Question about Rheem Tankless Water Heater Main Remote Control

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My rheem umc-117 controller flashes an IL code.

What is this and what do i do?

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  • 117 Answers

It means that you have lime build up in the heat exchanger and it needs to be flushed out ASAP!!

Posted on Jul 29, 2009

  • 1 more comment 
  • Mack Cuello Jr
    Mack Cuello Jr Feb 13, 2014

    I have back flushed the exchanger and IL still flashing.

  • Mack Cuello Jr
    Mack Cuello Jr Feb 13, 2014

    Is there a special cleaning solution required for back washing exchanger?

  • snap101
    snap101 Feb 13, 2014

    vinegar is the safest, Call rheem you probably have an old enough unit that it needs to have the scale code reset

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1 Answer

Why does remote UMC-117 flash error code 11 and then L1?


Multiple error codes can mean bad PC board.
C11 is combustion, vent or gas issues
L1, heat exchanger needs delime.
Catch unit up on required maintenance each year.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html#error

Gene

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Jun 17, 2014 | Rheem Tankless Water Heater Main Remote...

1 Answer

How to change from ºF to ºC on the UMC-117?


According to the 2012 manual, 'the LED display only shows F.'
Bottom page 65. Yet the F temperatures are also shown as C in the manual.
http://waterheatertimer.org/pdf/How-to-set-Rheem-tankless-temperature.pdf
You probably have different model, or older model?.?
Older manual (page 15) shows same temperature range with both F and C, but typical of Rheem, the manual is totally vague about settings and say that qualified tech needed to adjust temps beyond factory default range (with no mention of display showing C) ... which is safeguard since the damg product cannot always heat water fast enough to reach higher set points above 120F.
http://waterheatertimer.org/pdf/TanklessOutdoor_95_84_64X_UC_AP15318.pdf

Call Rheem 800-432-8373 and give your product serial number and model number located on side of unit, and ask them.

Don't forget to keep the product maintained to avoid common error codes.
http://waterheatertimer.org/pdf/Rheem-CondensingTankless-maintenance-2012.pdf

Aug 28, 2012 | Rheem Tankless Water Heater Main Remote...

1 Answer

Remote is flashing C8 and 76, alternating. I turn the unit off, then back on, and I get hot water for about 10 seconds, then it goes cold and the same error message occurs. Unit is Rheem Main Remote...


Before calling service technician, open following links for Rheem tankless resources including error codes and Rheem chat.
Disconnect wires from remote to see if system stabilizes. Unit will heat to default temperature without remote.

Error codes are considered start-point for troubleshooting.
C8 76 can mean PC board failure.
76 can mean communication failure with remote control
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://waterheatertimer.org/pdf/ErrorcodeTroubleshooting.pdf
http://waterheatertimer.org/pdf/Rheem-error-code-C7-76.pdf

Jul 31, 2011 | Rheem Tankless Water Heater Main Remote...

1 Answer

My umc-117 flashes 76 then -0 what causes it to do that?


76 is the controller error, check your wiring to it to make sure it is connected well , if it's not that the controller is shot , from there it could be the one of the control boards

Jul 30, 2009 | Rheem Tankless Hot Water Heater...

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