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My ventless gas heater has an uneven flame with orange tips, the flame toward the outer edge is higher than the flame in the middle, and also,when I light the heater, it doesn't just give me a piolot light, it lights the row in back on low, flickers, and has an unstable flame and then you turn it to low, and it goes out until you turn the regulator knob a little higher, for more heat and it goes out completely, all except the piolot light

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This sounds like your gas valve is weak. An orange flame has to much gas and not enough air mixture. Have you trie to ajust the air mixture. If it won't ajust then you will need to replace the valve.

I hope this helps.

Posted on Oct 24, 2008

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