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I need help relighting the pilot light on my Marco mfg gas fireplace-model # 794015c

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First, turn the wall switch to the off position. Second, turn the key all the way tcountercockwise to the open position. At the front of the unit, below the hearth opening there is a black front access panel. Should have a little recessed part. pull it out and expose the gas valve. Turn the plunger/knob that says off, on, pilot to the pilot position. You'll knw your in the pilot position when it lines up with the indicator (usually a red or black mark on the gas valve body). If you are in the pilot position, you will be able to push in the pilot (it will feel springy). Push the plunger in and then push the red button (piezo ignition button) in until it makes a snapping sound. You may have to do this several times because the air has to bleed out from the pilot tubing. This should light the pilot BUT wait. DO NOT LET GO OF THE PLUNGER ONCE THE PILOT IS LIT. You need to keep the plunger depressed for about 30 seconds and then let it go. After 30 seconds let the plunger go and verify the pilot is lit. If not try the last step over. After the pilot is lit, you may turn the plunger/knob to the on position. Now go back to the wall switch and flip it on. If it doesn't come on tap it hard. Sometimes dust can actually prevent it from making good connection. I work on fireplaces for a living and coincidentally worked on this model today. Simple as pie.

Posted on Sep 15, 2010

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Once I press the button to start the heater must wait a good 30 seconds or more before it stays lit when button is released.


That's normal. It's the correct way to allow the the Thermocouple and/or Thermopile to fully heat up.
If you have been turning the pilot light OFF after each use and then relighting it when you want to use the heater, that's really not necessary. Leaving the pilot lit during the heating season is a better way to go. If you think you're saying gas by turning the pilot light OFF and then relighting it again, when you want heat, you're really not saving a significant amount of gas or money. The pilot burning continuously, uses very little gas.

Hope this helped you. Please let me know. Thanks

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Gas fireplace wont stay lit- it is a sealed unit so can taccess the pilot or gas holes in the logs. is it safe to remove glass panel?


Yes, removing the glass is safe, if you do it carefully, so as not to break it. Put it well out of your way, after removing it. In fact, removing it is the only way to access and service the Pilot Assembly and the Burners.

If the pilot won't stay lit, there are several things that can cause this on a Direct Vent Gas Fireplace:
  • The direct vent on the outside of the house is block or clogged.
  • Wind is blowing back through the direct vent, blowing out the pilot.
  • Low gas pressure
  • A dirty pilot.
  • The thermocouple and/or Thermopile (part of the pilot assembly) has failed.
If you can provide me with the make and model number of your gas fireplace, I may be able to furnish you with an Owners Manual, that will help you to continue to troubleshoot the problem.

Hope this helped you.

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In cleaning my gas-fired Marco fireplace, unsure original base configuration, mine has only burned out mineral wool pieces. The metal flat base has a row of small ports along the front. A single row of...


Unfortunately, you didn't list the model number of your fireplace and whether it's vented or vent-free. However, I suspect it's vented, as MARCO (now out of business) manufactured very few vent-free models. Restoration is going to depend on the condition of the burners, as well as the gas control valve and the condition of the firebox. The small ports you mentioned, are for the Rock Wool (Glowing Embers), which are divided into small pieces (dime size) and fluffed, then placed over the small ports. MARCO did not make a vented fireplace where silica sand was used on top of the burners. Normally, you only see that on vented gas log set, that is installed in a solid fuel burning (masonry) fireplace and operated with the damper fully open.

As far as restoration parts are concerned, I seriously doubt there are any available. MARCO, as such, has been out of business for almost 10 years. Today's burners are not designed for the same configuration that you have. It wouldn't be wise to try to change the configuration, as the firebox was tested and approved for only what's in there now.

Wish I had better news for you. But, my 15 years in the hearth and home business, tells me it would difficult and costly to do.

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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!

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The reason this is happening is that the overload switch, which is part of the safety features has gone bad. That's why the burner will only light with the glass off. The orange color of the flame from the pilot flame is normal for propane.

Unfortunately, this is not a DIY fix. If you can find a qualified service technician, that's the best way to go. As, Heat-n-Glow fireplaces are a basic, builder box line. And as such, have some quirks that other, more expensive gas fireplaces don't have.

Hope this helps solve your problem.

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1 Answer

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