Question about Rheem Tankless Hot Water Heater Rtg-74pvp-2 7.4 Gpm

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

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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

Posted on Jul 31, 2009

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Posted on Jan 02, 2017

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1 Answer

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


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

Nov 18, 2014 | Paloma Tankless Water Heater Digital...

1 Answer

Thermostat model UMC 117 keeps coding C7 why?


Generally, C7 is communication problem with remote
Error codes are considered start point for troubleshoot.
Causes can be: Bad remote, bad wire to remote, loose wire connection at remote, loose wire connection at unit, bad PC board.
In no particular order:
Check wire connections.
Disconnect remote and let water heater control temperature at default 120 degrees F, and if no further problem develops, then that might eliminate PC board as source of problem.
Replace wire to remote.
Replace remote.
Call service technician to diagnose problem.
Contact Rheem about PC board and other options.

Before calling service technician, open following links for troubleshooting resources:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://waterheatertimer.org/pdf/Tankless-maintenance.pdf
http://waterheatertimer.org/pdf/Rheem-error-code-C7-76.pdf

Aug 14, 2011 | Rheem Tankless Hot Water Heater...

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

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...

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