I am replacing my ring doorbell with a Unifi G4 Doorbell and when I hooked it up, I was alerted that the power was too low. Through some searching I discovered that I need to replace my transformer.
I spent a long time looking for my doorbell transformer and was unable to locate it. I found one attached to my furnace, but I assumed that transformer was specifically for the furnace. See the picture below for how this is hooked up. But I went ahead and flipped off the breaker for the furnace and the doorbell stopped working as well.
So my first question is whether this is the doorbell transformer, or if it's potentially shared as both the doorbell and thermostat transformer and how I could further test that. If not, are there any tips on locating the doorbell transformer?
If it is the right transformer, how do I go about replacing this?
I went ant tested the voltage with a multimeter and it came in as 21.2V
I tested flipping off the power to the furnace (The furnace switch is attached to the box in the picture). My thermostat reported no power on the red wire, but this transformer reported 21.2V still. This feels like more confirmation that this is for the doorbell.