How to Purchase a C-Wire Power Adapter or Replacement Backplate

Last updated: November 11, 2026

If you need a Mysa C-Wire Power Adapter or a replacement backplate/wiring base and you can’t find it by browsing getmysa.com, use the steps below.

Mysa C-Wire Power Adapter

The Mysa C-Wire Power Adapter is available for purchase separately for compatible 24V thermostat systems that need a C-wire.

  1. Go directly to the Mysa C-Wire Power Adapter product page.

  2. Add the adapter to your cart and complete checkout.

  3. If the page is unavailable, out of stock, or checkout does not work, contact Mysa Support and include your thermostat model, country, and a brief description of what you need.

Replacement backplate or wiring base

Replacement backplates and wiring bases may not always be listed as self-serve products on getmysa.com.

  1. Contact Mysa Support if you need a replacement backplate or wiring base.

  2. Include your thermostat model, order number if available, shipping country, and a photo of the part you need replaced if possible.

  3. Support will confirm availability and provide the next steps for purchase or replacement.

Need help confirming what part you need?

If you are unsure whether you need a C-Wire Power Adapter, a trim kit, or a replacement backplate/wiring base, contact Mysa Support with photos of your current thermostat wiring and the Mysa model you’re installing.