Replacing old transformer


I have a RVD2. I replaced the old mechanical doorbell with existing wiring. I was having to charge the battery every 3 days because by then the battery was dead. I figured the transformer wasn’t strong enough so I bought a FCHO 24V 40VA Thermostat and Doorbell Transformer.

When I took off the old transformer, it had 4 wires, 2 red, 2 white. The reds were connected together and capped. The whites each went to a screw on the transformer.

The new transformer just had a black wire and a white wire with no instructions. I connected the white to a red and capped it. I did the same with the black wire. the other 2 white wires from the wall connected to the screws on the transformer.

Now, the RVB2 has been reading 23 % power for a day now. Is this correct or did I mess up the wiring?

Thanks in advance,


Good question @gjp1459! When it comes to installing or replacing a transformer, this is something we would advise consulting with an electrician for. Unless you are using our Plug-in adapter, a standard transformer will need to be installed properly for sufficient power.

Once installed, you will have 2 wires coming from your transformer to the Doorbell. One of these wires will need to be regulated with a wire-wound resistor as there is no longer a chime kit in place. These instructions can be found here.

If there are still outlying variables in your wiring configuration, I recommend reaching out to our support team, at 800-656-1918, for more in-depth troubleshooting. I hope this helps! :slight_smile: