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Priority light is on - Noritz RC-7649M Remote Control

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I have a Rinnai RL 175 Tankless water heater. I just moved into the house two weeks ago. We have no hot water. Green priority light and beeping sound came on. Breaker also flipped on panel. Any ideas?

Usually, Breaker tripping indicates a hard short ... probably the heating element is shorted and needs replacement. Possible bad C/B but don't think so.
Good Luck! handy Henry.

Feb 14, 2017 | Rinnai Water Heaters

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Beep codes

Get the manual for it on line and look up the beeping meaning and the reaqon for the priority lite.

May 24, 2013 | Rinnai Water Heaters

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THE Indoor tankless heater will turn on(with hot water on), light the priority light for 5 seconds, then the light will go off and the control reads a C2 11 error code. can you email me the 11 page...

Before calling service technician, best way to approach this problem is to contact Rheem with your specific model and serial number.

Error codes are starting place for troubleshooting.
C2 11 is gas and ignition related.
The same symptoms on your tankless unit can have different cause and solution than another tankless unit.

The burner might need to be cleaned.
Undersized gas meter, or low gas pressure should be checked.
Air in gas line.
Short circuit in gas solenoid.
Bad igniter.
Igniter wiring harness.
Tankless is not grounded.
Vent exceeds allowable height or length limit

All gas water heaters require periodic maintenance.
The manual is a good place to start for advisories and troubleshooting and required maintenance.
Tankless water filter should be cleaned monthly, and heat exchanger de-limed yearly.

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 19, 2011 | Rheem Paloma PTG-74PVN / RTG-74PVN...

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I have a Rinnai MC-45 US. One morning, we had no hot water & the temp on the control panel read 12. So I pushed the Priority button. We now have hot water, but the priority button is still lit. It has...

Error code 12 can sometimes be caused by a short circuit on the low voltage side of the installation. Could possibly be a fault with the controller itself which is low voltage.

Jan 31, 2011 | Rinnai Digital Remote Water Heater Control...

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My o69m flashes a 16 and says priority

The 16 error code occurs when the outlet temperature exceeds the set temperature of the unit. Typically this occurs when the unit has developed scale in the heat exchanger. I would initially recommend performing a descale on the unit to remove any scale deposits from the HEX.

Aug 31, 2010 | Noritz 6.9 Gallon Residential Direct Vent...

2 Answers

Wiring a smart control to a taco sr504 to a honeywell L7248.

Set tempture up some so the water will be hoter.

Mar 18, 2009 | Water Heaters

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