I currently bought a Ring Doorbell and am trying to locate my transformer that powers it since it is unable to activate my indoor chimes. I'm in a condo and do not have access to the attic but do to the crawlspace.

I have a forced air electric furnace by the front door that is closest to the power panel but I cannot locate a transformer in or around it. About midway through my living room, under the stairs, is where my water heater is located. There, I found a transformer attached to where the water heater's power is connected. This is about 20 or 30 feet from the front door.

I turned the water heater off and the electricity test tool would still beep by the low voltage wires out of the transformer. I then turned the breaker off for the doorbell and it stopped beeping.

My questions are:

Is this uncommon for a transformer to be located so far from the doorbell and thermostat?

Can a doorbell and thermostat share a transformer?

I'm not convinced there isn't a hidden transformer maybe in a wall but both my thermostat and doorbell only have a small hole allowing the wires to come out. My next steps might be to cut the drywall out a bit behind the doorbell, but any suggestions would be greatly appreciated!


  • can you get the door bell to make a noise by reconnecting everything to the way it was?
    – jsotola
    Commented Jan 6, 2021 at 2:43
  • Yes it seems to work find if I remove the Ring and put the old doorbell back on it. Commented Jan 6, 2021 at 3:02
  • 1
    then disconnect the wire from the transformer ... the doorbell should stop working if the transformer is for the doorbell
    – jsotola
    Commented Jan 6, 2021 at 3:04
  • @jsotola that should be an answer, I would make sure that when sizing the new transformer to add 30va to the existing one incase it has multiple loads that is unusual but I have seen it a few times since only 1 set of wires it probably goes directly to the chime unit.
    – Ed Beal
    Commented Jan 6, 2021 at 14:50
  • @EdBeal what i wrote is just a suggestion ... it is not an answer to either of the two questions
    – jsotola
    Commented Jan 6, 2021 at 15:55

3 Answers 3


The simple answer to your questions. Is it uncommon for the transformer to be mounted so far away from the door bell and thermostat. The location is not specified in code and many contractors locate them at or above the chime unit or in an water heater / furnace closet. So it is not unusual.

Can a door bell and thermostat share a transformer? Years ago it was not something I have seen pre 1980’s, As we get into the y2k era I have seen furnaces and door bells sharing transformers more often and there is nothing in code stopping this.

I would do what @jsotola suggested and pull one side of the transformer red or white it won’t matter see if the doorbell still works if not and it will after reconnecting you can be 100% sure that is the correct transformer.

Get a larger transformer same voltage but more VA to run the ring I thought I have read 30va was enough so if you have a 20 get a 50 or with 2 doorbells converted to ring 80 or 100va as long as the voltage is correct it will not hurt to go bigger or as big as you may foresee using.

  • Thanks Ed, will try that and update the thread. Commented Jan 6, 2021 at 16:43
  • You are correct in that a higher capacity transformer will not hurt. If you need only 20 VA and you have a 100 VA transformer then that will work just as well as a 20 VA transformer. That is until there is an added load, then the 20 VA transformer isn't big enough any more and needs to be replaced.
    – MacGuffin
    Commented Jan 6, 2021 at 17:33

Thats definitely a transformer, but probably not for you door bell. The wires from a transformer to the door bell button are commonly 18-22 gauge solid core wires. There's a red and a white wire in a brown protective sheathing. The transformer will be installed like the one in your photo and will be labeled that is stepped down from 115V AC to 15-34V AC.

The bell transformer is commonly installed close to the door, but also where ever a discrete power source is available (ie closets, cupboards and such).

Look for your chime device it may be built into the door chime enclosure.

Turn the breaker off for the transformer in photo #3. Check for AC voltage. If there's no power disconnect the (2) wires shown in the photo. Cap or tape each wire. Switch breaker back on. Ring the door bell. "Ding-Dong?" Not the transformer for the bell. "No sound?" That's the one.

  • Great idea, will try it out and let you know! Commented Jan 6, 2021 at 5:30
  • I have installed hundreds of doorbells with bare not shelled or otherwise covered twisted red and white wire so I would disagree. The most common space is above the chime in the attic or behind it, next most common space is the furnace closet on a ranch style home.
    – Ed Beal
    Commented Jan 6, 2021 at 14:46

There are some intercom systems that have one transformer serving multiple doorbells with a common central unit. The transformer can be quite far away. These are common in condos.

Only solution I know is to get a an electrical tracer and attach it to the wires coming out of your doorbell.

See this question for more details: How do I find the master unit for an intercom?

  • Thanks, that's a good idea. I've needed to buy one anyway! Commented Jan 6, 2021 at 5:31

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