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I am getting a beeping sound and error caode 11 on ours. It will not give out hot water. We had a technician look at it twice plus called the gas company but no luck. please help!!!

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  • Water Heaters Master
  • 5,089 Answers

11-2-12
Copy following links for Rheem tankless error code 11, and other useful resources.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://waterheatertimer.org/pdf/Tankless-error-code-11.pdf

Repair tankless water heater, any brand, same day, yourself for around $350 by replacing 1 part > the whole thing.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Posted on Nov 02, 2012

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  • 1 Answer

SOURCE: 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.

Posted on Oct 13, 2009

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1 Answer

BLINKING C2 AND 11


Before calling service technician, copy following link for troubleshoot resources:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

C2 11: failed ignition, clean combustion parts, low gas pressure, failed gas solenoid, failed gas control valve, loose wiring harness, sand carbon off igniter, etc

Tankless require monthy-to-yearly maintenance to avoid common error codes. The product manual recommends yearly service. Since Rheem does not post service manuals, you generally have to pay somebody to take apart and test the unit. The cost of this far outstrips expected savings from owning expensive water heater that requires lots of maintenance, yet is heavily promoted as the solution to water heater problems.

Never install tankless water heater is best way to avoid complications of expensive water heater that is maintenance heavy, hard to diagnose, expensive to fix, etc.
Never expose tankless to more than 11 grains hard water.
http://waterheatertimer.org/pdf/Rheem-CondensingTankless-maintenance-2012.pdf

Aug 25, 2012 | Water Heaters

1 Answer

Rheem Integrity 20 not always lighting. Showing code C2 11


Before calling service technician, open following links for Rheem/Paloma troubleshoot resources including error codes:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://waterheatertimer.org/pdf/No-Error-Code.pdf

C2 11 is no ignition.
Clean combustion parts yearly as recommended in manual is first step.
Other causes can be loose wiring, bas gas valve, dirty air intake, bad venting, bad sensors etc.
Test these parts using service manual. Call Rheem since Rheem does not post service manuals.

Oct 06, 2011 | Rheem Tankless Hot Water Heater...

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...

2 Answers

Error code 11


Before calling service technician, open following link for Rheem troubleshoot resources including error codes, Rheem chat, and possible manual:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Error codes are considered start-point for troubleshooting.
Error code 11 is No Ignition or inadequate gas, and can be air in gas line, bad gas solenoid, un-grounded appliance, bad igniter, damaged wiring harness.
http://waterheatertimer.org/pdf/ErrorcodeTroubleshooting.pdf

Tankless require yearly maintenance to combustion chamber and burner parts.
Prescribed maintenance should correct problems listed in error code 11.

Jun 25, 2011 | Rheem Tankless Hot Water Heater...

2 Answers

Our Richmond Tankless is showing a reading of a C2 error code. How do we fix this. Why is it doing this?


Before calling service technician, open following link for Richmond/Rheem troubleshoot resources including Rheem chat.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Error codes are considered start place for troubleshooting.
C2 11 is 'No ignition' or 'Gas is inadequate' or 'Ignition failure'
Error C implies ignition rod
http://waterheatertimer.org/pdf/ErrorcodeTroubleshooting.pdf

Jun 18, 2011 | Rheem Tankless Hot Water Heater...

1 Answer

No hot water. Constant beeping at the tank. Tempature gauge flashing 11.


Before calling service technician, open following links for Rheem troubleshoot resources including Rheem chat and typical service manual and typical product manual.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Error codes are start place for troubleshooting:
Error 11 is 'gas is inadequate' or 'ignition failure'
Open gas valve so handle is parallel with gas line.
Bleed air from gas lines.
Check that appliance is grounded.
Check igniter wires and harness for damage.
Check that vertical vent length does not exceed limit.
Other causes: Gas inlet solenoid valve, bad igniter, solenoid valve, flame rod.

Jun 14, 2011 | Rheem Tankless Hot Water Heater...

4 Answers

C2 11 code


Before calling service technician, open following link for Rheem error codes and troubleshooting resources:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Error code C2 11 is 'no ignition'
Ensure you have gas to the appliance.
Ensure gas type and pressure are correct.
Bleed all air from gas lines.
Ensure gas line, meter, and regulator are sized properly.
Ensure appliance is properly grounded.
Check gas solenoid valves for open or short circuits.
Ensure igniter is operational.
Check igniter wiring harness for damage.

There is no service bulletin covering how to perform these actions.
Rheem will ask that you call qualified service technician, who can give you tips and tricks for keeping the unit working, including opportunity for yearly service that will eliminate the expected $1-8 monthly savings from owning tankless.
Read manual for yearly maintenance needed to keep unit working at prime efficiency.

Apr 18, 2011 | Rheem Tankless Hot Water Heater...

1 Answer

Rheem take less hot water shuts down while in shower. Error code 11. Tried using more gas turned on gas dryer. This worked for 2 minutes, then error code 11. So I got a 2 minute army shower.


this is usally a ignition problem...it is usally the flame sensor or ignitor giving problem..if the unit is still under warranty contact rheem...or have a qualified technician check it out..

Aug 11, 2010 | Rheem Tankless Hot Water Heater...

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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