Question about Rheem Tank Water Heater G75-125, 75 Gallon

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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 at both pilot and main valve teminals at gasvalve. I have 10 inches of gas pressure. It ignites and burns for 5-10 seconds then I lose voltage to the gas valve. What am I missing? Also, where does this water heater sense presence of pilot flame - through the spark ingniter cable? Thank you, Dave.

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1 Answer

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.

Posted on Apr 11, 2011

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Posted on Jan 02, 2017

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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.
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http://waterheatertimer.org/images/Test-water-heater-vent-400.jpg

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http://waterheatertimer.org/pdf/Reliance-2006-Service-Handbook.pdf

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