Question about Bosch & Tankless LP Hot Water Heater

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Pilot goes out might stay on for a week or a minute

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Pilot fault not giving enough power to thermal couple or replace thermal couple

Posted on Apr 25, 2014

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We have an atwood lp gas water heater 6 gallon g6a7 white rogers control. The pilot lights but when we turn it to on it goes out, even after holding it up to a minute. It was running fine, we thought we...


If pilot stay lit, then thermocouple is working.
If pilot will light, then you have gas. If pilot goes out when pilot button is released, then thermocouple is next suspect.

Thermocouple tip must sit in pilot flame.
The pilot light heat applied to two different metals inside thermocouple causes small current.
The current travels back to gas control valve through copper line.
If the gas valve receive this current, then a magnetic switch stays open and allows gas into the gas control valve.
The magnetic switch is on the end of the red button you push down when lighting pilot. Essentially the red button is an override to the magnetic switch.
If the gas control valve does not receive the current, then the magnetic switch does not stay open when you release the red button.
When replacing thermocouple, note that it is not screwed very tight into the gas control valve. Finger tight + 1/4 turn. If it is overtightened, then the small thermocouple current shorts out against the gas control body.

Sep 01, 2012 | Water Heaters

1 Answer

I light the piuolot button and when i let go of the pilot button the pilot goes out does not light burner wont stay lit


When you light the pilot lite you have to hold the button down until it gets the element hot enough to stay lit. If you hold down the button and lite the pilot and let it go right away it will go out. What to do is hold down the button and lite the pilot and continue to hold the buttn down for about 45 seconds to a minute then let it up very slowly and you will see if it is going to go out by the flame getting smaller as you let up on the button. If it does start to get smaller conitnue to hold it again for a few seconds and repeat the process of letting it up slowly. when the control element gets to the right temperature it will stay lit then turn your valve to "ON" and the fire will start up and continue to heat the water.

Mar 15, 2011 | RELIANCE ELECTRIC WATER HEATER

1 Answer

Pilot will light, goes out when button let go,


A long time ago, in a place far away, I saw an old gas valve, might have been on a water heater, might have been off an A/C unit. I took my 10" adjustable wrench and unscrewed the coil that the thermocouple screws into. Now, when I have the problem that you describe I take the threaded end of the suspected thermocouple and put it into my spare. I light the pilot and hold the button down. Then, after a minute or two, I press the button on my spare, which now has the thermocouple attached. If the spare stays in the "ON" condition, I have just proven my gas valve to have faulted.

I suspect you main gas valve has failed, if you can find another valve, you can test as above, before buying a replacement valve.

Jul 20, 2010 | RTO W4 A.O Smith Gas Hot Water Heater...

1 Answer

Pilot will stay lit but burner goes out about 1 minute after it lights


Sound like the flame sensor you could scratch around on it and try again.Possibe venting issue

May 14, 2010 | Water Heaters

1 Answer

I cant get the pilot lit...I turn it to pilot...hold down the button and light the pilot..but when I let it go to turn it to "on" the flame goes out.


Are you holding the button down for a minute or so after you light the pilot before releasing the button?

If so, almost certainly, your thermocouple is bad. This is the long tube which runs from the control box to the pilot flame. Remove this tube, take it to the hardware store and get an exact replacement.

Once the thermocouple is replaced, your pilot light should stay on.

Apr 04, 2010 | Rheem 50 Gallon FVR NATGAS Water Heater...

1 Answer

Water heater will not lighr


Most likely the thermocouple which goes from the gas valve to just above the pilot light flame is bad. You can get these from any furnace supply or Lowes/ Home Depot normally. If you can depress the gas valve button and get the pilot light to light, and after holding the button in for about a minute you see it go out, then it is definitely the thermocouple.

Jan 23, 2010 | Rheem 40 Gallon FVR NATGAS Low WATER...

1 Answer

GE Smartwater Heater model# GG40T6A won't stay lit


Look and see if your pilots flame is touching the themocoupling ,if it isnt then cleane your pilot orfice.If that dosnt work replace thethermocoupler.I would also check the draw. Hold alit match or a cigerett up to the draft diverter (the air space between your heater and the vent. If it dosent draw the smoke up the vent it meanes your vent is stoped up or you need to raise it.

Dec 02, 2009 | General Electric GE SmartWater Household...

1 Answer

Pilot goes out


IF THIS IS A STANDING PILOT TYPE WATER HEATER MEANING THE PILOT STAYS LIT ALL THE TIME IT IS USUALLY CONTROLLED BY A THERMOCOUPLE WHICH IS USUALLY THE CULPRIT THIS IS USUALLY AVAILABLE AT ANY GOOD HARDWARE STORE GET THE SAME LENGTH AS YOU TAKE OUT EX 12-18-24 INCH

Nov 25, 2008 | Water Heaters

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