94pt 'cool o matic' gally exhaust fan

[Pete Masterson]

I checked all the fuses in the overhead (it's different on a PT-42)
power center and didn't find any blown fuses/tripped breakers.

After disassembling a few things, I'm suspecting that the thermostat
is shot. There's a lot of corrosion on the back side, down where the
switches are mounted.

I'm aware of how to turn on the fan, so that's not the problem. I
previously had intermittent operation (that is, the fan would cycle
on and off -- without regard to the thermostat setting -- but then it
seemed to (mostly) be working as expected for several months. Last
Friday, it refused to go on despite whatever manipulation. In the
past, when the fan failed to come on, slamming the front door often
started it up -- but even that doesn't work now.

I took some things apart and found no 'juice' at the fan.

The thermostat has 3 wires coming it its backside, white, green, and
brown. Shorting either the green or brown to the white (presumably
ground) causes the toe-heater to come on. (This was with the middle
part of the thermostat removed, so the switches weren't active.) How
the thermostat circuits work is a mystery to me.

I'm going to try to find a replacement thermostat at a home center
(although, we're heading into Amish country in a couple of days, so
finding a home center with anything but lanterns might prove
difficult...)


Pete Masterson
'95 Blue Bird Wanderlodge WBDA 42
aeonix1@...
On the road near Scranton, PA



On Sep 30, 2008, at 3:35 PM, Gregory OConnor wrote:

> Kool o matic fan fuse on 94pt is
> front overhead component panel circuit block A "sk5"
> above driver ,in cabinet block close to street side,
>
> to turn on the fan you need to play wit the center thermostat
> try puttining one switch to cool and the fan on auto with the
> thermostat on a low temp setting. to have it run on auto you need to
> pick cool I guess it keeps from exhaustinng generated heat.
> Greg94pt
>