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Have new Rinnai R94LSI tankless water heater during startup the burner wll come on for about 1-2sec.then stop and gives me a erroe code 12.

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  • tpate406 Jan 05, 2009

    thanks looks like a service call.

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Hi!!! you seem to have a bad flame sensor..but you could have so many errors with this heater its unbelievable call rinnai at 1-800-621-9419..good luck..

Posted on Jan 04, 2009

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1 Answer

Rinnai tankless hot water heater


Try replacement valve or solinoid for it on Ebay, or MFG website, or their customer service web site. They may not help due to critical safety issues with DIY fixes.

Apr 14, 2015 | Rinnai R94lsi Tankless Water Heater-...

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Rinnai Trouble Shooting


Clean water filter.
Delime heat exchanger.
http://waterheatertimer.org/How-to-delime-tankless-water-heater.html
Add tempering tank to preheat cold incoming water.
http://waterheatertimer.org/Tempering-tank.html
Check for bad single-handled faucet cartridges.
http://waterheatertimer.org/Crossover.html
Don't install multi-sensor computer-chip water heater to water lines and gas line and vent pipe since tankless will develop unsolvable problems.
Contact Rinnai and hear them tell you to call service technician, only to discover there are no qualified service technicians in your area who might be able to solve problem. 1-800-621-9419
Ask why the Rainnai site has much promotional information and no service manuals. Nor does Rinnai offer forum where tankless owners can freely exchange their endless unsolvable problems for all to see.

May 16, 2013 | Rinnai Tankless Water Heater R94lsi W/...

1 Answer

RINNAI R94LS CONVERT TO NATURAL FROM PROPANE


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Electric Water Heater List Reviews waterheaterlist com

Jan 28, 2013 | Rinnai R94LSi Tankless Water Heater...

1 Answer

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.

Dec 28, 2010 | Grundfos RCP-96 Recirculation Pump for...

2 Answers

My new tankless WH stopped working. It gives hot water for about 15 sec, then starts flashing C7 12 or C2 11. How can I fix this, We had it for a month now & it worked before.


11 The Gas Shutoff Valve is not opened
completely.

12 Gas Service has been interrupted.
LP Gas is running low. (LP models only)

I think C7 is where the startup sequence ended...and then you get the error code

If less than a month old...contact your customer support

Nov 01, 2009 | Rheem EcoSense by 7.4 GPM Outdoor...

1 Answer

Rinnai Tankless won't stay on


how far is the tankless from the gas meter? error code 12 means it doesn't have enough gas running to it. is the 3/4 flex true 3/4 or is it 1/2 with 3/4 threads. have you checked your BTU load on your house to make sure your 1'' pipe can handle everything else you have on the house? sounds like to me you dont have the right amount of gas to the unit.

Sep 29, 2009 | Rinnai Webstone The isolator EXP tankless...

2 Answers

Rinnai r94lsi comes on 5 sec. then off


if it's a gas unit you mite have to bleed the gas line in and out.

Jan 04, 2009 | Rinnai Webstone The isolator EXP tankless...

4 Answers

Rinnai tankless water heater code 12


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

Dec 31, 2008 | Rinnai Webstone The isolator EXP tankless...

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