Question about Paloma Tankless Water Heater Digital Control UMC-117

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How do i change the temperature range from 140 deg to 180 deg in the UMC-117 controller?

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Why would you want to use it at 180' unless your using it for a dishwashing application.

Posted on Nov 19, 2014

Testimonial: "I am using it for a home heating system."

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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

I have a Rheem EcoSense tankless water heater that I want to set the temp to 140degF. How do I set it internally for this?


1) The best place to find this information in your manual.
Typical Rheem manual in my files shows temperature is adjusted by pressing UP and DOWN temperature buttons on remote.

2) Manual says: Temperatures of up to 140°F
(60°C) for Light duty models and up to 180°F
(82°C) for Heavy Duty models can be
achieved with the MAIN (UMC-117) remote
control and a dip switch adjustment. Only
qualified service personnel should perform
this adjustment. Only factory authorized
remote control(s) should be used.

3) Typical manual shows information on page 22-23. Search pdf for 'temp'
http://waterheatertimer.org/pdf/Rheem-RTG74IndoorOutdoor_owners.pdf

4) This information squares with what I heard before that trained service technician is needed to adjust water temperature.
I think Rheem does this since tankless will not achieve that rise in temperature if incoming water is cold.
BTUs put out by tankless burner has limit.
If incoming water is colder than certain temperature, then tankless cannot raise temperature quick enough as water passes through burner.

5) You might also need a tempering tank, to modify cold water in winter:
http://waterheatertimer.org/Tempering-tank.html

6) Suggest you also read the yearly maintenance required for tankless.
For example tankless are prone to lime build up and need to be de-limed each year with vinegar.
Lime build up will certainly affect water temperature.

7) Following 2 links might be helpful for tankless owner:
http://waterheatertimer.org/pdf/Delime-tankless-water-heater.pdf
http://waterheatertimer.org/pdf/Paloma-Tankless-Error-Codes.pdf
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Add a comment for more free help.
Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Mar 04, 2011 | Rheem Tankless Hot Water Heater...

2 Answers

Rheem tankless heaters, unlock 140f limit


THIS MAY NOT BE SAFE TO DO YOU CAN CALL THE MAKER

Jan 07, 2010 | Rheem Tankless Water Heater Main Remote...

1 Answer

The UMC-117 shuts off during water heat up. What


overheat stat first then check fan best of luck

Oct 10, 2009 | Rheem Tankless Hot Water Heater...

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...

1 Answer

My rheem umc-117 controller flashes an IL code.


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

Jun 27, 2009 | Rheem Tankless Water Heater Main Remote...

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