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Rinnai RU98 tankless. Coded LC00 (lime scale build up). I reset to LC01 to extend the operation until I could flush. Now that I have flushed I need to reset the fault. How do I do this?

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6ya6ya
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Posted on Jan 02, 2017

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  • 6 Answers

SOURCE: vinegar flush

You should not have to flush unless the code LC comes up. but here is the flushing diagram.

Posted on Aug 01, 2009

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  • 3 Answers

SOURCE: Our Rinnai tankless water heater is producing water as hot as pre

Power outage will reset Rinnai unit to that temperature. Read manual for more info.

Posted on Jan 26, 2010

  • 4 Answers

SOURCE: need instruction how to flush Rinnai tanklees hot water heater

Found this link on how to do it:

Hope it helps.

Posted on May 07, 2010

heatman101
  • 43501 Answers

SOURCE: i have a Rinnai tankless water heater. As fa as I

Hi,
There should be no valves....was water still coming through or had the coils totally plugged up before you tried to clean them? Even so, if you were very near plugged then the vinegar will brak loose some mineral and it will plug up...try reversing the flow a number of times to see if you can establish flow through the coils. I have had to do that sometimes because people waited too long before calling for a cleaning... there has been one occasion when a coil totally plugged on me when trying to clean it and I could not get it back open and had to replace it...
Also using compressed air may get the coil open so that you can get liquid through it again....

as you are finding out this type of cleaning can be very frustrating... don't give up too soon... keep working at it...

heatman101

Posted on Sep 16, 2010

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1 Answer

I have a wall mounted tankless water heater for


It's scaled
Do you have a softener? Water must be 15 GRS/PPM or less in iron and calcium. Hot spots in unit are boiling water and are causing the noises.
Descale and flush unit following Rinnai Specs and check water hardness for compliance with Rinnai standards because too hard an inlet water will VOID the Heat Exchanger Warranty (10 year).

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Thermostat flashes IL ? Model PTG-53PVN


http://www.palomatankless.com/owners/homeowner+trouble.lasso#28-11
The Controller displays error code "1L."
There is a build-up of lime in your Paloma.
Contact your plumber to service the Paloma by flushing out the lime.
Also search u-tube for flushing lime out of tankless.

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Will the Grundfos RCP-96 model work with my Rinnai tankless heater model # C85e-1?


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:
http://www.rinnai.us/documentation/downloads/U287-1833_VB_Series_R75LSi_R94LSi_R98LSi_Manual_EN_FR_EN_FR.pdf

It might seem that tankless promoters are CTA by failing to mention specific flow rate numbers.
I think tankless promotion is a definite overachiever, and vague flow rate is one tiny example.
It proves the necessity of reading whole manual and asking questions before buying a tankless.
There's another factor to consider:
All performance numbers are based on new products in ideal circumstance, and not based on a 4 year old product located in your home.

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
Lime scale does not flush out of tankless
Tankless must have water conditions with less than 11 grains hardness
"Savings falls far short of a payback," 'without comparing service costs'
http://www.pmengineer.com/Articles/Cover_Story/8cf9e86f7c298010VgnVCM100000f932a8c0____
geno_3245_197.jpg Sediment clogs tankless pressure sensor without softener.

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1 Answer

The flow is more than it used to be when the Rinnai was working fine with two faucets flowing probably triple the advertised flow rate now. It still cycles hot and cold every few minutes. Is build-up a...


when your tankless starts cycling hot and cold water, then there is probably scale buildup inside the unit.
flushing the unit will remove the scale and any other debris inside the unit.
you can do this yourself, do you have the instruction book that came with the tankless heater?
it is recommended to flush the unit once a year especially if you have hard water.
it takes an hour or maybe a little longer to flush the unit completely.

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takes a little time, and requires about 5 gallons of vinegar, and a small pump.

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Our Rinnai tankless water heater is producing water as hot as pre


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  • you have a lime controll issue , you need to flush the unit using food grade vinegar. go to the rinnai web site for instructions. it is a pretty simple solution they make a kit to flush your unit if it was installed with an isolation kit.

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