On Mon, 11 Jan 2016 07:26:12 -0500, Stormin Mormon
wrote:

On 1/11/2016 1:47 AM, ir wrote:
"Open rollout switch circuit" error message in furnace.

A friend called me and said his gas furnace keeps shutting off. It's
fairly new and a high effencincy type, which vents out thru PVC. It
has a digital readout which says "Open rollout switch circuit". I
googled that, and found a simple drawing which shows it as a sort of
sensor, and found a picture of one. Not much more.

I emailed him the pictures and told him to shut off the power and set
his meter to OHMS and check that switch. He said there are two of them
and they are both turned to the ON or CLOSED position (Not open).

The outside temperature is well below zero, and he has kids, so I told
him he better just call a furnace repair company. If it was an older
furnace I could probably fix it, (assuming I could get parts), but I
dont know anything about these "computerized" furnaces.

He called a furnace company, the guy is swamped with calls, but said
he will come as soon as he can, but that could be several hours. The
guy told him to use space heaters till he gets there. Even if I
thought I could help, I doubt my truck will start in this cold, so it
dont make any sense to try, knowing nothing about these kind of
furnaces.

All I know is that it's a Lennox and it's giving that error code.

While I'm sure the furnace repair guy will get there before I even get
a reply on here, I thought I'd post this to see if any of you know
anything about it... I always like to learn new home repair stuff.

What's the purpose of these switches and what could be wrong?

I did tell the guy to make sure his intake and output pipes were not
clogged outdoors. He said they are fine! He also tried another
thermostat, since he had saved the old standard one when he replaced
it with a programmable one last fall. That did not change anything, so
we know the t-stat is not the cause.

Anyone?


Rollout safety switch senses when the flue gasses
fail to go up the chimney. Very often when it is
windy, the wind pushes "down" the chimney, and
prevents the flue gas from going up and out.

If the wind has changed, it may be fine to reset
the switch (if it has manual reset button) and
he's good to go. If it trips again, might be a
birds nest or some other thing blocking the
chimney.

I'd not want to reset it more than once, there
is a real risk of killing your family with carbon
monoxide.
If you read the OP, theer is no chimney. It is a high efficiency
condensing furnace with pvc exhaust going throgh the wall.