[Homeroast] I-Roast2 malfunctions

Jim Anderson ural.jim at gmail.com
Sun Dec 27 10:50:21 CST 2009


Here is another vote for the pressure switch. I actually wired around mine
to solve the problem. Haven't used that roaster for quite a while so can't
remember if it is normally open or normally closed, but easy enough to
determine once you have it open.

Good luck,

Jim

On Sat, Dec 26, 2009 at 10:22 PM, Doug Hoople <doughoople at gmail.com> wrote:

> Hi Starfinder,
>
> Could be there's a really simple answer. I used to have problems, too, that
> answered your description.
>
> Turns out that it was simply the pressure switch between the upper and
> lower
> units. It was a little bit loose, enough so that the iR2 would cycle to
> cool
> partway through the cycle.
>
> My fix was very crude. I simply folded a bit of copper foil (from a ham
> radio ground plane strip) over the tab that actuates the switch. A simple
> spacer, actually. It added just enough downward pressure to prevent the
> problem from ever recurring.
>
> Before I found this simple fix, I was very frustrated and wanted to return
> the unit, but was worried that, with the intermittent nature of the
> problem,
> I wouldn't be taken seriously by the manufacturer. In the end, it didn't
> matter. The iR2 has worked beautifully ever since.
>
> With any luck, the problem you're working will turn out to be similar.
>
> Good luck, Starfinder, and let us know what it turns out to be!
>
> Thanks.
> Doug
>
> On Sun, Dec 27, 2009 at 6:50 PM, Starfinder Stanley <coffee at starf.org
> >wrote:
>
> > Thanks for taking the pics, Allon!
> >
> > I don't think there's a lot of crud in the machine because the base isn't
> 2
> > years old --- it's a replacement unit that has seen pretty light use for
> > about half of the last year (largely because it wasn't working right to
> > begin with).  However, it was working better than the base it replaced,
> > which wasn't working at all ----this one just had to be restarted 3 or 4
> > times to complete a roast.  Having done the routine myself about 5 times
> > this week, I can attest that as a roasting method, it's a pain in the
> butt.
> > So my wife's mom wasn't messing with it, plus she was dealing with health
> > issues for about 6 months and not really into roasting for a while.
> >
> > I also don't think that the unit is shutting down in response to actual
> > overheating, since it just resets itself and will start right up again,
> at
> > which point it might run through the rest of the roast or only for 10
> > seconds (no discernible way to predict which).  Don't most thermal cutout
> > switches prevent restarting until the thing cools down?
> >
> > All of which leads me to think that there is a faulty component causing
> the
> > unit to shut down inappropriately; the thermal cutout switch sounds like
> a
> > promising suspect.  The mother in law said she fell into the iRoast
> > customer
> > service purgatory when she last called and gave up, as it was quite an
> > ordeal getting anywhere the last time she'd dealt with them.
> >
> > I wonder how hard it is to get a replacement thermal cutout switch?
> >
> > On Sat, Dec 26, 2009 at 7:27 PM, Allon Stern <allon at radioactive.org>
> > wrote:
> >
> > > Grr. List seems to have dropped my messages, for some reason.
> > > Here are my responses which never hit the list, near as I can tell.
> > > -
> > > allon
> > >
> > >
> > >
> > > Begin forwarded message:
> > >
> > > *From: *Allon Stern <allon at radioactive.org>
> > > *Date: *December 26, 2009 1:19:22 PM EST
> > > *To: *"A list to discuss home coffee roasting. There are rules for this
> > > list, available at http://www.sweetmarias.com/maillistinfo.html" <
> > > homeroast at lists.sweetmariascoffee.com>
> > > *Subject: **Re: [Homeroast] I-Roast2 malfunctions*
> > >
> > >
> > > On Dec 26, 2009, at 1:01 PM, Starfinder Stanley wrote:
> > >
> > > Next I'll see if it runs through the whole cycle without beans, I
> > guess....
> > >
> > > Anybody have any ideas, suggestions?
> > >
> > >
> > > Well, it sounds to me like the thermal cutout switch is opening. Most
> > home
> > > appliances that generate heat have a thermal cutout switch to prevent
> > > runaway operation in the case of a malfunction, which might lead to a
> > fire
> > > or catastrophic failure.
> > >
> > > After two years, I'll bet theres a lot of crud built up inside the
> unit.
> > > Here's some pictures of a unit being taken apart. This one had an open
> > coil
> > > in the heating section; I have yet to get around to repairing it.
> > > http://www.radioactive.org/iRoast2%20Teardown/Photos.html
> > >
> > > These photos concentrate on the electronics, not on the fan and heater.
> > The
> > > fan is a simple shaded pole motor, which comes apart pretty easily, and
> > can
> > > be cleaned. The impeller can also be removed and cleaned. The crud
> > build-up
> > > inside the fan assembly may cut the airflow in a way that external
> > efforts
> > > will not address. If you are not comfortable taking the unit apart, do
> > not.
> > > You can get hurt, or cause a fire. But if you are comfortable with
> fiddly
> > > electronics bits, I suggest a complete teardown may be in order if you
> > want
> > > to rescue this machine.
> > >
> > > I make take a few more pictures of the fan assembly, if you want to see
> > it.
> > > In fact, no. I will go take pictures now. Back in a few :)
> > > -
> > > allon
> > >
> > >
> > >
> > >
> > >
> > >  Begin forwarded message:
> > >
> > > *From: *Allon Stern <allon at radioactive.org>
> > > *Date: *December 26, 2009 1:36:39 PM EST
> > > *To: *"A list to discuss home coffee roasting. There are rules for this
> > > list, available at http://www.sweetmarias.com/maillistinfo.html" <
> > > homeroast at lists.sweetmariascoffee.com>
> > > *Subject: **Re: [Homeroast] I-Roast2 malfunctions*
> > >
> > >
> > > On Dec 26, 2009, at 1:19 PM, Allon Stern wrote:
> > >
> > >
> > > I make take a few more pictures of the fan assembly, if you want to see
> > it.
> > > In fact, no. I will go take pictures now. Back in a few :)
> > >
> > >
> > > http://www.radioactive.org/iRoast2%20Teardown/Extras/blower_a.jpg
> > > http://www.radioactive.org/iRoast2%20Teardown/Extras/blower_b.jpg
> > >
> > > The circular white component on the top of the upper-left piece in the
> > > first picture is the thermal cutout. Those will sometimes exhibit a
> > failure.
> > > It could be that the thermal cutout has failed, or that it is working
> to
> > > prevent a hazardous condition.
> > >
> > > -
> > > allon
> > >
> > >
> > >
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