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Why does my blue flame ventless propane heater go out for no reason?

They all burn good for a day or up to a week then just start going out .first one i bought last year from lowes worked fine for two days then i came home from work and it was out and would'nt relight it was late friday so i boxed it up quick and took it back , got brand new one, hooked up worked good about 3 weeks then started going out like first one i live in south winter was about over so i just used kerosene heater when gas went out. this year i bought brand new different company (kozy world) CWD308 hooked it up worked fine for few days then started going out. 3 heaters from two different manufact. doing same thing. so i started digging in to problem what i found was when main burner kicked on the pilot would cut back like not enough pressure and come off thermocoupling then all go out. called propane supplier to check supply lines and regulator . he turned up regulator a little then heater workek fine for 4 days, on 5th night it went out ,lit right back up worked another 36hours or so then went out again, now today it will relight pilot burn good and steady but as soon as burner comes on pilot loses pressure pulls away from thermocoupling and all goes out

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Did the gas man use a manometer when the gas pressure was adjusted up? The three basic types are 1. round needle guage capable of measuring approximately 30" water column pressure, 2. U-tube manometer filled with a clear or red glycol, and 3. digital guage.

It sounds like the gas pressure is a few inches water column too high which could cause the pilot flame to actually lift off the thermocouple tip causing flame failure after the gas valve opens. More is not necessarily better when it comes to gas pressure. Normal propane manifold pressure is around 10.5" w.c. with maximum inlet pressure of 14" w.c. This pressure can be accurately measured with one of the above listed manometers by tapping into the manifold downstream of the gas valve or in the pressure tap on the downstream side of the gas valve. Most normal 100% redundant gas controls have an individual pilot adjusting screw in the valve itself for adjusting the pilot size and pressure independent of manifold pressure.

Posted on Nov 23, 2014

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Posted on Jan 02, 2017

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SOURCE: pilot lites; but, as soon as I turn on gas flame

sounds like your thermacouplar is going out and needs replaced. Sometimes these will act like they are working fine , but when the pilot stays on for awhile and later goes out it is a sure sign that it is bad

Posted on Nov 08, 2009

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SOURCE: I just bought a brand new Kozy World blue flame

The thermocouple is bad or not aligned properly. It is the metal bar in front of the pilot light. This bar senses the heat put off by the pilot light. If it does not get hot it will not allow the gas to flow. You either need to align it so that it is in front of the pilot light and receives enough heat to allow the gas valve to operate or possibly the thermocouple has gone bad and needs replacing.

It could also be that you are not waiting long enough. The thermocouple must sense the heat for at least one minute or more before it will let the gas valve turn on. Turn everything to off for at least five minutes. Re-light the pilot light and let it burn for at least one minute and then try turning the knob to on.

Posted on Nov 25, 2010

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