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Rinnai tankless water heater keeps beeping and showing LC

RINNAI TANKLESS WATER HEATER KEEPS BEEPING AND FLASHING LC WHAT DOES THIS MEAN? Thanks

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  • overheaddoor Mar 01, 2009

    My Rinnai is only 375 days old when it started beeping and it wont quit.I still get hot water,I just shut it off when I'm done running hot water.The sales man said there is a filter on the bottom somewhere but I cannot locate it.

  • overheaddoor May 11, 2010

    how do I flush it?

  • Anonymous Mar 12, 2014

    rinnai vent free heater is flashing code 14

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Time to flush it. LC indicates lime scale build-up.

Posted on Nov 28, 2008

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Go to Rinnai and get a manual with the error codes... for example a shorted element will trip breaker... wiring problems can cause breaker to trip... anything that causes heat on wire to exceed amp rating of breaker will cause it to trip...
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Controller not working


The rinnai is a computer that heats water. It is not ordinary water heater most people are familiar with, and repairs are not do-it-yourself, requiring a trained technician qualified in that brand who can diagnose both computer and water heater problems and plumbing problems.
Call rinnai for recommended local technician. Click on support tab. Note their webpage is very short on repair details, unlike companies that sell tank-type heaters... because tankless units are not do-it-yourself.
http://www.rinnai.us/tankless-water-heater
Problem might be simple blown glass fuse on circuit board or complete failure of computer and sensors.
Here is page written for Rheem tankless, that explains general complexity of tankless computers, and showing required maintenance, such as deliming each year:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
To save problems with tankless computers plus anticipated expense of maintenance and repairs, I recommend homeowner install tank-type gas water heater:
http://waterheatertimer.org/How-to-install-gas-water-heater.html
Also install one-time-use whole house surge protector, and install grounding rods to prevent further damage... lightning frequently likes the same places over and again:
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There is water leakage internally. Possible tank or water inlet or water entering from the combo air inlet/exhaust pipe.

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Rheem water heater manual model 81x52d


Our expert will provide you reviews regarding tankless water heater. If you are planning to purchase tankless water heater tank ,you must read about Tankless water heater from here. It will help you to know about which product is best suited for you. There are lots of reviews are available for you about different products.
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Grundfos RCP-96 has Flow range: 0 - 27.5 U.S. GPM
According to Amazon spec sheet:
http://www.amazon.com/Grundfos-RCP-96-UP515-55SFC-Recirculator-Timer/dp/B00128BJAO

Most tankless require .4 GPM to start burner and .25 GPM to maintain burner
Rinnai does not show C85e-1 so you will have to consult your manual to see minimum water flow requirement.
http://www.rinnai.us/tankless-water-heater/
Sample manual from Rainnai mentions 'minimum flow rate' several times but doesn't give specific number. Yet promotion blurb on page 1 says "Ultra operates at a lower minimum flow rate."
http://www.rinnai.us/documentation/downloads/U290-665x0200_Condensing_Manual_EN_FR_1-2010.pdf
Another rinnai manual mentions flow rate several times in troubleshoot section yet fails to define what that rate is:
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It might seem that tankless promoters are CTA by failing to mention specific flow rate numbers.
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It proves the necessity of reading whole manual and asking questions before buying a tankless.
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Your flow rate may vary, especially over time, and especially if water in your area is not crystal clear, and you are not diligent with correct water softener and filter.
Many factors can affect flow rates: water pressure, number of elbows, clogs in the line, sediment, size of pipe, aireators, water-saving shower heads, local water conservation policies, water well pressure, MUD district pressure issues, your home located near end of a water main, etc.

Read tankless efficiency vrs water softener
http://waterheatertimer.org/Battelle_Final_Report.pdf
Image of tankless parts vrs tank parts
http://waterheatertimer.org/images/Compare-water-heater-parts.jpg
Bradford White tankless vrs tank side by side
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"Savings falls far short of a payback," 'without comparing service costs'
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