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Heater won't light

I have a procom mn300tba wall heater and can't get it to light.why doe's it say on the side of it to light by hand?

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  • Anonymous Feb 03, 2009

    Pilot light would not stay

  • Anonymous Feb 03, 2009

    I have a procom mn300tba wall heater and can't get it to light.why doe's it say on the side of it to light by hand?

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Sounds like your thermo couple is bad and needs to be replaced. That senses that you have flame

Posted on Feb 08, 2009

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How do i adjust or take out the thermocouple?


follow the copper wire to the gas valve undo the silver nut follow the thermocouple copper wire to the pilot undo the brass/ silver nut on the pilot replace thermocouple the same way.

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NEED PARTS # FOR THERMALCOUPLE MODEL #MN300TBA


The part # is ND0803-8. Keep in mind, that's a Procom part number not a universal part #.

Before you replace it, I would suggest that you clean the Pilot and the Oxygen Depletion Sensor (ODS). If either is clogged, it can mimic a faulty thermocouple. You can accomplish the cleaning with a can of compressed air with a straw nozzle (like you clean your computer with). Do this particularly, if the pilot flame is curling up and away from the existing thermocouple. It's the first indicator that the pilot and ODS are clogged or semi-clogged.

For future reference I am including a link to your Owners Manual, that you can download and print.

http://www.heaterstore.com/images_templ/procom_ml200_300tba_manual.pdf


Hope this helped solve your thermocouple problem.

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We have 14 ProCom heaters, second cold season...we are having trouble keeping some of the pilot light lit and shutting off after several seconds. The gas pressure in the building is 7.5 lbs and the...


the pilots should be clean ,they should be playing on the thermocouple if this is so then it could be new thermocouples if it was a pressure problem nothing would work , as it 1 , 6, 9 ,11, it could just be dirty pilots hope this helps

Jan 03, 2011 | Procom MN300TBA Heater

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It sounds like the thermocouple for that heater powers both the pilot valve coil and the main burner valve coil. Either the thermocouple is too weak to power both or the main valve coil is shorted out. Try replacing the thermocouple first. If if it still will not start, I would look hard at the main gas control valve.

PS. Sometimes if you clean the thermocouple with fine grit emery cloth it will put out a little more until you can replace it.

Good Luck.

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