Question about Rheem GN100-200 100-GALLON 199900 BTU Lo Nox Water Heater

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Rheem gn 100-200 commercial water heater. The unit does not shut down when the inducer motor is disconnected.

The pressure switch is working. The icm is new. it will fire up without the induces motor.

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Posted on Jan 02, 2017

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SOURCE: rheem power vent water heater shut down due to toxic vapour

Are you getting an error code? I could just be the pressure switch on the unit not allowing it to come on. You can try removing the hose from the inducer and blowing into and drawing air in and out of the tube. You will hear a clicking noise when you do this. Reattach the hose and try the system. Also, you have to unplug the unit for at least 10 minutes and then plug it back in to reset the controls. If the "Guardian" system still senses the fumes, it will not allow the unit to kick on. I could be awhile for the fumes to disapate before it will work. Try putting a low volume fan on the base of the unit to try and keep fresh air moving around the "Guardian" sensor.

Posted on Apr 05, 2009

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gary1121
  • 332 Answers

SOURCE: rheem tankless water heater wont lite

the system was not sized properly, you need to have a 3/4 gas line to the unit for the volume of gas it needs, the tankless water heaters need to have every bit of gas that is says, it sounds like who ever installed di not make sure you had enough gas comming in the house, you might have to either have a new meter installed or run the gas lind directly from the meter to the water heater and cap off the gas line thats there

Posted on May 29, 2009

snap101
  • 117 Answers

SOURCE: Heater shuts down with C4-13 code

your not getting enough fresh air to it. where is it located? you need 1 square inch per 1000 btu's. it's having irregular combusion.

Posted on Aug 02, 2009

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SOURCE: Rheem power vent 2 water heater keeps shutting off

you need to replace the upper thermostat, it has the overtemp switch made to it. Also make sure that the thermostat is pushed up tight to the tank with no space or object between them.

Posted on Mar 13, 2010

  • 9 Answers

SOURCE: rheem power vent motor doesn't shut off

There could be blockage in your water heaters venting on the outside of the home. It sound like the high limit switch has been tripped. Try unplugging the tank and plugging it back in. this will reset the tank. if the problem persists you will want to call your provider for service.

Posted on Jul 29, 2010

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Pressure switch failed to open


1) Copy following links:
Troubleshoot by type of gas control valve.
Also Scroll up and look on right side for Pressure switch troubleshoot resources.
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent

2) Post question on pro water heater forum:
http://www.thetankatwaterheaterrescue.com/forums/forum3/

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Can u tell where the reset switch is located i this model or the g91-200


The reset is the ECO.
I can get you started but have not worked on this water heater.

Open following generic manual for Rheem commercial gas water heater:
http://waterheatertimer.org/pdf/Rheem-Commercial-Gas-ECO.pdf
http://waterheatertimer.org/pdf/Rheem-Commercial-Gas-Universal.pdf

Troubleshoot tree on page 20 shows series of tests and actions to restore ECO or determine if gas control valve is bad.
Maintenance steps start page 11. Gas water heaters today should receive yearly maintenance.

Add a comment and say how the problem was repaired.

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.

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Rheem G75-125 natural gas. Water heater ignites and burns as it should for 5-10 seconds and then shuts off. The damper is open. All of the lights on the front cover light in proper sequence. I get 24 volts...


Suggested order of things.

1) Read manual troubleshoot and maintenance sections
Find same-similar manual at Rheem
http://www.rheem.com/products/commercial/water_heating/commercial_gas/
http://www.rheem.com/product.aspx?id=0697944D-D79A-40C1-BDEB-875E48200DD1
http://globalimageserver.com/fetchDocument.aspx?id=c0b73553-5f03-4a5e-8789-4732ffecdccf
Maintenance and troubleshoot sections might help solve problem.
Download manual to your computer as a resource.

2) Post question on pro water heater forum, and include details from manual, and link to manual, so pros don't have to search Rheem commercial water heater page to find manual.
http://www.thetankatwaterheaterrescue.com/forums/forum3/

3) Contact Rheem who will ask you for name of installer and servicing technician.

4) Call service technician.

Add a comment with your experience so others with same-similar problem can benefit.

Also 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.

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I get error code 13 when I put too much demand on the hot water. Too much demand before it shuts down is the bath tub at 1/2 the possible volume. I have adjusted my water pressure at the pressure...


Use following link for Rheem tankless troubleshoot:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

I believe error code 13 is oxygen sensor malfunction.
Contact Rheem.
http://www.fixya.com/support/t3913798-error_code_13_air_flow_tankless_h20

Add a comment for more free help.
Also 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.

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Rheem power vent water heater shut down due to toxic vapour


Are you getting an error code? I could just be the pressure switch on the unit not allowing it to come on. You can try removing the hose from the inducer and blowing into and drawing air in and out of the tube. You will hear a clicking noise when you do this. Reattach the hose and try the system. Also, you have to unplug the unit for at least 10 minutes and then plug it back in to reset the controls. If the "Guardian" system still senses the fumes, it will not allow the unit to kick on. I could be awhile for the fumes to disapate before it will work. Try putting a low volume fan on the base of the unit to try and keep fresh air moving around the "Guardian" sensor.

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