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How to fix Rinnai code 79

I understand code 79 is an internal water leak. We had a major rainstorm yesterday, so I'm guessing water got into the air vent. This is a brand new house, so there's little chance it's anything else. What's the fix for this? Do I need to just let it dry out, or am I going to need to spend $500 for a plumber to come out on the weekend to fix it?

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  • Bulldog9816 Jul 21, 2013

    Thanks, Brad! I kept checking throughout Saturday to see if it had dried out enough, but no luck. But by Sunday morning (about 1-1/2 days after rain ended), it was back up and running.

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  • Rinnai Master
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Let it dry out.
If it wont fire because of the error, try powering it off and back on. Also being new, it would be under warranty

Posted on Jul 20, 2013

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Where is the leak sensor located?


Rinnai V65iN Installation Instructions and Product Brochures . Please school to the bottom of this link. You find a directory which includes technical manuals and support. Provide the information. And someone will get right to you. You probably fixed it by now. Here is your sourcing.

Apr 28, 2014 | Rinnai V65i-N Internal Natural Gas...

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How do you fix rinnai tankless water heater code 79


Do not spend 500 on plumber to determine that condensate drain was not installed properly on vent line, and that acidic water from combustion by-product has been dripping down into tankless and burning hole through the special-alloy heat exchanger instead of going down into floor drain and corroding your plumbing pipes.
Do not spend hours fulfilling the required monthly and yearly maintenance, or spend money on service call each year to get the burner cleaned and gas pressure checked on your tankless computer that heats water...
Instead, fix any tankless problem, any brand tankless, same day do-it-yourself for $385, by replacing 1 part: the whole thing:http://waterheatertimer.org/How-to-install-gas-water-heater.html
Do not install tankless.
Gene

Jul 20, 2013 | Rinnai Water Heaters

1 Answer

What does code 79 mean for the rinnai RU98i? It is beeiping and flashing 79


There is water leakage internally. Possible tank or water inlet or water entering from the combo air inlet/exhaust pipe.

Jan 09, 2013 | Rinnai Water Heaters

1 Answer

Rheem-Tankless-water-heater I am showing a C2 then 11 flashing on my thermostate. what is wrong.


Before calling service technician, open following links for common error codes, Rheem chat, and possible manual.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://waterheatertimer.org/pdf/ErrorcodeTroubleshooting.pdf
http://waterheatertimer.org/pdf/Tankless-maintenance.pdf

Error codes are start point for troubleshoot.
C2 11 is 'no ignition' or 'gas shut off vale is not open'
Gas shut off valve handle must sit parallel with gas line.
This kind of error code can be air in gas line, improper grounding at electrical outlet, bad igniter, shorted solenoid, loose connections, etc.
Most tankless manuals recommend yearly service, and that type of work usually covers cause for most common error codes: for example checking gas pressure, gas line, air in gas line, clean and check burner and combustion parts and igniter, inspect that vent condensate is properly draining and vent has good draft, clean water filter, clean air intake, check for loose wires, delime heat exchanger, test outlet with circuit analyzer etc.

Aug 11, 2011 | Water Heaters

1 Answer

Our Rheem gas water heater was acting finicky a few months ago so we called the manufacturer and they sent us a new/replacement kit for the Invensys WIPER Electronic Control & FV Sensor. We replaced...


You're probably in for a service call and/or possibly water heater replacement if unit is more that 5-6 years old.
Your water heater plugs into outlet. Check outlet with cheap circuit analyzer to make sure the unit is receiving correct polarity without line interference.
If unit is in the attic, then add more venting to soffit and roof so pilot is not being snuffed out by hot air. If unit is in basement, then open some doors and a window and see if unit needs more air.
Most gas water heaters require yearly cleaning and service.
Clean the combustion parts and tubes.
Clean the air intake.
Have gas company check gas pressure.
Open following link for possible illustrations:
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot

The problem can be bad gas control valve, air in gas line, low gas pressure, gas shut off handle not fully parallel with gas line, dirty combustion parts, lack of combustion air, improper venting. Or combination of all things. It's an electronic gizmo, anything can be bad or shorted, and repair may not last long.

Without a trained service technician to ohm-test the parts using correct service manual, then we are guessing at the cause.

Power vent water heater implies that you have side wall venting which must be replaced with another side-wall vented unit -or- it implies rapid reheating of water.

If water heater is more than 6 years old, you might be money ahead by installing a new one from local box store. Avoid the power vent and electronics. Local box store will have passive roof-venting type water heater BUT box store does not sell side-wall power vent. If your power vent goes up through the roof, then box-store variety gas water heater will work. Total cost $350 do-it-yourself for 40 gallon gas.
Or get 40 gallon 240Volt electric for $220 and connect to circuit breaker box. Requires no venting, and is easy to repair for years to come.
Or small 120Volt electric that plugs into outlet to tide you over until gas repairs can be made.
Look for scratch-n-dent models and always offer 10% off.
http://waterheatertimer.org/How-to-install-gas-water-heater.html
Shower uses 5-9 gallons hot water.

Aug 01, 2011 | Rheem Water Heaters

1 Answer

Having problems with models sutting down. Relates to combustion shut off system. Explain how system works, with corrective action, especially draft system. Pilot ignites, burner operates for second or two...


As a general rule with Rheem gas water heaters, the manufacturer suggests calling trained service technician and their products do not have specific service bulletins.
I cannot explain combustion shut-off adequately. Post question on water heater forum.
http://www.thetankatwaterheaterrescue.com/forums/

Most likely the combustion and combustion parts need cleaning and maintenance, as a start point.
Gas water heaters today require yearly cleaning and maintenance.
That work would cover possible causes and combination of causes: from air in gas line, faulty venting, inadequate air supply, dirty parts, overheating, leaks, exposure to chemicals, corrosion, faulty gas control valve thermostat, sediment build-up.
You have a standing pilot light that is working, so gas supply sounds correct, and ECO is not tripped, so cleaning is major suspect right off.

Light a match under the vent hood and check if smoke drafts immediately upward.
Your water heater vent has a natural upward draft that pulls combustion by-product upward so the poison gas is vented outdoors to kill the world slowly instead of remaining inside the house. If vent is clogged, the air flow might not support combustion. Likewise if water heater does not have adequate incoming air supply, for example a tightly sealed house, then combustion is not supported. Also if you store bleach and pool chemicals and other assorted chemicals in trace amounts in same room or nearby, the burning chemicals will corrode combustion parts so they no longer perform.
http://waterheatertimer.org/images/Test-water-heater-vent-400.jpg

See general illustrations for cleaning combustion parts, and read 2 pdf files about cleaning typical gas water heaters.
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot
http://waterheatertimer.org/9-ways-to-save-with-water-heater.html

Read Reliance gas water heater handbook. It may or may not apply to your circumstance and heater.
http://waterheatertimer.org/pdf/Reliance-2006-Service-Handbook.pdf

Jul 11, 2011 | Rheem 30 Gallon FVR NATGAS Water Heater...

1 Answer

I have a Jayco pop up with an Atwood water heater, serial # 37C14U-5. My problem is two-fold. The water heater pilot doesn't stay lit after initial run, and propane is leaking out of the vent on the...


Leaking propane is red flag #1 and fire hazard.
Immediately update your insurance and then turn off gas.
If pilot is not staying lit, then gas leak can be cause of pilot problem since pressure on the line is reduced.
Other causes include bad gas control valve, air in the gas line, bad thermocouple, burner parts need cleaning, or all the above.
After fixing leak, replace thermocouple, clean combustion chamber and burner parts, and bleed gas line to remove air.

More resources:
http://waterheatertimer.org/Atwood-water-heater-resources.html

Jun 28, 2011 | RTO Atwood Water Heater - 6 Gal LP

1 Answer

Can we install a a ptg 74pvp tankless hot water heater in a closet? Would we need to install grating in the closet wall to provide more fresh air?


Rheem Tankless Water Heater Selection and Installation Videos
  • Introduction - time 04:11
  • Pre-Qualifying the installation - time 01:13
  • Selecting the Right Product - time 01:48
  • Key Differences Between Tankless & Storage Heater- time 01:27
  • Choosing the Location - time 01:20
  • Installation: Major Components - time 00:58
  • Installation: Tools Required - time 00:48
  • Installation: Mounting the Heater - time 01:15
  • Installation: Plumbing & Gas Connections - time 04:29
  • Installation: Side Wall Vent Termination - time 02:41
  • Outdoor Installation - time 01:21
  • Connecting the Remote Control - time 01:42
  • Turning on the Water Heater - time 01:00
  • Commercial vs. Residential Products - time 01:47
  • Manifolding Multiple Units - time 01:43
  • Troubleshooting & Additional Support - time 01:01

Feb 02, 2011 | Rheem Tankless Hot Water Heater...

1 Answer

When the hot water heater is running water leaks from the chimney. the pipe from the heater to the chimney is dry upon removal. about 3 gals. of water leaks from the chimney with two showers.


If I understand correctly, your Bock gas water heater vent is causing water to leak down into chimney.
This is a very serious concern

Water leaking from water heater flue indicates improper venting.
The hot air gasses from water heater combustion contain water vapor, but the gas should vent out of house before condensate forms on pipes.
http://waterheatertimer.org/Water-at-bottom-of-water-heater.html#flue

The problem might be caused by a power vented furnace that pushes vent air from furnace down into flue pipe for water heater. As a result, the water heater doesn't vent properly.
There could also be a clog.
Light a match under water heater draft hood and see if smoke from match travels instantly upward.

There are two major concerns.
1) If vent is not working, it means that odorless CO gas is entering home instead of venting outdoors.
CO carbon monoxide is deadly poison.
http://en.wikipedia.org/wiki/CO_poisoning
This is a very serious concern
You can buy CO detector after vent is repaired.

2) Water condensate will eventually rust away vent pipes because of acidic content of the combustion vapor. It can be expensive to replace pipes, and pipes with holes pose risk of CO poisoning.

My suggestion is call a qualified plumber ASAP and explain what you observe.
Plumber will want to inspect the vent pipes, and may want to extend water heater vent pipe up further inside chimney so furnace is not pushing air back into water heater vent.
Plumber may also find blockage somewhere in the vent stack or chimney.
Also post on a professional water heater forum like the Tank to double check anything the plumber says to you. These are the pros.
http://www.thetankatwaterheaterrescue.com/forums/forum3/

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5 Answers

Tankless water heater error code 11


I was having the same problem untill I reallized it was my venting system. Test the water heater with no vent on top. Disconnect the vent pipe from the water heater and try turning on the hot water. the water heater needs a special adapter to vent the direct vent water heater. One other thing you can check is the gas pressure in your home. You have to have between 7 and 8 WC (water Column) for the tankless water heaters. You can call your gas supplier to find out what you have.

Apr 12, 2009 | Rheem RTG-66DVN Direct Vent Natural Gas

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