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  • Overview
  • Specifications
  • Reviews
  • Answers
  • Not all transformers are equal. NuTone transformers feature an easy-to-install lock-mount or wall-mount that can reduce installation time by 25%. An additional unique feature is the thermal cut-off switch designed to shut off the door chime system in the event of excessive temperature. NuTone saves you time and money!

    • 16-volt, 10VA transformer for use with most NuTone door chimes; order in standard package of six to help assist with your planning and still retain that economical edge
    • Quick install transformers, built to last so you should have fewer call backs
    • One 16-volt, 10VA transformer needed for a single chime
    • cULus Listed for safety, ensuring you have a quality, reliable transformer that will pass inspection
  • cULus ListedYes
    Product Depth (inches)1.775
    Product Height (inches)2.312
    Product Width (inches)2.312
  • C905 is rated 5.0 out of 5 by 2.
    Rated 5 out of 5 by from Works like a charm This product is a replacement after the original failed because of a faulty door bell button. Since it is a replacement it fits perfectly unlike some products that we have purchased only its better this replacement has two tones. We certainly appreciate that feature now we don't have to check which door the individual is at.
    Date published: 2017-11-11
    Rated 5 out of 5 by from Excellent tone. This brand was extremely reliable during 43 years at another house before making this selection for a condo remodel.
    Date published: 2016-04-30
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  • mounting in a metal box

    I had a c905 transformer fail. I noted that it says it is to be installed in a metal box. This one was not, it was in a plastic box. Does the metal box act as a heat sink for the transformer or is there anothe reason for this requirement?
    Asked by: ding dong
    I just called Nutone tech support. Only the C915 is listed for installation INSIDE any sort of box.
    Answered by: BostonSparky
    Date published: 2014-06-28

    Is the output ac or dc?

    Asked by: briano216
    Thank you for your question on the model C905 transformer. The output on the C905 is rated for 16 volts AC.
    Answered by: NuToneCustomerService
    Date published: 2016-03-30

    Allowable distance from the door chime LA14WH?

    If we install this down the hall from the LA14WH, what is the maximum distance we can run with the 16V current using 23AWG wire?
    Asked by: bell
    Thank you for your question on the model LA14WH door chime and C905 transformer. The voltage drop over a 23 gauge wire is pretty high, so it would be best for the transformer to be within 10 to 15 feet of the chime. We normally recommend using at least 18 gauge wire for these installations.
    Answered by: NuToneCustomerService
    Date published: 2014-09-12

    How can I make this door chime louder?

    Asked by: Vince
    The model listed is the C905 transformer. If you have a specific chime model, please contact the Technical Service Group at 888-336-6151 for assistance. Installing multiple chimes in the residence with the stronger C907 transformer would help or choose a chime that has a longer ringing chime like LA174WH Westminster model.
    Answered by: NuToneCustomerService
    Date published: 2016-11-02

    Is Yellow Tape Needed?

    I removed the yellow tape on this transformer and everything is still funtioning properly. Do I need this tape? What is the purpose of the yellow tape? Thanks!
    Asked by: Mark
    Thank you for your question on the model C905 transformer. The yellow tape is something the manufacturer puts around the laminations when it is manufactured. There is no problem with removing it.
    Answered by: NuToneCustomerService
    Date published: 2016-01-29
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