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?

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Re: Millivolt Generator burnout

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.

Posted on Feb 14, 2008

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Re: Millivolt Generator burnout

This is an odd one. I believe the pilot genarator should be 750 mv, also the flame should cover the top 1/3rd of the probe and have a nice blue color. There is an adjustment screw on the gas valve for the pilot flame. This might do the trick. That or its just possible you have a bad batch of replacement parts.

Posted on Nov 04, 2007

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