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Topic: Gene Mystery (5 msgs / 112 lines)
1) From: Scott Bukofsky
Hi there, folks.  I could use some advice.  I have had my Gene Cafe for the
better part of two years, roasting several times a week in all weather
conditions.  All along, my roasts have been more or less rock solid
consistent, hitting first crack about 12 or 13 minutes in, and easily having
4 or 5 minutes before 1st and 2nd crack.  This is largely with a profile of
360 degrees/5 minutes, 440 degrees/5 minutes, and 460 degrees to the end.
The coffee has been great
Suddenly, about two weeks ago, something changed.  First crack is a tad
earlier, but not alarmingly so, but now 1st and 2nd cracks run together
within a couple of minutes of each other.  It is impossible to slow things
down, and I run right through to at least Full City+ or more every time.
There is absolutely no difference shown on the thermocouple display.  The
temperatures seem fine, and the ramp time between temperatures is consistent
with what I have had before.  The chaff collector looks fine, and is cleaned
regularly.  I am stumped at what to poke at next.  If the machine has an
issue, it is not obvious to me.  If anyone has any brainwaves, I would love
to hear it.
Many thanks,
Scott
-- 
scottoscoffeeandtea.blogspot.com
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2) From: R Nepsund
Sounds like the heating element is not switching off.   The GC
controls the temperature by just turning the heating element off when
the temperature goes over what you have set it to.
On Fri, Aug 7, 2009 at 5:05 PM, Scott Bukofsky wrote:
<Snip>
ngs
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3) From: John A C Despres
Scott,
Is the heater cycling on and off?
The only other thing I can think of would be the chaff collector. Have you
taken it totally apart? The gold screen we see from the outside can become
terribly clogged without our knowing it. If you're clean there, it's time
for a call to Tim Skaling. 805 501-7731.
John
On Mon, Aug 10, 2009 at 12:34 PM, R Nepsund  wrote:
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4) From: Scott Bukofsky
The heater cycles on and off - everything appears normal.  I took the chaff
collector apart and scrubbed it, plus I re-vacuumed the air intake screen.
I should mention that I normally keep both of these clean, but I went ahead
and re-did it anyway.
First roast post-clean acted more normal - stay tuned.
Is there any chance that a higher moisture content in the beans I have due
to our crazy weather can cause a difference?  I seem to be seeing a
difference between beans that I have vacuum packed and those that are
hanging around without it.
-Scott
On Tue, Aug 11, 2009 at 8:11 AM, John A C Despres wrote:
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5) From: Steve Bien
Your experience is not very different from mine and I've always taken it to
be the nature of the Gene. I get FC at about 12 minutes +- and SC a little 2
minutes later. Often first crack type sounds will continue into the second
crack so there isn't a clear separation between the two. Since this is true
on my replacement heater as much as before, I take it to be just the way the
Gene works. 
My practice is to time from first crack, which is a more distinct event, and
then use my eyes and nose to decide when to quit, usually by 16- 17 minutes,
depending on the bean and roast. I rarely go beyond FC+ and I have no
trouble deciding how to stop the roast at city. I use the e stop method and
then cool with a fan mounted over a sieve. 
Steve
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