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My procom wall mount heater NG 18000 BTUH WILL NOT STAY LIT The flame will just go out

Moving everything from around heater, vac the dust out from heater, has the local gas serviceman person come by and check the gas line

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  • 484 Answers

The problem is more than likely in the flame rectification circuit. The little rod that senses the flame probably has barely perceptible corrosion on either its surface or on the physical wiring connections between it and the ignition control module. A little touch with the sandpaper at these connections should take care of it. I've had extreme cases where the actual furnace grounding conductor was creating the issue.

Posted on Dec 06, 2014

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Posted on Jan 02, 2017

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SOURCE: blue flame heater pilot wont stay lit

the thermocouple is bad.replace it and your good to go.about 8 or 10 bucks at your local hardware

Posted on Feb 03, 2009

  • 4 Answers

SOURCE: pilot lights but when ignition pops back up the flame goes out

will either be the unitrol control box or the thermocouple, when you push down you are holding two magnets together and waiting for a small charge to be created from the probe in the flame , if this is not working you have no charge and the magnets won;t stick to allow the valve to open, change the thermo and see if that works first, its way cheaper than a new controler

Posted on Feb 05, 2009

tinytrees
  • 92 Answers

SOURCE: flame goes out

the most common problem is the flame sensor located just behind the fire chamber, about two inches long in a round rubber boot with two wires. you can get one from mr. heater for about 3 bucks. the wires are a different color but all you have to do is splice them to your old wires. it doesn't matter how you connect them.

Posted on Feb 08, 2009

  • 2523 Answers

SOURCE: cozy gravity one sided wall heater...pilot won't

how by extending the duct work will it make the gas valve work ?

if the pilotkeeps going out clean pilot jet , or if the power unit has gone in the gas valve then you would have to change the valve , don't get the flue bit ?

Posted on Feb 24, 2009

stpaulmercan
  • 8 Answers

SOURCE: heater will not stay lit on auto procom ml 300 blue flame

If you have an ML300HGA, it is a manual-control heater, which means you turn it on and you turn it off. No thermostat. It does not have an AUTO setting.

Likewise, the thermostat-controlled models do not have a Manual mode. If you have the ML300TBA, it has a thermostat and will turn itself on/off in order to maintain a room temperature.

On manual models, the numbers (if any) on the dial are heat output selections. Set the control to the highest heat setting and that's what it does until you turn it off.

On automatic thermostat models, the numbers on the dial are temperature selections. Set the control to the highest heat setting and the heater will continue running until it is 85-90 degrees, then shut off. Set it around 2 and it will maintain a temp of around 70 degrees.

All Procom heaters are either automatic (thermostat-controlled) or Manual. None are both.

Posted on Jun 12, 2009

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1 Answer

My flame will not stay lit


The Gas orifice is clogged and needs to be cleaned. Dismantle the orifice from the gas feeder tube and soak it in a solvent such as gasoline for a few hours. Reassemble.

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My blueflame gas heater won't stay lit


So we are talking about the same won't stay lit I will describe both ways. One is when you lift your fingers off the knob it goes out that instant which is probably the thermocouple needs replaced,look to make sure the tip of the thermocouple is in the flame of the pilot light first. The secound version of it is it goes out in a few minutes up to a few hours.The second version is most common.There is a part called a Thermocouple that is mounted next to the pilot light, it is around 3/16 of a inch diameter 1 to 2 inches long and should be mounted so the tip is in the flame of the pilot light. This is what tells the gas valve the pilot light is burning. If any dust ,cat hair ,dog fur what have you gets around the base of the hole the gas from this pilot light comes out of it will bend the gas, which move the flame so it does not hit the thermocouple like it should, this is below the flame so what ever is in there diverting the flame dose not burn up.A draft from a fan or door could do it also.I have used a procom ventless heater as my only heat for 7 years and have to blow it out twice a year. I bought a new thermocouple at the same time I bought the heater to have in the closet in case it went bad some night, it is still hanging there .Because it sucks air in from the bottom past the flame and out the top everything in the air gets burnt into a fine ash dust. So if you use compressed air to blow out your unit you might want to hold a wet towel up in front of it hoping a lot of that white powder dust will stick to it instead of flying around the room . My flame always looks so much better ,less orange and more blue after this .

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Runs an shuts off


So we are talking about the same won't stay lit I will describe both ways. One is when you lift your fingers off the knob it goes out that instant which is probably the thermocouple needs replaced,look to make sure the tip of the thermocouple is in the flame of the pilot light first. The secound version of it is it goes out in a few minutes up to a few hours.The second version is most common.There is a part called a Thermocouple that is mounted next to the pilot light, it is around 3/16 of a inch diameter 1 to 2 inches long and should be mounted so the tip is in the flame of the pilot light. This is what tells the gas valve the pilot light is burning. If any dust ,cat hair ,dog fur what have you gets around the base of the hole the gas from this pilot light comes out of it will bend the gas, which move the flame so it does not hit the thermocouple like it should, this is below the flame so what ever is in there diverting the flame dose not burn up.A draft from a fan or door could do it also.I have used a procom ventless heater as my only heat for 7 years and have to blow it out twice a year. I bought a new thermocouple at the same time I bought the heater to have in the closet in case it went bad some night, it is still hanging there .Because it sucks air in from the bottom past the flame and out the top everything in the air gets burnt into a fine ash dust. So if you use compressed air to blow out your unit you might want to hold a wet towel up in front of it hoping a lot of that white powder dust will stick to it instead of flying around the room . My flame always looks so much better ,less orange and more blue after this .

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1 Answer

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So we are talking about the same won't stay lit I will describe both ways. One is when you lift your fingers off the knob it goes out that instant which is probably the thermocouple needs replaced,look to make sure the tip of the thermocouple is in the flame of the pilot light first. The secound version of it is it goes out in a few minutes up to a few hours.The second version is most common.There is a part called a Thermocouple that is mounted next to the pilot light, it is around 3/16 of a inch diameter 1 to 2 inches long and should be mounted so the tip is in the flame of the pilot light. This is what tells the gas valve the pilot light is burning. If any dust ,cat hair ,dog fur what have you gets around the base of the hole the gas from this pilot light comes out of it will bend the gas, which move the flame so it does not hit the thermocouple like it should, this is below the flame so what ever is in there diverting the flame dose not burn up.A draft from a fan or door could do it also.I have used a procom ventless heater as my only heat for 7 years and have to blow it out twice a year. I bought a new thermocouple at the same time I bought the heater to have in the closet in case it went bad some night, it is still hanging there .Because it sucks air in from the bottom past the flame and out the top everything in the air gets burnt into a fine ash dust. So if you use compressed air to blow out your unit you might want to hold a wet towel up in front of it hoping a lot of that white powder dust will stick to it instead of flying around the room . My flame always looks so much better ,less orange and more blue after this .

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2 Answers

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all the solutions quoted have nothing to do with my problem.
if any of them applied, it wouldn't be a problem with 2 new heaters, as well as the 3 year old heater.
the flame of the pilot jumps away from the orifice after varying periods of time.

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1 Answer

Heater will not stay lit on auto procom ml 300 blue flame


If you have an ML300HGA, it is a manual-control heater, which means you turn it on and you turn it off. No thermostat. It does not have an AUTO setting.

Likewise, the thermostat-controlled models do not have a Manual mode. If you have the ML300TBA, it has a thermostat and will turn itself on/off in order to maintain a room temperature.

On manual models, the numbers (if any) on the dial are heat output selections. Set the control to the highest heat setting and that's what it does until you turn it off.

On automatic thermostat models, the numbers on the dial are temperature selections. Set the control to the highest heat setting and the heater will continue running until it is 85-90 degrees, then shut off. Set it around 2 and it will maintain a temp of around 70 degrees.

All Procom heaters are either automatic (thermostat-controlled) or Manual. None are both.

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