Question about Rheem Tankless Water Heater Main Remote Control

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The Rheem UMC-117 starts blinking and reading c7 76 no idea what that is and not sure how to reset it and get it to work correctly also what do the other settings stand for

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The 76 code means that the controller is bad or the wiring. unplug it and see if it works ok. if it doesn't let me know

Posted on Jul 29, 2009


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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.
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.

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.

If you need further help, I’m available over the phone at

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

1 Answer

Have a rtg66dvn wont fire up led blinks 4 times intermittently. My umc-117 remote will not power up? Does this have a battery? Please tell me what can be the problem... thanks

Before calling service technician, open following link for Rheem troubleshooting resources including link for Rheem chat. They require model and serial number and may ask for the person that installed unit, and current service technician working on problem.

Normally you get error 76 when remote cannot communicate with tankless unit.

Use and care manual says do not take apart remote control.
The remote is connected to water heater with a wire, max distance 195 feet, so there is no battery.
Check that outlet supplying power to tankless is working.

New UMC-117 remotes sell for about $99.00.

The symptoms on your tankless could be anything from loose wire to bad PC board, or innumerable other issues including bad sensors. Or it could be something very simple. The same problem on your tankless unit might have different cause and solution than another tankless unit because so many internal and external factors affect these sophisticated machines.

Read your use-and-care manual and make sure that maintenance is done regularly. For example water filter needs to be cleaned monthly and heat exchanger de-limed yearly. The manual is fairly long but should be read entirely to best understand the complexity, and general advisories.

Upvote the help.
And 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.

May 13, 2011 | Rheem Tankless Water Heater Main Remote...

1 Answer

Why is the controller UMC-117 keeps blinking c8?

C-8 error codes could mean anything from the fan not starting, a bad control board, or a blown capacitor. Best bet would be to call Rheem customer service and they'll ship part or suggest licensed contractor to troubleshoot and replace what's necessary.

Open following link to view fixya questions on 1 model of Rheem tankless
Some older questions have information that is useful, and varied

Open typical manual to review required regular maintenance for tankless on page 29
The word maintenance is used throughout manual, indicating that tankless are a yearly budget nuisance

All costs are money.
You can also add simple tank-type water heater that can be turned on when tankless is on the blink.

Mar 02, 2011 | Rheem Tankless Hot Water Heater...

2 Answers

Rheem tankless heaters, unlock 140f limit


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...

2 Answers

Rheem tankless shuts down on it's own.

Check to make sure wire is solid copper thermostat wire and not stranded

Aug 15, 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...

1 Answer

No hot water from tankless water heater. Bliniking Readout

This is there website.Above.
Use the live chat to ask them, the code you listed does not seem to correspond to there code list, the only code that does is code 76,
which is a problem with the remote control not talking to the unit.
So your best bet is to tell them the error.

Apr 07, 2009 | Rheem Tankless Water Heater Main Remote...

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