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Fireplace doesn't turn on

Pilot is on, but when i turn on the wall switch the fireplace doesn't come on. I replaced the thermopile and gas valve, still i have the same problem.

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Check the pilot injector might be blocked

Posted on Dec 08, 2008

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Lennox Gas Fireplace. How do you replace a thermopile on a Lennox Gas Fireplace, Model # MPD4035CNM?


First take a picture of the logs so they go back in the same position . re move logs to gain access to pilot block thermopile is the lager probe of the two it comes undone by undoing the hex nut below it and removing the two wires on the gas valve its easy but fiddly.

Nov 11, 2016 | Heating & Cooling

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Where is the thermocuple on my marco gas fireplace


Fireplace Pilot Light Tutorial - YouTube

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Dec 07, 2015 | Heating & Cooling

2 Answers

Need some troubleshooting tips on a fireplace. I've got the pilot on but when I flip the wall switch nothing happens.


Most of these unit are controlled with a millivolt signal that is generated from the thermopile.
We see this often at the beginning of the year.
Remove the wires from you wall switch and clean them so you have new metal showing and tighten them back to the wall switch.

With your gas valve in the on position try the switch.

If this doe not work do the same thing to the wires on the gas valve where they hook to the TP/TH connecting and the Th connection.
More information can be found at www.allpartsinc.com

Nov 05, 2014 | Leisure HOMEPRIDE Electric Fireplace...

1 Answer

My gas log will light on pilot but will not light fully.


Typically, if the pilot stays on and the logs won't light, the thermopile or entire pilot assembly could be bad. If you have an IPI system [automatic lighting system from remote or wall switch] there may be an issue with the control module.

Dec 29, 2013 | Home

1 Answer

Have winrich perfecta ventfree lp model 6380. Very hard to start. Ignition switch never worked correctly. Pilot and ods showing corrosion. Doesn't stay lit very long. Can I replace the pilot/ods a


First clean out pilot light with can of air , or blow down it with a tude.
Then brush electrode clean with a clean paint brush ,chech to see if electrode is in the right postion to light the gas not too far away and the spark is strong , Clean thermopile head if fitted, then check thermocuople /thermopile connections are tight . see if this helps .

Oct 28, 2012 | Heating & Cooling

2 Answers

The remote no longers turns on the fireplace.


  • Is your valve turned "on" and not in the "pilot" mode?
  • If your valve is in the "on" position, try turning the Skytech receiver's switch to "on" instead of remote.
  • If the fireplace ignites when the receiver is "on" then the remote needs to be re-synchronized.
  • If the fireplace valve is "on", the remote's receiver is in the "on" position, and the fireplace will not light, then you most likely have a bad thermopile in your fireplace and need service.
  • Skytech 1001-A product page and manual can be found here.

Dec 09, 2011 | Skytech 1001-A Fireplace Remote Control...

1 Answer

I have a Marco gas fireplace model# 794019C. It is the millivolt pilot generator type. I first changed the thermopile and cleaned the spark ignitor to get it to light. I have checked continuity and...


Mike, I suspect that the problem you're having is not related to the new Thermoplie (Pilot Generator) you installed. Its with the Thermocouple. The clue was "Some of the time its hard to keep the pilot light lit". The Thermopile controls the opening and closing of the gas valve, when the wall switch is turned ON/OFF. The Thermocouple, is what keeps the gas valve open and pilot light lit all the time. If there's no flame heat on the Thermocouple, it closes the gas valve. Rather than replace it, you can try polishing it with some very fine sand paper, then wipe the tip with a cotton ball soaked in alcohol. If the Thermocouple is really pitted, don't attempt this. Just replace it. If you do replace it, when you make the connection to the gas control valve, finger tighten the nut, then tighten only 1/4 turn more with the appropriately sized wrench.

By the way, MARCO is no longer in business as MARCO Fireplace. It was purchased by Lennox Hearth, a division of Lennox Heating. And your model firsplace is no longer manufactured. If you continue to have problems with it contact Angie Parrish at Lennox via email angie.parish@lennoxhp.com.

Hope this helped you solve the problem. Please be kind enough to rate my response to you. Thanks and have a good day!

Mar 25, 2011 | Heating & Cooling

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 | Heating & Cooling

5 Answers

How do you check a thermopile? MY pilot is on but it wont light. I checked the manifold and its all cleared. Thinking its my thermoplie not telling the switch to open.


A thermcouple is what keeps pilot on, if your unit has both a thermocouple and thermopile then your pilot CAN stay lit and main burner not come on.do not buy a gas vavle untill you check the thermopile voltage!! very costy blunder.this is how you test it..( open circuit test) Disconnect thermopile leads from valve. take a volt meter set it to millivolts- set it to a mv reading above 500 so that you can test it correctly, my meter has 2000 setting and I use that. connect T/P leads to meter leads.. reading should be 500mv.
( closed circuit test) connect leads of meter to terminals that your thermostat or on/off swich are hooked too, usually top and bottom terminals on most gas valves, turn unit on and reading should be 150mv or more... you need try open circuit. I can test your vavle too if you like keep me posted if I helped or not. 15 yrs experience in gas repairs!!

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2 Answers

PILOT LIGHTING BUT CANNOT TURN ON WITOUT IT GOING OUT


change the gas valve, if the thermocoupling works and the piliot stays lit then it has to be the gas valve check to make sure the screen is clear also,, you said it's propane, check to make sure it is all the way turned on, and has the right pressure it might have a bad regulator on it, but will let other things in the house run good luck

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