Question about Rinnai Webstone The isolator EXP tankless water heater Service Valves WRIK

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Rinnai tankless water heater code 12

My gas water heater won't fire up and flashes code 12 on the screen. I need a list of trouble codes to find out what this means.

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  • Anonymous Mar 26, 2014

    fault code 11 on rinnai tankless water heater ,tries to fire but it kicks out. has done this in the past but then started working on its own.what is the most common problem with this fault code?

  • Anonymous Mar 27, 2014

    Loud humming sound from rinnai thankless heater

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12 - Flame Failure or Poor Ground

1. Immediate code 12 is usually a defective gas valve, power supply problem, or defective fan motor wiring harness.

2. If code 12 occurs after a few seconds it indicates that proper operation was established, but then stopped unexpectedly.

3. Verify that fuel is being supplied to the unit.

4. Check for proper electrical ground. Unit must use a grounded power supply.

5. Check for flue blockage on inlet or exhaust.

http://www.foreverhotwater.com/service-codes.php

Posted on Dec 31, 2008

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I have a rinnai tankless water heater
the gas valve has been replaced
the problem only occurs in the summer in the heat of the day
the heater shuts off and a code 12 appears
when the unit is turned off and then back on all is fine for a while
the unit sets inside the garage and is vented out the brick [horizonally] about 2'

Posted on Jul 30, 2009

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Code 25. Condense trap is full. What does that mean?

Posted on Dec 11, 2017

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Check your vent pipe to make sure air inlet side is clear and interior Metal piping is connected together thru out to prevent air discharge and air intake from cross contamination , this causes unit to function during slow flow rate ( lav ) but show 12 code during higher flow rate usage (tub ).

Posted on Jul 27, 2013

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Check any other appliances that run on gas during that period...might have a problem with a regulator outside. Sometimes if they are exposed to direct sunlight, the metal inside can expand and stick. Usually they will hum occasionally when warm under heavy load

Posted on Sep 14, 2009

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Posted on Jan 02, 2017

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You probably have tankless water heater.
What brand water heater?
Gas or electric?
Is this new installation or old installation?

For Rheem tankless:
Copy following link: If you get no error code on remote control, then scroll down to 'no error code.'
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

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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.

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Mar 09, 2009 | Rinnai Webstone The isolator EXP tankless...

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

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