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Lennox troubleshooting gas keep turn off

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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.

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I would change the thermostat. Sounds like a bad thermostat.

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I have a gas Lennox elite furnace & code light is not turning on

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Lennox furnace model G11Q3-110 v.2 burners light but go out before fan comes on


Troubleshoot an ignition problem on a Lennox gas furnace ...

? 2:44
https://www.youtube.com/watch?v=yXIxgzwMkPs
Nov 17, 2012 - Uploaded by grayfurnaceman
This furnace should light its pilot with a spark then the pilot proves its on ... Troubleshoot an ignition problem on a Lennox gasfurnace .... Pilot and no inducer but is the same model as that great video! ... You probably have dirty burners. ... How do you know spark module is not sending 24 volts to mv and pv ...

Lennox Furnace Model G11Q3-82-2 - RepairClinic.com



Nov 19, 2012 | Heating & Cooling

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 have a lennox 2 stage gas furnace and a lennox XP15 heat pump controlled through the Lennox 7000 touchscreen thermostat. I want to disable the heat pump due to excessive noise due to lower temperature...


At tstat press options. Press installer setup. Yes, you are qualified. System settings, non heat pump. Gas/ oil heat. Save changes. That should do it with no wiring changes.

Jun 18, 2017 | Heating & Cooling

2 Answers

Lennox Gas Furnace that turns on and shuts off in minutes


After troubleshooting like mad, I found that the flame sensor (rod that sits within the flame) was fouled with carbon on the surface. I believe this shields the rod from proper heat detection and the sensor reports that there is no flame and to shut off the gas valve to avoid explosion. Once I pulled out the rod and cleaned it with a wire brush, I have no problem whatsoever--fixed.

Nov 10, 2008 | Heating & Cooling

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