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Heater was working fine it has stopped and now is not lighting it seem that the gas pressure is to low for the pilot to heat the thermocouple i have adjusted the regulator and it made no differents presser to the unit is fine

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The pilot orofic is probaly clog and needs to be cleaned

Posted on Sep 03, 2010

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Not light


check to make sure that the poilet lite flame is touching the tip or top of the thermocouple.
the pilot lite needs to heat up the thermocouple so that the thermocouple opens the gas to the main gas log. a cold thermocouple shuts off the gas to the main gas log or gas burner and a hot thermocouple opens the gas to the main burner.
the pilot lite flame must be touching the thermocouple to heat it up.
pilot lite orface needs to be clear to let the pilot flame gas through with enough pressure so that the little flame can reach & touch the thermocouple. Pilot lite gas feed tube must be clear to let gas through. Use compressed air or a fine sewing needle, or even carb cleaner to clear out orface hole and gas feed line to pilot lite.

important!! WARNING:
if you use carb cleaner,make sure all the carb cleaner is dry,soaked up with paper towell or kleanex tissue and blowed out with compressed air , because carb cleaner can burn just like gasoline; so any carb cleaner must be compleatly gone before you attempt to lite the pilot lite.

May 20, 2013 | Lite On Laars Lite 2 Heaters: 250,000BTU...

1 Answer

Pilot light will not stay light


1) Open following link for how-to resources, illustrations, and service manuals for some brands of heater.
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot

2) Many things can cause pilot problems, including bad thermocouple, air in gas line, low gas pressure, negative pressure in house, bad venting, very hot attic, lack of combustion air, dirty combustion parts and dirty pilot tube, bad gas control, reversed polarity on electrical outlet.

3) If pilot flame is clear blue and strong, then next step is check that thermocouple sits in the flame, and then change thermocouple. This is start point. Following step would be reading service manual for exact troubleshoot and testing steps.

4) If pilot flame is yellow-or-orange or weak, then clean dirty combustion parts including pilot tube and air intake. Might want to change thermocouple while combustion parts are removed for cleaning.

5) Take a moment and rate answer:
And 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.

Sep 05, 2011 | RTO W4 A.O Smith Gas Hot Water Heater...

1 Answer

Pilot goes out after heat cycle, relight and it stays burning untill next heat cyle has run.


This sounds like a dirty pilot jet orifice or a weak thermocouple. The pilot orifice can carbon up (natural gas is a fossil fuel), become weak and keep going out whenever the main burner lights, which causes a pressure drop in the gas line. The thermocouple can also become dirty and not sense properly.

The pilot light assembly should be cleaned. The gas must be turned off and it's best if the pilot assembly can be removed. Automotive carb cleaner can be used to clean the orifice. Do not try to insert any object into the pilot orifice valve as this can result in damage.

If cleaning does not resolve the problem, replace the thermocouple first. Make sure it is installed correctly and is squarely in the pilot flame.

Dec 10, 2009 | Rheem 40 Gallon FVR NATGAS Low WATER...

2 Answers

My pilot light will light, but will not stay lit? I have a gas whirpool water heater aprox 1 1/2 years old.Thisis the first time we have encountered any problems with our appliance.


Once the flame has struck it heats up a thermocouple that in turn holds the gas valve open

It is a safety measure in case the flame blows out and the gas keeps on coming.

Sometimes the end of the thermocouple gets dirty and a scrub with a fine emery board does the trick

If not it is a new part (They are not that expensive)

Jul 07, 2009 | Whirlpool Water Heaters

2 Answers

PILOT LIGHT WILL NOT LIGHT


the thermocouple not only keeps the pilot on but lets the gas valve know its okay to open on a call for heat, remove your thermocouple and clean it with a fine grit sandpaper and if this doesn't work replace it all together.

Jun 02, 2009 | Lite On Laars Lite 2 Heaters: 250,000BTU...

1 Answer

Propane patio heater ignition problem


I would change the thermocouple and here is why:

The thermocouple is the pilot's, well, co-pilot! It is the electronic device that senses if the pilot flame is hot enough to sustain burning the gas fuel from the burner. If the thermocouple thinks it's safe, then it keeps open the main gas valve located in the pilot assembly. If the thermocouple does not sense enough heat from the pilot flame (such as when the pilot is out), then the thermocouple shuts off the gas valve to the burners.
How the Thermocouple Works
So what is this thing and how does it work? Well the thermocouple (technically called a thermocouple junction) is a device that contains two metal wires welded at the ends and placed inside a protective metal case. The thermocouple sensor is found at the business end of the pilot flame and is designed to be placed in the hottest part of the flame. The other end is connected to the pilot valve body. As the thermocouple heats up, it produces a small amount of electricity and when it gets hot enough from the pilot, send a signal to open the gas valve by using a solenoid operated by a 24 volt transformer. The thermocouple calls the shots, and by converting heat to an electrical signal, it allows the gas valve to open or close. Once the gas valve is open, gas is then constantly supplied to the pilot and as required for the gas burners (as called for by the thermostat). If the pilot goes out, then the thermocouple gets cold and produces no electric signal to open the gas valve's solenoid and the gas valve shuts off the gas supply to the pilot and burners

May 27, 2009 | Endless Summer Blue Rhino 235000...

1 Answer

Wall mount propane heater ignites, but won't stay lit


I have a Reddyheat IWH16NLTD with this problem. When the heater fan turns on it blows the pilot light slightly up and away from the thermocouple causing the safety valve to close after the ceramic cools down. The manual says that low gas line pressure can cause the flame to rise too far from the thermocouple causing this problem, so either it is a problem with gas pressure, or it is an assembly plant problem.

Jan 10, 2009 | Reddy Heater-10-12-15,000 Btu L.P.

2 Answers

Gas oven dosnt work


the pilot light is there for 2 purposes. number 1 to light the burner and number 2 to heat up the thermocouple, thermocouple is a wire that the flame from pilot suppose to surround by fire. if the pilot is to low it will not reach the thermocouple. you can take the gas line that supplies gas to the pilot and clean it with a safety pin or a small needle. you can test the thermocouple by heating it up with a blow torch on low heat, get it red hot and then turned on the oven. if the oven works clean the pilot, if the oven do not work, replace the thermocouple if separate from safety valve. if thermocouple is part of it replace the safety valve.

Dec 14, 2008 | GE Profile Spectra JGBP90 Gas Kitchen...

1 Answer

Insufficient gas pressure at the pilot to heat thermocouple


all jets and lines need to be cleaned out
compressed air is safer

Apr 11, 2017 | Procom QL300TYLA Heater

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