Rheem RTG-74PVN-2 Natural Gas Pronto Whole House, Natural Gas, Tankless Wat Logo

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Posted on Aug 13, 2017

I HAVE A RHEEM/RAKA-030JAZ and when i turn the heat on it will run for about 20 minutes then turn off and it wont come back on for about at least a hour or two. I have moved the temperature hand upand down and just simply had it turned on ON and it still does the same thing. I have natural gas and it does heat when it comes on it just don't stay on for long. Do you know what's wrong with it?

5 Related Answers

Thomas F. Schneider

  • 2715 Answers
  • Posted on Jan 31, 2009

SOURCE: dripping from drain spout

If you are refering to the "Dripping coming from the preasure tempature valve,Then just turn off the valve where the water goes into the heater and open the P/T valve with a bucket below it draining only emought water to get below the level where it reaches.     Normally the drain valves are plastic with a Male hosebib attached.  Attach a  garden hose to the rain and run it out to a point lower that the vaslve in order for gravity to drain the tank.The valve opens counter clock wise. If the valve is stuck or does not drain,and you have a foor drain handy,remove the whole valve and replace it with a boiler drain valve.  If The tank is located below the drain level then you will have to either pump or carry the drain water to the higher level.     Replace the P/T valve  and reinstall the associated associated piping. I would use tefelon tape on the P/T pipe theads.    You may have to open a hot water faucet in order for the air to replace the water in the tank ,in order to drain. 

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Anonymous

  • 13 Answers
  • Posted on Oct 24, 2009

SOURCE: Rheem gas water heater it won't stay lit...will

For the main gas valve to come on several conditions need to be met.

The system must detect a pilot light prior to turning on the main gas valve for systems with a standing pilot light (not sure what your system has) and on systems with auto igniters (spark or ceramic heat glo) the control board must detect a flame present at the main burner a few seconds after the main gas valve turns on.

The other condition that must be met on systems with power exhaust systems is a vacuum/pressure diaghram switch must be made and stay made telling control circuits that vacuum/pressure is present = power exhaust fan is on and working.

From your description it sounds as if you may have a dirty/failing flame detector (thermocouple). Remove it and give it a good scrubbing with a scotch brite pad etc. cleaning off any carbon or corrosion/gunk re-install and try it out, or simply spend $15.00 or so and install a new one to be sure. The thermocouple is the metal thin tube that protrudes into the pilot and/or main burner flame and is connected to the main gas valve by a thin capilliary tube.

To check the vacuum swich on the blower a multi meter across the switch terminals looking for a steady "state change" as the blower runs/stops will work.

Paul Carew

  • 3808 Answers
  • Posted on Jan 24, 2010

SOURCE: We have an older Rheem Fury (gas) water heater and

Hi I would try changing the thermocouple

David Jewell

  • 454 Answers
  • Posted on Feb 23, 2010

SOURCE: I have a Rheem 50 gal. natural gas water heater

The most common reason a pilot light will not stay lit is a bad thermocouple. How old is the water heater? If the pilot light will light, but then go out when you release the safety button, that is a sure sign the thermocouple is bad. You can buy a replacement thermocouple at your local home improvement store. There is a small chance that the control valve has gone bad, but that is highly unlikely.

Lickzee

  • 68 Answers
  • Posted on Aug 12, 2010

SOURCE: Loud Vibration/Noise when System Starts

This happen when there is air in the gas line...if the problem is still there after a couple of days you will have to return the unit for an exchange the gas control is giving problem...contact rheem first before making a exchange decision..they will walk you some step first to ensure there is not a problem

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