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How to change the thermostate on my Rinnia Energysave 556 WT heater

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The thermostat on the unit is located in the lower right hand side of the unit behind the trim panel closest to the wall. Look for a yellow wire with a black rubber bulb on the end. It will have a few feet of extra wire tied up in the heater itself and allows you to raise it to get a better more accurate reading. To change it, you have to unplug it from the PC board and plug in the new one. You can not use a conventional thermostat on a Rinnai heater.

Posted on Mar 17, 2011

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  • oomwoc1 Apr 28, 2011

    Hi, our heater reads the room temp as much higher than the actual room temp, would changing the thermostat as you have described above help this issue? Thanks :)

  • Chandler Ede
    Chandler Ede Apr 28, 2011

    I would lower it. If that does not help, order a new one from Rinnai. They are easy to replace. Good luck!

  • oomwoc1 Apr 29, 2011

    It helped a great deal! Thanks!

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