Question about Cozy Enclosed Front Console Heater 20,000 btuh Propane

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Millivolt Generator burnout

I have had this heater for approximately 3 years. It worked great for the first 13 months. ( Warranty expired after 12 months). The millivolt generator gets burned out after about 3 months of use. We have replaced it at least 3 times already and getting ready to replace it again or buy a new heater. The flame must get too hot and eventually the generator has no output to heep the pilot lit. Bench testing the unit after it does not work will send a 500 mV signal, but this is with a high heat propane or MAP gas torch. It does not send a signal with the pilot button held, even for 5 minutes. Why do these units continue to burnout. There is only one manufacturer - White Rodgers. Should there be some sort of deflection shield installed?

I have a Cozy CDV156B propane wall heater in both my office and workshop. 2 weeks ago I had the sam problem as mrtrick2, held off on buying a millivolt Generator and just yesterday, my other heater did the same thing. The gas line is fine, the pilot lights with the igniter when I hold in the pilot knob, I hold in the knob for anywere from 2 to 4 minutes and the thermocoupler just will not get hot enough or recoginze the heat, I am not sure. The pilot flame is located perfectely at the generator.
Having read mrtrick2's post, I am not sure what to do now. Really strange that it has happend now to both heaters though. HELP !!!!!!!

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I would check the pilot orfice to make sure you have enough of a flame to heat up the generator. You can buy a orfice drill bit and drill it out one size. The pilot should hit the generator toward the center. You should be able to buy a new orfice for the pilot assembly from the place you bought your heater.

Posted on Apr 26, 2008

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I doubt that it's the pilot generators themselves that have been failing They normally last for years through any temperatures that a pilot flame can produce. More likely, the gas valve is bad and is trying to draw more current than the generator can supply. You could verify that by connecting one of the "failed" pilot generators to a known good gas valve.

If the problem is consistent you could try measuring the resistances of the two electromagnets in the gas valve. If you compare your readings to those for any other gas valve of similar type (same brand or not), they should be in the same ball park. 12 ohms and 10 ohms are in the same ball park; 10 and 2.3 are not. If the problem is not consistent but intermittent, see if by any chance it (a.) gets better when the valve is stone cold and worse after it's been drawing current for a few minutes, or (b.) gets worse when you mechanically disturb the screws and terminals on the valve or the wires attached to them.

That "750 mv" is just a number. In practice, 400 mv is a pretty respectable output. Even 250 mv is usually enough to operate the electromagnets, provided it doesn't drop much lower than that and nothing else goes wrong.

When the pilot flame is too small, the adjustment on the gas control is rarely the problem (or the solution). Much more often, the orifice (located in the inlet of the pilot burner) is clogged and needs to be reamed out. A #79 drill bit is about right for the job, if you have the patience and dexterity for it.

Good luck, mrtrick2 or anyone following in his footsteps.

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