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Wather heater will not ignite

Valve SIT-610 AC3 gas to valve but none to orfice. Took off the gas line to the control and gas under pressure was present. Took line off to orfice and no flow from valve, with control pressed down for a long time.

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  • Stan Kline Aug 17, 2008

    That is my problem: When I hold down the knob in the pilot position the gas is supposed to flow so that the pilot may light. Cleaned the orfice first. No gas flows so the pilot does not light. I took off the gas line to the orfice and still no gas out of the unattached tube.with the knob pressed down in the pilot position.
    I have to get the gas to flow with this knob pressed down in the pilot position. Still perplexed!


  • Stan Kline Aug 18, 2008

    Used a short stick to prop the pilot valve open. Waited [forever] and finally smelled some gas. Turned the valve off and waited quite some time to vent all the gas out of the heater. Did not want it to go boooom!
    Started the process all over again. Held the knob down in the pilot position and lit the pilot, then waited long enough for the pilot to stay on and moved the knob to on. Behold the thing works! Still do not know why the initial attempts to ignite the boiler die not work. Next day it worked again.
    I see the note above. Is there a retrofit piezoelectric started for this boiler?

    Thanks to everyone!!!!

    Stan


  • tex2539 Dec 25, 2008

    Unable to light pilot on a A. O. Hot Water Heater

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  • Master
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You'll probably need to ignite the pilot light before it will allow gas to flow for the heater to ignite and warm the water.. Most controls have a Pilot position that you switch it to , than using a long match .. locate the pilot light in the access opening at the bottom and get the pilot light to stay lit.. Hope that helps...

Posted on Aug 16, 2008

  • Rick Gelin
    Rick Gelin Aug 17, 2008

    If you have gas pressure to the control assembly ( which you said you do) and you select the "pilot" position.. and press the red button.. you should have gas flowing ( albeit only a small amount) to the pilot jet itself..If you do not, then you probably have a defective gas conrtoller.. Sounds like tha to me.. and it also sounds like you have a pretty good understnading of the contrl system .. Here is a short tutorial on how it is supposed to work...



    If you have an older model furnace or water heater that uses natural gas, or if you have a set of gas logs in your fire place, you have probably seen the small blue flame known as the pilot light. You may even have been able to experience the thrill of relighting the pilot light when it goes out. Let's take a look at how the pilot light works.

    The basic idea behind a pilot light is simple. Its purpose is to provide the flame needed to light the gas coming out of the main burner. When the furnace "turns on", a valve releases gas into the burner and the pilot light ignites that gas.
    The way that a pilot light is created is also simple. It is made by allowing a small amount of gas to come from the gas pipe through a small tube. You light the gas escaping from the tube, and it burns all the time.
    You can see, however, that the pilot light creates a potential safety problem. If the pilot light flame were to ever blow out, the gas would keep coming out of the pilot light tube. If this gas were to collect inside your house and then ignite, it would create an explosion. To solve this problem, the pilot light tube has a valve that cuts the gas to the pilot light in the event that it ever blows out.
    This valve is actually a fascinating little piece of equipment. It has to be able to sense whether that pilot light is lit or not, and for safety reasons it needs to be able to do that without requiring any outside electricity. How can you create a pilot light sensor that works reliably over the course of many years without any electricity?
    The answer to that question is ingenious. The way to do it is to use the heat of the pilot light flame to generate the electricity by using a thermocouple.
    Thermocouples generate electricity directly from heat. They take advantage of an electrical effect that occurs at junctions between different metals. For example, take two iron wires and one copper wire. Twist one end of the copper wire and one end of one of the iron wires together. Do the same with the other end of the copper wire and the other iron wire. If you heat one of the twisted junctions with a flame and attach the two free iron wires to a volt meter, you will be able to measure a voltage.
    In a pilot light, one of the junctions of a thermocouple is sitting in the pilot light's flame. The electricity that is created runs to a small electromagnetic valve and holds it open. If the pilot light blows out, the thermocouple quickly cools off. It stops generating electricity and the valve closes.
    To relight the pilot light, you have to push a button that opens the value manually. Then you light the pilot light and wait for the thermocouple to heat up (about 30 seconds). Once it is hot, the thermocouple is generating the electricity needed to hold the value open. Then you can let go of the button.
    The problem with pilot lights is that they waste a lot of gas. Therefore, most modern appliances do not have a pilot light. Instead, they use a piezoelectric spark to light the burner.

  • Rick Gelin
    Rick Gelin Aug 18, 2008

    You could probably retrofit a piezo electric ignitor in there ( similar to one used on a gas barbeque grill) however the likelyhood of having to continue reigniting that is normally pretty low. It should stay lit until an event happens .. water tank bursts and leaks water of something similar.. In all probability the spring loaded mechanism that opens the gas valve may have gotten stuck.. so now that it is operating normally.. it should probably be OK.. Glad you got it going..

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