Customer Reviews For The Onelink Add-A-Wire For Wi-Fi Thermostat Models THERM-500 and THERM-500CP1

Overall Rating

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3 customers recommend this product
Joshua Down
May 6, 2026
Amazing

This First Alert smoke and carbon monoxide alarm is an absolute game-changer for home safety and smart integration. Installation was surprisingly straightforward; the included adapter plugs meant I didn’t have to mess with any complicated rewiring, and it fit perfectly into my existing hardwired setup.

James Sutera
June 22, 2018
Verified Purchase
Great product

Saved me the trouble of running wires through the wall.

Alex Liberman
March 27, 2018
Verified Purchase
Helped to make one link thermostat working

Perfect product -easy to follow instructions

Onelink Add-A-Wire for Wi-Fi Thermostats (AAW-311)

The Onelink Add-A-Wire AAW-311 is a specialized HVAC accessory designed to solve wiring limitations during smart thermostat installations. It effectively allows you to add an extra wire to your system without the labor-intensive process of running new cables through your walls. This device is specifically compatible with Onelink Wi-Fi Thermostat models THERM-500 and THERM-500CP1, making it an essential tool for upgrading older HVAC setups to modern smart home standards.

This versatile accessory is an ideal solution for several common installation challenges. It can be used to provide a "C" (common) wire to a four-wire system, enabling constant power for Wi-Fi thermostats, or to add cooling capabilities to a three-wire, heat-only system. By combining two signals onto a single existing wire, the Add-A-Wire accessory facilitates independent fan control and supports single-stage heat pump configurations, ensuring your system regains full functionality even when physical wiring is restricted.

Key Installation Applications:

  • Wire Expansion: Accommodates 5-wire thermostat requirements using only 4 existing wires.
  • System Upgrades: Easily add a cooling stage to a 3-wire heat-only system.
  • Repair Solution: Effectively bypasses a single broken wire within a cable bundle.
  • Power Delivery: Simplifies the addition of a common wire for modern smart thermostats.
  • Signal Consolidation: Combines two independent signals onto a single wire to restore fan or compressor control.

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