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Well, the saga continues. I haven't had them back out yet, but last night while the furnace was running in High Fire after experiencing another Low Pressure fault, I noticed this:

336941

The...

Ted, I just noticed this comment.. is there any point to clearing the codes other than avoiding any confusion about what happened before or after the remediation steps? I've been letting them...

Thanks Comfortdoc, that's great info.

I don't want to be a pain, but do you know where I could find something to back that up? I would like to have something more than "some guy on the internet...

From looking at the pipes, it doesn't seem likely, although I guess if there's a restriction at the vent end it's possible.

I wouldn't think the house is super tight, it was built in 1944.

Not sure exactly what you mean by "where"... it's in that vent kit I linked earlier, on the middle of the side of the house, a...

Well that's a good point - I've never been super-clear on exactly what the Low pressure code is referring to, but I thought it had to do with pressure in the combustion chamber (i.e. pressure from...

I've considered the wind possibility but there doesn't seem to be any correlation between windy days and faults.

The vent kit looks like this: ...

Thanks Ted, this is an intriguing theory. I believe that the CB was new when the furnace was installed because we moved the furnace from the location of the previous one, and because the previous...

Thanks for the replies.

I'm in Portland, OR.

Can you elaborate on exactly what a CO/Combustion Efficiency expert would do? And how I would find one?

As for saving $, I'm not sure they...

Hey all, I'm returning for your advice on how best to resolve some issues with my furnace (and maybe my contractor).

About a year ago, I had this furnace installed after doing quite a bit of...

Thanks for the replies.

Is the consensus still that the ignition faults are normal now that the furnace has had time to learn?

The stat records that the low pressure issue has occurred 8...

really, no ideas?

So a while back I noticed the furnace running in high-fire when it probably shouldn't have been. I checked the status codes and saw "32-low pressure switch open" logged just a few minutes before. ...

Sorry for the slow reply.

It looks like I have a Diversitech CP-22 condensate pump.

Any thoughts on the relative noise level of this pump, and/or installation considerations that might make it...

Good to know, thanks.

Any other spurious codes you can think of that are considered normal?

And any advice on quieting down the pump? :)

Hey all - my recently-installed Carrier 59MN7 has been working great, my only complaint is the condensate pump is a bit on the loud side...

BUT: being the nosy geek that I am, I found my way into...

Thanks again to all who contribute their knowledge and expertise around here - this forum is really a great resource.

My install is finally done and it sure is a nice upgrade.

I ended up...

Thanks again for the replies.

So it sounds like, after moving the furnace, I will be pretty spot-on for supplies (22x7 times two, each feeding 4 supplies) but pretty sad for return flow.

I...

And if not? (I'm not adding AC).

Cool, so I'm feeling pretty good about all this... except for the original question about whether I have big enough returns. :)

If the filter needs to be 530-odd sq in, would I be on the right...

Thanks for the reply.

Just to make sure I'm following; are you saying that my ductwork as described is probably restricted (on the return side?) and higher than .12"? Not clear on what you mean...

So maybe the .12 is the max ESP or worst-case scenario that the furnace is certified for?

Udarrell: I'm confused by this statement:"If the SP is actually closer to 0.5", then the CFM could be more...

I read this doc to mean 1075 cfm @ .12 in wc. Is Certified External Static different than Total?
http://www.docs.hvacpartners.com/idc/groups/public/documents/techlit/59mn7a-02pd.pdf

After I...

Thanks for the replies guys.

More details: my house is ~850sqft main, 250 finished attic, 250 semi-finished basement built in 1944. Upgraded insulation, doors and windows. Mild heating climate...

Hey all - quick question:

How much can one of these things flow?

http://imageshack.us/photo/my-images/24/img00126201111050908.jpg

The story: I'm looking into replacing my old oil furnace...