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Martin invented gas stove mdl. AU40D/U40G/U40F

Martin invented gas stove mdl. AU40D/U40G/U40F pilot lights but will not stay lit already replaced thermocouple how do I check the low oxygen cutoff

Posted by Anonymous on

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6ya6ya
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Posted on Jan 02, 2017

Buffalo12980
  • 625 Answers

SOURCE: Pilot light lit but no heat

the pilot's millivolt generator may be at fault.  if you have a meter that is capable of measuring a very small DC voltage, connect it up to the very end of the thermocouple and the copper cappillary. the thermocouple has a welded bead at the very end inside that generates a small DC voltage. Same principle of a J-K thermocouple. Iron constintan  - two dissimiller metals where joined together produce a voltage when heated.  the thermocouple actuates a millivolt electromagnet inside the valve to keep the valve pellet open.  no voltage there it won't actuate the electromagnet.

Posted on Oct 15, 2007

  • 2458 Answers

SOURCE: Pilot light does not reach thermocouple

the pilot oriface is blocked it needs cleaning out ,

Posted on Jan 14, 2009

  • 1214 Answers

SOURCE: pilot wont stay lit installed new gas valve and new thermocouple

Is this a standing pilot furnace, or electronic igniton?

If standing pilot, does the heater use a fan to blow air through the heat exchanger?

If the answer to those questions is yes, then check that the pilot orifice is not partially plugged and that there is a strong pilot blowing against the thermocouple. If there is, replace the thermocouple. If not, check the orifice again, and check that the inlet screen to the gas valve is not filled with gas line trash.

If the the pilot flame is good and it continues to go out, the thermocouple magnet in the gas valve may be weak. Replace the gas valve as to get just the magnet and coil is not easy.

Reply back any questions you may have.

Posted on Jan 28, 2009

  • 2458 Answers

SOURCE: Dyna-glo parts

thermocouples you can buy from any heating spares oulet or national energy a hone well is most common for useing as a replacement

Posted on Feb 07, 2009

  • 2458 Answers

SOURCE: cozy gravity one sided wall heater...pilot won't

how by extending the duct work will it make the gas valve work ?

if the pilotkeeps going out clean pilot jet , or if the power unit has gone in the gas valve then you would have to change the valve , don't get the flue bit ?

Posted on Feb 24, 2009

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Heater serial # 3687823 was working fine then just stopped. cant get it to light now


if the pilot lights when held but wont stay lit, the thermocouple is shot, local hardware stores sell universal thermocouples. self explanatory to replace. if even when pressing the button the pilot doesn't light there is a blockage in the gas line or control valve. that needs a pro to fix.

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If the pilot lite comes on, but will not stay on after it has had enough time to heat the thermocouple, you got a bad or the wrong thermocouple. It does take some time to heat that thermocouple.

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Pilot lights will not stay lit on stove top or oven. Can light burners with match. Crosley c3100paw


You need to clean thermocoupling off it what the pilot lit uses to stay lit. you canuse sand paper or brush May need to replace, clean gas tubes on pilot also could be that

Dec 12, 2011 | Crosley Kitchen Ranges

1 Answer

I replaced the gasvalve and thermalpile in my 35,BTU wall heater I light the pilot and turn the heat on it goes out I ran a new state wire in case of a short but it still does it, did I get a bad...


Did you get the right gas valve for a thermapile and not a 24 volt gas valve? Also I would recheck my wiring.... Here is a article that may be of HELP....... Hope this Helps.....
Thermocouple: A thermocouple is a device made of two different metals which creates a small electrical charge when heated at one end.
Thermopile: A thermopile is a probe that contains multiple thermocouples, therefore it can produce a larger electrical current. Millivolts: 1/1000 of a volt - thermocouples and thermopiles typically produce from 25 to 600 millivolts of power.
Piezio - a spark producing device often used to ignite gas pilots and burners.
Gas Valves Types:
A. Single Thermocouple Only - Used on some gas logs
B. Valves with Thermocouples and Thermopiles - Used on most hearth appliances and gas logs with switches or remote controls or thermostats.
C. ODS Systems - Used on Mostly Vent-Free. Available in manual control or thermostat/remote/switch (combination) valves.
valvepict.jpg
Typical Gas Valve A. Thermocouple-Only
Found in: Most gas log sets with standard safety pilot knob control. Also found in certain gas space heaters and construction-site portable heaters.
Explanation: This type of gas valve used a single thermocouple. A thermocouple is a device made of two different metals which creates a small electrical charge when heated at one end by the gas pilot. This small charge causes an electromagnet inside the gas valve to open and allow gas to flow to the main burners. Since the thermocouple must be heated before the burner will start, gas appliances often have a startup mode, during which a knob must be depressed and held for 30 seconds or so after lighting the pilot. At the end of the 30 seconds, the pilot should be generating enough electricity for the valve to operate correctly. At this time, the startup knob can be released and the valve turned to an "on" position for appliance operation.
pilotclose.gif Troubleshooting:
Most problems with this type of valve are due to thermocouple problems. Check the following:
1. Connection from the thermocouple to the valve. Clean the threads of the connecting nut with a pencil eraser and re-tighten.
2. Pilot hood and flame direction. The pilot should engulf the top 5/8" of the thermocouple with a decent flame. If the flame hits the thermocouple too low, this can cause the appliance to go out or not generate enough millivolts for valve operation. The pilot hood and orifice should also be clean from soot which could slow or block the pilot flame.
3. Pilot pressure. Many of these valves have an adjustment screw to adjust the pilot flame. A pilot that is too short may allow the pilot to stay lit after ignition, but may not create enough charge to allow the burners to ignite.
4. Overheating: If the unit works for a few hours and then shuts down, it's possible the thermocouple has become overheated. Repositioning of the gas valve and/or pilot may be needed to avoid this problem.
Problems with LP units can also be due to a tank that is nearly empty or a bad regulator at the tank.
B. Thermocouple & Thermopile valve
gas1.gif Found in: Most modern VENTED gas stoves, fireplaces and fireplace inserts as well as vented gas log sets with thermostat or remote control.
This valve is similar to the thermocouple only valve, however has a pilot which heats up BOTH a thermocouple and a thermopile. The thermocouple still acts to prove that the pilot flame is on and allows this flame to continue after startup. The thermopile is used to power a second circuit which is used to open the main valve. This second circuit is powerful enough (300-600 millivolts) to allow the use of a thermostat, wall switch or control switch to operate the main valve. Control of the valve is obtained simply by hooking a pair of wires to two terminals located on the valve.
Startup is similar to the thermocouple-only valve. A piezo spark ignition is used to ignite the pilot after the gas knob is turned to the "pilot" position and depressed. Once the pilot is lit, the knob is held in for 30 seconds to "prove" the heat and then released and turned from the "pilot" to the "on" position. The main burner will then respond to the switch, thermostat or remote control.
Troubleshooting
Since there is both a thermocouple and thermopile in this valve type, it is important to isolate where the potential problem may be. If the pilot can be lit and stays on after the knob is released, then the problem is probably with the thermopile side of the valve. Here are the most common problems and solutions.
1. Pilot does not light or stay lit after knob is released - Make certain that the Piezo igniter works by checking for a spark between the igniter tip and the pilot hood. If there is no spark, the piezo may be bad or the piezo wire might be shorting to the appliance chassis. It is also possible that the igniter tip needs to be bent slightly toward the pilot hood so the spark jumps to it.
Check carefully that gas to appliance is on and that the valve is in he correct (pilot) position and fully depressed when lighting.
If pilot ignites but does not stay lit after knob is released, then the problem is with the thermocouple not generating enough voltage to the valve. It may be that the pilot adjustment needs to be turned up, or the thermocouple replaced. Another possibility is that the thermocouple may not be being "bathed" fully by the pilot flame. Check your owners manual for a diagram and description of the proper pilot flame and hood adjustment. It is also possible that there is soot or other blockage in the pilot tube, orifice or hood which is reducing the size of the pilot (and also the voltage of the thermocouple).
2. Pilot stays lit, but appliance will not turn on - There are two common causes for this. It is possible that the thermopile is not producing enough millivolts to power the control circuit. The millivolts can be checked with a simple voltmeter (consult the owners manual for proper setting) and adjusted with the pilot adjustment screw. Improper millivolts will also cause the appliance to shut down in the middle of operation.
Another common problem is loose or poor connections or circuits to your appliance switch, thermostat or remote transceiver. This can be isolated by simply using a small piece of wire to jump the "TP" and "TH" terminals located on these valves. If the appliance turns on when these terminals are jumped, then you can be sure that your problem is not in the appliance itself, but further down the switch circuit. Make certain you have used the suggested gauge of wire and that the length for your control runs does not exceed the specs given in your manual.
3. Other possible problems - include wind or back drafts affecting the pilot flame and checking of "spillage" circuits which may be wired into the valve in most B-Vent units.
If all the above checks out, and your valve is still acting weird (i.e., works some of the time), then you may have a defective gas valve in the appliance. Problems with LP units can also be due to a tank that is nearly empty or a bad regulator at the tank.
C. ODS System
Found in: Unvented (Ventless, Vent free) gas logs, fireplaces and stoves. These systems are available in manual or remote control.
ods.gif ODS stands for "Oxygen Depletion Sensor" , a term which accurately describes this valve type. The valve itself is similar in many ways to the two valve types above...with one exception. The pilot tube is a precision mechanism that creates a very stable flame as long as the room air contains the proper amount of oxygen. If the oxygen level in the room air drops even slightly, the pilot becomes unstable and lifts off of the thermocouple (see diagram) causing the gas valve and appliance to cease operation. This type of valve is very reliable, and there have been very few failures of this system - even with tens of millions in use worldwide.

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2 Answers

My Pyromaster Gas Fireplace Pilot will not stay lit


Try cleaning the thermocouple with sandpaper or wirebrush. Sometimes it gets dirty and doesn't sense the flame.

Dec 11, 2010 | Stoves Heating & Cooling

1 Answer

I have a Martin ventless gas log fireplace. I


Sometimes when you turn a gas heater off for some time, if the source tank has been turned off, the line will bleed the propane and the line will contain mostly air. This is especially true if the supply line is long. In order to light the pilot, you will have to hold the pilot lighting button down for a while (a full minute or longer, depending on the size and length of the supply line) before pure propane arrives at the pilot light jet. You should keep a lighted lighter at the jet so that when the gas arrives, the lighter will light it. After the pilot lights, you will have to keep the button pressed long enough for the thermocouple to get hot enough to set the pilot to stay on. When it is hot enough, you should be able to release the pressed lighting button and the pilot should stay on. If it does, you should be able to light the heater. If the pilot jet never lights, gas is not getting to the regulator. If the pilot will not stay lit after a period of time waiting for it to heat the thermocouple, the thermocouple or the regulator may be bad and need replacement. :-)

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1 Answer

Pilot light won't stay lit when you try to turn control knob to thermastat. Is it the thermocoupler, the control valve or the pilot assembly?


Once your pilot is lit the thermocouple sends millivolts to the gas valve to tell it that the pilot is lit and to allow the gas valve to open. Check to see if your thermocouple is in the pilot flame. I f it is then you will need to replace the thermocouple.

John

Oct 03, 2009 | Heating & Cooling

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.

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2 Answers

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is it full of dust my hot water used to do the same till i blew the dust and fluff out

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