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Hi helpers, I'm an apprentice plumber and have a lot to do with rheem stellars, i replaced a thermocouple today on one and unit lit fine and pilot stayed on, however the customer rang and complained and said I hadn't fixed it, I have sine gone back and discoved black soot all through the hot water service and out the flue. This is now the second unit that this situation has occurred on and am wondering what's happening and how I can solve it. Any help would be greatly appreciated

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Your not getting enough air mixing with the gas and that's what causes the black soot. Typically this occurs when you're using a natural gas system on propane or butane. If this is the case you need to convert it to the proper propane orifices (jets) and open the air intake. If the unit has not been converted the problem still remains the same, you're not getting enough air mixing with the gas. You have an obstruction, which can be very small, inside the air intake or mixing tube or the orifice has been opened up to large and is allowing too much gas into the system and the maximum air opening isn't enough to compensate for the extra gas. Cobwebs are a common occurance inside a mixing tube, check for that after you've verified the orifice is the correct one for the type of gas that's being used.

Posted on Oct 04, 2010

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Pilot light wont stay lit once button is released unit is about 11 years old


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If pilot lights and flame is robust and clear blue, and pilot goes out later, then some suspects can be excluded: air in gas line, low gas pressure, thermocouple is overtightened (finger-tight + 1/4 turn), thermocouple not positioned correctly in the flame, dirty pilot tube.
If flame is yellowish and small: then clean pilot tube and combustion parts.
http://waterheatertimer.org/How-to-install-gas-water-heater.html#clean
Remaining suspects can include: air in gas line, low gas pressure, bad gas control valve, tight house so household vent fans pull air down water heater vent that blows out pilot, hot attic with inadequate ventilation, water dripping down vent.

Open following links to read troubleshoot resources.
http://waterheatertimer.org/pdf/Pilot-light-will-not-stay-lit.pdf
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The pilot will not stay lit after water in tank reaches desired temperature. After tank cools down pilot will relight and heat water again thyen goes out approximately 1-2 minute3s after water has been...


Hi,
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I have a Rheem PG50T9A gas hot water heater. We had hot water this morning. When I came home the pilot light was out and won't stay lit. Any ideas?


Hopefully just the thermocouple. The thermocouple is the small rod right next to the pilot light. The flame on the pilot heats up the thermocouple and keeps the gas valve on. You can replace it yourself. The thermocouple will be connect by a small nut on the underneath side of the valve, and you will have to pull the thermocouple out of the pilot assembly. Not an expensive part, you can get it at any hardware store. Hope this helps you .

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I have a Reliance water heater - 40 gal Model


In my first 15 years as a plumber I never saw a pilot light issue on a gas WH that a new thermocouple didn't fix. Since the government mandated a redesign of the fire box, I've seen three that nothing ever fixed - two Whirlpools and one (my usually ultrareliable) AO Smith - including replacing the entire burner assembly and the regulator. And I've heard of many others.

Check the thermocouple connection for tight. (Don't strip.. threaded soft metals.)
Check the microvents on the bottom ? of the burn box for dust, even if it is new.
Call Reliant and demand new units until you get one that works.
Try another model. Consider a 52gal electric.

I've always recommended gas over electric, and AO Smith and Rheem were my recommendations (and "Reliants" were "lumber yard" water heaters. Sorry.)

Since the mandated redesigns, I don't really have a "proven reliable" model to suggest. I increasingly believe the restricted air flow design is the ultimate culprit, including any changes to the thermocouple/regulator construct to accommodate the restricted air flow design. Just my hunch.

Offered for what its worth. -- plumber in Indiana.

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My pilot light won't stay on. The unit was working fine today but it just stop, any suggestions?


Your thermocouple has probably gone bad, this happens often and it is not an expensive part to replace

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try cleaning the top of the pilot light jet if you can get to with small brush then blow it clean with a compressor.

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Thermocouple is probably not adjusted in to the pilot flame correctly, readjust and try again, if that does not work replace the thermocouple, not all brand new thermocouples are good right out of the bag

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