from high-quality plastic to ensure durable use
  • Efficiently operates over existing 2-wire thermostat cable
  • Works with all brands of Wi-Fi thermostats and HVAC equipment
  • See More Details

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Product Overview

The Common Maker adds a common C connection to a thermostat cable with 2 or more wires. A common connection allows the thermostat to operate without batteries or power stealing circuits. Compatible with all major name brand Wi-Fi thermostats and HVAC equipment, including furnaces, air handlers, zone valves, zone controllers, millivolt systems, and more.
  • Adds a common C connection to any popular Wi-Fi thermostat
  • Operates over the existing 2-wire thermostat cable
  • Product is only to be installed by a qualified heating and cooling technician
  • Some installations may require a 24-Volt transformer to be installed

Info & Guides

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Specifications

Details

Accessory Type
Thermostat Kit
Operating Temperature Range (F)
0
Pack Size
1
Returnable
90-Day
Voltage (volts)
AC24V

Warranty / Certifications

Manufacturer Warranty
Lifetime Warranty

Questions & Answers

4Questions6Answers

Will this work with my Sensi ST55?

Asked by Pete March 2, 2021
1
Answer

Assuming you are lacking a common and need to add one. But to be certain I would contact the manufacturer of the thermostat as I have no experience with that one.

I have a Taco VZC404-4 relay that connects to my system. I have 3 thermostats that connect to my ...

Asked by EFC83 November 25, 2020
2
Answers

Didn’t work and burned the component

We have 3 thermostats, one for each heating zone in the house. Can this provide sufficient power ...

Asked by David November 12, 2020
2
Answers

This works only for one thermostat, so if you have 3 thermostats, you need 3 Common Makers.

Is this UL-listed? My insurance company said that if it's not, they won't cover a house fire cau...

Asked by corton January 18, 2020
1
Answer

This product has not been certified by Underwriters Laboratories. I called fast stat to ask. They indicated there intention was to seek certification from that company but at this point they had not requested it.

Customer Reviews

  • 3.8
    out of 24 reviews
  • 71% recommend this product
Filter by:
Showing 1-10 of 24 reviews
Product enabled me to add a Common connection to convert my 2 wire Thermostat/ furnace to a 3 wir...
Product enabled me to add a Common connection to convert my 2 wire Thermostat/ furnace to a 3 wire connection for use with Smart thermostats that require a power source. Instructions were straightforward. Install was easy, just requiring Wire nuts. Made EcoBee installation very easy.
by TMBrand
Worked perfectly to allow installing my smart thermostat (Ecobee) without...
Worked perfectly to allow installing my smart thermostat (Ecobee) without needing to replace my existing 2-wire thermostat wire. Install couldnt have been easier. Highly recommended.
by TimG
Rating provided by a verified purchaser...
Rating provided by a verified purchaser
by HomeDepotCustomer
Device did not work as advertised for basic furnace with...
Device did not work as advertised for basic furnace with C, H, and W
by JONATHAN
Fine when they work
Installed 5 for my 6 zones. They were fine when they worked but did lead to the furnace short cycling which we were never able to troubleshoot till we decided to remove them. When one of the relays went (after 2 years), the furnace started making a loud noise and it was pretty much impossible to know which relay is the source of the problem and/or even the relays were the source till they were removed; decided to take all the relays off and the problem stopped and so did the short cycling. Highly recommend rewiring your thermostats if you can or running a common from a 24 volt transformer which is which I ended up doing. This ordeal ended up costing me 8 hours of troubleshooting by an HVAC expert (well over $1000).
by Cham
Rating provided by a verified purchaser...
Rating provided by a verified purchaser
by HomeDepotCustomer
It didn't work. I went through all the debugging...
It didn't work. I went through all the debugging rules and even called their support line to verify I did things correctly. It took a few days to get the product shipped to HD, then picked it up, then took several days of installation (bigger hole in wall, etc.) only to find out that the unit I had was defective. Returned to HD. In the end I found out that I could purchase a $1.00 resister and add that to my System 2000 furnace (between the red and white thermostat wires for my Nest) and it permits my Next to get the power it needs.
by Doug
by Bill
Was faulty after less than two months. I need to return it.
Was faulty after less than two months. I need to return it.
by Litespeed
Great, works very well and smaller than the previous version!...
Great, works very well and smaller than the previous version!
by CYRIL
Showing 1-10 of 24 reviews