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

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Code 11 water heater comes on for short period and shuts off

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This is a tricky one, it means no ignition,which could just be a dirty flame sensor, low gas pressure, or no spark to ignite the burner. sorry but this one requires a rinnai trained service man

Posted on Oct 23, 2010

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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

Code 11


Before calling service technician, open following links for Rheem troubleshooting resources including error codes.
Error codes are considered start-point for troubleshooting.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://waterheatertimer.org/pdf/ErrorcodeTroubleshooting.pdf

Error 11 is no ignition.
This problem can probably be solved by routine yearly maintenance shown in instruction manual which recommends: Yearly cleaning, adjustment and inspection of burner and combustion parts.
The yearly maintenance would check incoming gas supply, venting, wiring and grounding, and burner and ignition parts.
All gas water heaters today require same maintenance: tankless require yearly, and tank-type require periodic (1-3 years)

Jul 03, 2011 | Rheem Tankless Hot Water Heater...

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THE Indoor tankless heater will turn on(with hot water on), light the priority light for 5 seconds, then the light will go off and the control reads a C2 11 error code. can you email me the 11 page...


Before calling service technician, best way to approach this problem is to contact Rheem with your specific model and serial number.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Error codes are starting place for troubleshooting.
C2 11 is gas and ignition related.
The same symptoms on your tankless unit can have different cause and solution than another tankless unit.

The burner might need to be cleaned.
Undersized gas meter, or low gas pressure should be checked.
Air in gas line.
Short circuit in gas solenoid.
Bad igniter.
Igniter wiring harness.
Tankless is not grounded.
Vent exceeds allowable height or length limit

All gas water heaters require periodic maintenance.
The manual is a good place to start for advisories and troubleshooting and required maintenance.
Tankless water filter should be cleaned monthly, and heat exchanger de-limed yearly.

Upvote the help.
And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

May 19, 2011 | Rheem Paloma PTG-74PVN / RTG-74PVN...

1 Answer

I have a richmond tankless water heater RMTG-74PVN-2 . the unit works most of the time but code c-2 comes up on the display and the unit shuts down. I shut the power off to reset this does not fix the...


I have a Richmond tankless water heater PTG2-42PVN. It will work for a very short time & then I get an error code of either C4 or C7. The remote control alternately flashes IL - 120

May 16, 2010 | Rheem Tankless Hot Water Heater...

1 Answer

I have a RV Atwood water heater and it ignites and starts ok but shortly thereafter it shuts off. I wait a minute or two and it restarts but shuts off again. Could it be the circuit board, or the sensor in...


You may have a control board issue, there is no sensor that is IN the water tank your thermostat controller are exterior to the tank under the black foam looking piece which I think is where your trouble lies

Feb 19, 2010 | RTO Atwood DSI-RV Water Heater-6 Gallon

1 Answer

My water heater cuts of after 30 seconds and shows C2, 11 code


sounds like your gas lines are too small or not enough pressure... or you may have to clean the rods

Jan 13, 2010 | Rheem Paloma PTG-74PVN / RTG-74PVN...

1 Answer

Noritz Tankless error code 16


The trick with these hot water heaters is to keep the filter screen clean and flush the system with CLR periodically. Code 11 is ignition error. Is your gas valve turned on?

Oct 17, 2009 | Noritz 6.9 Gallon Residential Direct Vent...

1 Answer

Noritz tankless water heater gives error code 11


This worked for me in the same situation. There is a filter inserted into main gas/ water control valve that senses water flow restriction. The sensor is connected to the gas valve. If it senses inadequate water flow it tells the gas valve to shut down so the water in the heater won't boil. Very expensive part. If you do find the filter clogged, a sediment water filter shoud be install on the inlet side of the water piping.

Oct 12, 2009 | Water Heaters

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