Question about Cozy (W352E) Heater

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Sometimes when the heater turns on it explodes and flames shoot out. Not all the time, and sometimes it blows out the pilot. Is it the gas valve? It is a cozy wall heater.

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  • resparza290 Dec 10, 2009

    Cleaned out the burner and entire tube area previously, and it still does it. Could the pilot light be too short? On one of the blogs it said it should be 2" long. When it is going to explode you can hear the gas go in for a little while then ka-boom. Again it doesn't do it everytime.

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  • 17 Answers

There may be a spider web in the burner

Posted on Dec 09, 2009

  • Dan Mc Dec 11, 2009

    TRY CHECKING THE ORFIC AT THE BURNER .

  • Antonio Avvocato
    Antonio Avvocato Nov 30, 2016

    I have the same problem resparza290 did you ever find out why it was doing this?

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Why does the flame shoot out after the pilots already on when coming on. It makes a wolf noise I have propane gas heater. I think it may be the thermocouple


The pilot light may mount too far from the main burner. When call for heat, gas valve open to let gas flow but pilot mount too far so a delay to fire may take place. when Burner actually fires, a in -rush will blow out the pilot flame.

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The thermocouple is not working correctly. sometimes you can clean the soot build up from it and it will work again. sometimes they just need replacing. the thermocouple is what the pilot light flame heats up when you turn on the heater. when the thermocouple gets hot it sends a 20 to 60 millivolt signal to the gas valve to activate the gas flow to the main burner.

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The most common problem with these types of heaters is dust build up in the pilot. If your pilot light is mostly a yellow flame you need to blow out the pilot of dust.

Turn off the unit. Remove the cover to expose the pilot. You should find two small holes about an inch or two below the tip of the pilot. Those holes are for mixing oxygen into the gas prior to it lighting. Blow those out with a can of compressed air and you may as well blow out the large burner also with the can of air. Wipe down everything with a damp cloth to remove additional dust.

Sometimes the pilot will light and stay lit, but when the burners turn on the flame moves slightly and pulls the flame away from the thermocouple. Either way this is a good idea to do every year or two on your heater.

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1 Answer

When I turn on the heater, sometimes it comes on and sometimes it doesn't. The pilot remains lit. The repair person ruled out gas problems. Then he said it was the Thermostat but ruled that out and...


It sounds like your problem is delayed ignition.

This can be caused by low pilot flame height (Clean the pilot orifice or increase the pilot gas flow if necessary, by adjusting at combination control valve). Or the burner ports near the pilot flame are clogged and need cleaning. But, don't enlarge the holes. Low gas pressure can also cause this, but your repair person already ruled this out. If you have a wall thermostat, the Thermopile or Pilot Generator (it's the same thing) may be weak and failing. It's not generating enough millivolts of electricity to open the gas valve, when the thermostat is turned up. Or the Pilot Flame is not always touching it. If it is the Pilot Generator, the Cozy Part # is 70098 and cost around $40.00. A talented service man can install it easily.

Generally, these are the first things that you troubleshoot for delayed ignition.
Hope this helped to get you started.

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1 Answer

I have an empire heater and the problem that I am having is that when the valve is turned on high or any setting, the flame burns for a few minutes then goes out. It will not stay burning, we have to...


Have you replaced the thermocouple? Have you cleaned the Pilot? Do you have a strong pilot flame and is it touching the thermocouple? Sometimes if you don't have a good strong pilot is that when you turn the main gas on it pulls the pilot flame away from the thermocouple and cools it off so it drops the signal. Check the gas pressure should have 10 to 11 "WC of manifold pressure.
And you could have a bad gas valve. Hope this helps.

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1 Answer

I have a few issues with an old probably dinosaur Coleman Presidential III 7995a-856 Heating unit. I've had 3 different repairmen look at it and they're clueless. The main pilot will light and stay lit...


if the pilot is clean and and strong then this should play on to the thermocouple , i take it you have changed the thermocouple , and the connection is good at the gas valve , then if this going out could be 1, powerunit on gas valve not holding at thermocouple connection

2. Hole in heatexchanger blowing out pilot when blower comes on

I take it the pilot stays on untill fan comes on and keeps going out , I would think about not putting any more money in to this and get new if sounds as the heater has had its day ,

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I have a bakers pride pizza oven and the bottom oven Including the pilot light) continue to go out for no apperant reason. I have changed the thermocouple 3 times and the pilot light once. Sometimes it...


Several things to check. First be sure the pilot light flame is directly striking the thermocouple. It is a pencil sized rod that is next to the pilot light. Sometimes people reduce the size of the pilot flame to save gas. You may need to increase the pilot flame. Follow the small gas line from the pilot flame back to the gas valve. There is a screw where the small pilot gas line goes into the valve. Remove the screw and then deep in the hole is a tiny screw that can only be reached by a tiny flat blade screw driver. Turn the screw counter clockwise to increase the pilot flame. The thermocouple needs to be red hot to work properly. The second item to check is to see if there are any breezes that occasionally blow through the kitchen. Sometimes the hood fan will draw air under the ovens and actually blow the pilot flame out. Same fix, increase the flame. You may also experience low gas pressure to the appliance during heavy usage. You would need a manometer gauge to check for proper gas pressure. In short, if the oven goes out during your busiest time when everything gas powered is on, the oven may be starved for gas.

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1 Answer

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Lots of time, the pilot light lites and heat up the pin (thermocouple),to tell the gas valve to open and send gas, or the oxygen sensor could be plugged up and needs blowing out ,,,,or the pilot tube could be plugging up and not letting enough gas from the pilot light to shoot past the thermocouple to sense a flame...(.See where i,m going with this?)

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Once the flame has struck it heats up a thermocouple that in turn holds the gas valve open

It is a safety measure in case the flame blows out and the gas keeps on coming.

Sometimes the end of the thermocouple gets dirty and a scrub with a fine emery board does the trick

If not it is a new part (They are not that expensive)

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