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I have a Marco gas fireplace, model no: 794004 that won't start. The pilot is lit but when I turn the switch on, nothing happens, no matter how long I wait. I was told that my frpl is connected to either my furnace or thermostat some how & my furnace was shut off for approx 1 yr., if that makes a diff. Can you give me any ideas as to what the problem might be? Thank you.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 124 Answers

SOURCE: Thermastat and furnace

you should have 24 volts between yellow and white wires at the stat when the stat is set to heat and set as hot as it will go. burners should light first then 3 to 5 minutes later the fan motor should fire up. if burner doesn't light check the wires going into the top of the gas valve see if you have 24 volts arriving there from the stat. if you do then the gasvalve is probably bad. you can bypass the action of the stat by jumping red to white on 90 percent of the stats made and in a few seconds the gas valve should click open gas flow to main burner where pilot ignites it. another easy check you can do is flip stat fan switch to on. fan should come on at once. if not then you have either no high voltage to unit or no low voltage ( as in a bad transformer). if the fan comes on you know you have high volts and low volts...by cover i assume you mean the decorative cover but there second cover with the mercury bulbs and all is still there. if you have only the bare subbase then new stat time. sounds like an old furnace if it has a standing pilot, it should be checked for cracked heat exchanger by a pro with a n electronic carbon monoxide detector. NOT a diy item due to the real danger of co poisoning.

Posted on Oct 09, 2008

  • 182 Answers

SOURCE: Furnace pilot is on, pilot ignitor continues to click, no main flame

sounds like the sensing bar on the spark ignition is dirty.....a wire brush works nicely.

Posted on Oct 18, 2008

carldc3
  • 82 Answers

SOURCE: SR-1001 pilot does not stay lit

replace the thermocouple

Posted on Jan 12, 2009

detox101
  • 2 Answers

SOURCE: Gas fireplace pilot flame won't stay lit.

Hi , you can try and pull the panel on the bottom of fireplace out and check the adapter in fireplace. Sometimes they go bad. When you open in also check to see if there is an adapter plugged in and a option to use the battery operated function. If this goes bad the pilot will not stay lit.

Posted on Jan 14, 2009

TheMobilian
  • 8220 Answers

SOURCE: Marco gas fireplace shuts off

This an easy fix. What you must do is remove the dust from the pilot safety. I use rust buster from ace hardware to gently flush the hole. If ther is no hole just shoot a tiny drop or 2 into the pilot burner where the flame comes out. Blow it out (I use a piece of tubing). The problem is the dust drops the pilot flame to a point where it won't heat the thermocouple hot enough to jold the magnet and after 30 minutes she quits. THIS is a picture of where to clean the ODS pilots in your rig.

Posted on Feb 09, 2009

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Small lava rock on bottom (can be bought where you buy gas grills, fireplaces and their parts. The embers at a fireplace shop. Doors open when using and closed when not. If doors are closed while fireplace is being used, they get extremely hot and may burn someone not expecting them to be hot.

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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:
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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.

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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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