Re: OT: RV furnace help needed

In article
<34c86437-8e35-4516-b6b3-28c891ec96cc@xxxxxxxxxxxxxxxxxxxxxxxxxxx>,
oldfart <alan.westcoast@xxxxxxxxx> wrote:

Charles,
The sail switch is nothing more than a micro switch with a long piece
of material that extends into the air flow. The force of air from the
blower trips the switch and thus allows electricity to continue forth
and open the gas valve (I previously spoke about) alowing propane to
enter into the furnace chamber where your electronic igniter lights it
creating heat. If the sail switch is not thrown it tells the gas valve
not to ignite because the air blower is not working and the system is
going to overheat. It is a safety mechanism. Mine recently would not
trip and I had to remove the furnace and clean all the lint and cat
hair from around the switch so as to allow the gas valve to open. This
is a common problem. To access the sail switch you must remove the
furnace. Mark all your wires first.OF

I found the circuit diagram for my heater, and I don't think it's the
sail switch.

http://www.atwoodmobile.com/Service/Trouble/heatingvid.cfm

If the sail switch was stuck open, I would never get power to the
circuit board which would prevent the ignitor from ever operating, and
the gas valve would never open. I can definitely hear the ignitor
opening. I'm going to go at it with my fancy DMM though. Should be
easy enough to trace the voltages around.

--
Charles
'99 YZ250
.

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