Question about Rheem Tank Water Heater G100-200, 100 Gallon

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G100-200 turns off

About once or twice a day, my G100-200 stops making hot water and "turns off". The system sentintel has the top green and next two red lights stay on, but the other lights are all off. If I unplug and re-plug the unit, the system "reboots" and turns back on and heats the water. Where to star with a diagnosis?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

gary1121
  • 332 Answers

SOURCE: Unit stops heating and must be unplugged to 'reset' once a week.

do you have alot of suit in the flue??? take the flue off and clean it then clean the burner assembly and see if this doesn't help you

Posted on Jun 21, 2009

gary1121
  • 332 Answers

SOURCE: 1 unit intermittently shuts off and other won't ignite

if you have the exhaust run together it will not light up,, they have to be seperate,, the computer board sences the unburnt gasses and will not allow it to start,,

Posted on Jul 08, 2009

  • 244 Answers

SOURCE: model PTG-42PVN

According to the symtoms...sounds like you have a problem with the flow control valve. If less than 3 yrs old, contact Rheem Customer Support at (800-432-8373) and they can an authorized tech in your area to service the unit.

If the unit is out of warranty, I reccommend you still call customer support to find a local technician. Unless you're highly technical/mechanical, this is not a problem you should attempt yourself.

Thanks for trying Fixya.com

Mike...

Posted on Feb 07, 2010

  • 349 Answers

SOURCE: 81sv-300 Breaker was turned off then

The button could be stuck on the thermostat or needs replacing. You try to reset it by putting the screw driver head against the reset button and bump the handle with your hand to try to free it up. I have tried that and it free up one, reguardless if it didn't you would have to replace it any way if it is bad.
The button should pree in to reset, also check element's out they can short and throw your breaker.

Posted on Aug 01, 2010

SOURCE: our rheem pronto tankless rutg-74xp

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

List of causes MIGHT include one of following:
Bad household circuit breaker that powers electronics, or loose wire inside outlet where tankless plugs in.
Tankless fuses and control board.
Water flow rate too low. Minimum .8 gallon required (depending on model)
Tankless inlet filter clogged.
Household aerators clogged at faucets.
Crossover at single-handled faucet
If installed, there can be crossover at mixing valve.
Faulty household check valve, including check valve on re-circulation system if that system is installed.
Restriction in household water line, such as clog at elbow.
Unequal pressure in household hot and cold lines, caused by restriction in hot line. When single-handled faucet turns on, the cold water pressure is higher so hot does not flow and tankless will not turn on.
Loose wire connection inside tankless.
Unit temperature set too high.
Unit temperature set too low.
Water temperature is very hot coming out of tap, so more cold is added, but that reduces amount of hot water flow, so tankless turns off because flow rate is too low.
On some tankless, if water is preheated by solar or other indirect source, the burner will not activate.
High mineral content in water > delime tankless yearly
Misaligned temperature sensor
Low gas pressure. Wrong type of gas. Undersized gas line.
Too many faucets on at same time.
Faulty tankless water valve. Water valve stuck.
Fluctuating household water pressure, for example MUD and PUD district water pressure problems or water well pressure.
Faulty household pressure reducing/regulating valve if installed.
Faulty household pressure tank, if installed -or- pressure tank needs to be installed.

Posted on Apr 24, 2011

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