Question about Rinnai Digital Remote Water Heater Control Mcc-45-4us

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Rinnai C85 doesn't quit running. It's been running for 1 hr. straight. Only stopped after I turn the switch off and back on again. I wasn't using any water during this time.

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There is no water leaking any where on the hot side any where> Is the burner runnig or is it just the fan? if it is the fan the circuit board could have a defect if it is the burner the control is what is bad

Posted on Jun 06, 2009

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Posted on Jan 02, 2017

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Rinnai RC98i Error 12 - Flame Failure


IF THIS UNIT HAS SPARK IGNITION THE IGNITORS ARE PROBABLY OUT OF ADJUSTMENT WHICH IS LIKE HAVING TO WIDE OF A GAP ON A SPARK PLUG . IF YOU MAKE GAP OF IGNITOR ELECTRODES APPROXIMATELY 1/8TH OF AN INCH APART IT SHOULD LIGHT AS LONG AS YOU ARE GETTING VOLTAGE FROM IGNITION COIL. CALL A SERVICE TECH

Dec 22, 2013 | Rinnai RC98i Tankless Water Heater 9.8 GPM...

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All taps connected to my Rinnai XR20 run only luke warm when first turned to their hottest setting. In order to get truly hot water, I need to turn the temperature lever back and forth, from hot to cold,...


Hi, try turning up your temp setting in your rinnai. Also , it may take a few seconds to get hot water if the tap is quite a way from the hwc.

Sep 25, 2013 | Water Heaters

1 Answer

Water does not stay hot


Had this trouble with a condensing boiler,water pressure was too low, also if thereis an adjustable stat try turning this up ?

Jan 26, 2013 | Rinnai RU98i-N Interior Natural Gas...

1 Answer

OUTSIDE GAS MODEL NUMBER c85, WATER IS NOT HOT TAN...


I have two C85 Rinnai and one is turned off because it leaked... the other one does not heat water... I have it set on 120.
Where can I download a repair manual on these? I am in Nicaragua and dealer wants to replace them or something.

May 20, 2010 | Rinnai Digital Remote Water Heater Control...

1 Answer

Rinnai tankless water heater


LC is the error code that you get when you have limescale buildup in the heat exchanger. You need to flush your heat exchanger. If you have the manual for your water heater, use it. The manual to mine is attached. The procedure for flushing it is covered on page 12. I suggest that you have a certified Rinnai plumber perform this task as it requires a ciruclating pump and some hoses that you need to connect to your water heater. If you don't perform this task, it is possible that you will need to replace your heat exchanger and this is not something covered by Rinnai's warranty.

Sep 21, 2009 | Rinnai Webstone The isolator EXP tankless...

1 Answer

Rinnai *85e remote hooked up no hot water and no reading on remot


did you turn the unit off before hooking it up ? Any function on a tankless rennai the pwer has to be turned off and the priority button has to be pushed in,, if you have the manuel it tells you haw to do this,,

Feb 24, 2009 | Rinnai Digital Remote Water Heater Control...

1 Answer

What does a "12" on my 96-140 F Degree Control mean?


I'm mr.grzz, thanks for your question,
A code 12 on your control pad has allot of different remedy's, here is a list,
First it means you have flame failure,
Check to make sure the gas is turned on at the unit, the meter, or tank,
Check for obstructions at the flue outlet,
did they check the gas pressure ?
was the gas line properly sized ?
did they use Rinnai venting materials and was it properly installed ?
was the condensate collar installed properly ?
did they double check to make sure vent lengths were well within limits?
did they verify the dip switch settings ?
is the unit properly grounded ?
check power supply for loose connections
check power supply for proper voltage and voltage drop
check to see if flame rod is connected, this would be my guess as to what your trouble is, flame rod could be out of alignment as well, not sensing the flame, the other thing would be the gas, air in the line will cause this too,
the flame rod needs checked for carbon build up,
I know thats alot of tech data, but for all intents and purposes it would be best if you called a service tech that is certified with Rinnai to come take care of you, if you call them tell them you have a code 12, and you have the possible causes, I hope this was of help to you, please write us back and let us know, again thanks for your question, mr.grzz

Jan 21, 2009 | Rinnai Digital Remote Water Heater Control...

1 Answer

I have a Rinnai tankless. The temperature fluctuates wildly


I think the dip tube in your water heater has failed, this is a plastic tube that goes in the cold side of your tank and forces incoming cold water to the bottom of the tank allowing hot water out at the top. When this tube deteiorates the incoming cold water mixes at the top of the tank causing the problem you have. the dip tube runs about 5 bucks but takes someone with pluming skills to install.

Jan 05, 2009 | Rinnai Webstone The isolator EXP tankless...

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