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I have pro com gas logs cant get pilot light to stay on and heater to com on

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Not sure if this poarticular unit has it but try to clean the thermocouple off with either a wire brush or emery cloth. then attempt the re-lighting of the pilot.

Posted on Jan 11, 2009

  • Todd Born
    Todd Born Jan 11, 2009

    be sure to hold it in for 30 seconds afer you re-light the pilot.

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Pilot light keeps going out when we turn heater down, not sure why and what numbers selection means, please help


You didn't mention what type of heater it is. If it is a gas heater then the problem is most likely the thermocouple. This is because there must be a standing flame that keeps the end of thermocouple hot which in turn lets the gas valve stay on and that lets the gas to the burners.

Good luck,

Marty

May 06, 2014 | Air Conditioners

1 Answer

My fathers Bosch water wizard tf 250 will not start. the water will flow but no gas will not ignite or come through the pipe to the heater. the gas bottle is full. thanks Dave Tooley


Dave, make sure that the gas valve on the Propane tank, is fully open and that the inline gas shutoff valve near the heater is turned ON. Those are the basic two things that would prevent the gas from flowing thru the gas line, to the heater.

If the above valves are ON, the problem then lies with the gas control valve on the water heater. If it has pilot light that has to be lit, make sure that the heater's gas control valve is properly in the PILOT Position, before attempting to light it. It must be able to be pushed ALL the way in and you should feel strong pressure pushing back at you (other than spring pressure). When you feel that, it's in the PILOT Position and ready to be lit. Once it's lit, continue to hold the Pilot Button in for 1 minute, then release it. If the Pilot stays lit, turn it to the ON Position.

Hope this helped you to troubleshoot and solve the problem. Please let me know. Thanks.

Jun 22, 2011 | Air Conditioners

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.

Mar 02, 2011 | Air Conditioners

1 Answer

The pilot light will not stay on for more than 5min. If I light the fire when its on,it just goes out. The fire is a Fusion 2/7


I assume this is a gas log? If so, you have dust in your pilot assembly. Turn everything off and let it cool. Note the opening where the pilot flames burns. Use the wand from your vacuum cleaner and place it over the opening for the pilot flame. Gently tap the side of the pilot assembly while holdign the vacuum above the opening. This will lift the minute dust particles out and allow the flame to burn nice and blue again. These logs have Oxygen Depletion Valves on them. The pilots are very sensitive to dust.

Jan 18, 2011 | Air Conditioners

1 Answer

We have a Rinnai 2000D heater. The pilot light goes out and is then difficult or impossible to restart. The igniter is working and there is the smell of gas, just doesnt seem to be enough gas there to...


you can try cleaning the pilot light with sand paper, (where the hole in the end is where the gas comes out) they get carbon built up over time and causes the hole to get smaller which makes the pilot light not want to stay light because of the small amount of gas coming out.

Sep 25, 2010 | Rinnai Air Conditioners

1 Answer

Pilot on logs won't stay lit


Hold pilot button longer. if this doesn't work your Thermopile has gone bad and will not generate enough Millivolts to keep gas valve pilot open. A new thermopile will generate 750 millivolts. It cost less than $20 dollars but is difficult to replace. You should call a certified technician. They will charge you about $100.00

Oct 19, 2009 | Desa International Wall/Window Air...

1 Answer

The heater in my central heating is not getting turn on but the fresh air and cooling is getting turn on


Check the pilot light.Older standing pilot systems use thermocouples to verify the pilot is burning before the gas valve opens.If the pilot wont stay lit replace the thermocouple.
Newer systems light the pilot.On a call for heat the igniter lights the pilot. When the heat is verified the gas valve opens . Some systems use an circuit board with flashing led lights to help troubleshooting.

Jan 11, 2009 | Air Conditioners

1 Answer

Pilotlight on gas water heater went out. cant get cover off to light pilot light. Heater is three years old.


Some of the modern heaters have covers that are not removed to light the pilot. Look for an external "clicker" type spark ignitor.

Usiually a red button. Sometimes integrated into the gas valves on/off switch.

Dec 06, 2008 | Air Conditioners

1 Answer

I have an old gas heater when i go to light it the piolet light wont stay on when i turn the knob to make it hotter.


Old heaters that have a "standing" pilot light that burns all of the time use a device called a thermocouple. The thermocouple sits in the flame of the pilot and when heated by the pilot, produces a very small amount of electricity (approx 30 mV) which the heater interperets as proof that the pilot is burning and indicating that it is okay to turn the main burner on. The thermocouple is a part that wears out and when it fails causes the exact problem that you are describing.

Jun 26, 2008 | DeLonghi Air Conditioners

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