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When the main burner turns on, it shuts off after a few seconds

I have a very basic Cozy W505F (2-sided) wall heater. This unit has no blowers or fans.

I can light the pilot light, but when the thermostst activates the heater and the main burner lights, it shuts down after only 2 - 5 seconds.
When this happens, the pilot light goes out too.

We recently had the roof replaced, so I checked the vent pipe in the attic.
I found a section that was cocked to one side leaving a small 1/4" gap on one side of the vent pipe, between 2 sections, which I fixed.

I want to get some ideas or suggestions before spending a lot of time tearing into the unit.

FYI, the thermal blocked flue switch does not have a reset button that is readily apparent. I believe I have an older model that has no reset switch.
I have not tried bypassing it yet.

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  • candyman1809 Nov 26, 2008

    i have the same problem, i changed out the themocouple but its still not staying on

  • contactjohnf Nov 29, 2008

    My Endless summer 200209 patio heater has not been used for a season. The pilot light lights, but goes out when I turn the control to light the main burner. I do not hear propane flowing and cannot light manulally either.

  • MikeyVice Dec 02, 2008

    I was dog tired when I posted the problem, and didn't realize that I had not even checked the heater when I got through in the attic.

    The vent repair that I mentioned in my original post did fix the problem.

    I guess it didn't have enough updraft because of the small gap.

    Sorry to waste your time, and I hope contactjohnf and candyman can get their problem solved.

    Guys, if there is a vent on the heater, try looking at that. There may be a thermal switch on the flue that can be reset, or bypassed just long enough to test. Longer than that would be dangerous.

    When I get a chance, I will try to find any actual useful information for you.


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You have a venting issue. Either the vent is blocked or there is combustion air entering back into the heater. Call a qualified technician right now!

Posted on Nov 28, 2008

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