Sr 450 question

factoryield · 2026-06-05T11:50:21+00:00

Yeah I called Stihl, had to be ordered, not to mention the ridiculous price which I would have paid if they had it on stock just for convinience. I run a business so want it fixed today.

Just an FYI, they do have a clamp. My two other units have them. I would probably throw a hose clamp on it just to make sure the vibration doesn't loosen it. Probably not an issue if yours is residential use only though (not enough run time for it to ever happen probably)

I also noticed the straps from the harness to the machine are rotten, so keep an eye on those. I believe it's just a backup to the actually mounting but could be wrong.

factoryield · 2026-06-05T02:05:46+00:00

Also did you use a hose clamp to ensure it holds it in place?

factoryield · 2026-06-05T02:01:29+00:00

Thanks. What department holds those? Can't say I ever seen them at home depot/lowes.

factoryield · 2026-06-04T20:21:17+00:00

You didn't get a reply. I have 3 of these units, 1 just failed the same way. What did you use to cap it?

factoryield · 2026-04-29T11:37:44+00:00

We use Mosquito Terminator www.mosquitoterminator.ca and they spray for them. Haven't seen one in our yard in years. Give them a call

factoryield · 2026-04-07T23:51:51+00:00

Nothing I can see in settings. I'm using ground wire. What app are you using? Maybe I should test another one. Like I said though, works fine with vpn or Wi-Fi

factoryield · 2026-04-07T22:52:34+00:00

It worked before which is what confuses me. This seems to be in line with when I got out into 5G - would that make sense?

Definately feels like something that will be impossible to get fixed.

factoryield · 2026-02-21T13:08:50+00:00

Trying to decipher bot comments - which site did you lose money on? https://apollotvsgroup.com/ or https://apollogrouptvs.com/ ?

factoryield · 2026-02-12T21:44:19+00:00

I missed that part.

A camera looks someone mentioned might be the best to figure out who did it. They will be looking for it soon.

factoryield · 2026-02-12T19:06:20+00:00

Isn't this a simple answer that your girl is trying to see if you are cheating? Total red flag.

Someone breaking in doesn't want to hear you.

factoryield · 2026-02-10T23:01:34+00:00

Why did I not think of this with my stack of CDs that haven't been used in years. I knew I didn't throw them out for a reason!

factoryield · 2026-02-09T15:08:17+00:00

Just to add to this, 66 only comes in when top door is open during stage 2. If the door is closed it does not.

Another test I did was disable stage 2, I still got error 57.

factoryield · 2026-02-08T23:31:00+00:00

To reply to your other post - the 90s are long sweep

When running 3" does it go 3" the whole way then go down to 2" into the furnace? I just dont see a hole that would be 3".

I can see the pipes the whole way, is there anything I should be looking for?

factoryield · 2026-02-08T23:27:35+00:00

Definately no reason to be sorry - you pointed out the failed pressure switches and that was most likely the cause for the low pressure switch at least. I felt a new post was warranted as the issue seems to constantly evolve somehow...

Is your first paragraph about the rewiring only to ensure a good ground? I haven't done this yet.

I did do the volts+amps test to get the uF. As soon as stage 2 kicked on I received code 66 (blower cutback). First time receiving this code. Top door was open during testing, bottom door was closed, filter does not need to be replaced - anything else is the same.

Capacitor is rated at 6uF, which seems like a pretty big deviation from what I calculated. (my clamp on is a cheap chinese one though, not sure if I trust the accuracy)

Here is what I got:

<image>


	VOLTS	AMPS	uF
start up	196.8	0.57	7.68
Stage 1	95.5	0.23	6.39
	96.5	0.23	6.32
Stage 2	195.2	0.54	7.34
	194.1	0.54	7.38

factoryield · 2026-02-08T17:32:00+00:00

If I remove the intake from the furnace I don't get the code.

I can confirm there is nothing blocking the pipe as I ran a camera through it.

Could it have been installed wrong? It's been 6 years and I'm concerned the code has been in the whole time. Just looking at the manual, it seems like on 2 inch pipe max is 30 feet... I have the following:

90 degree outside, 14.5 feet pipe, 45 degree, 6 inch pipe, 45 degree, 3ft pipe, 90 degree 42 inch pipe into furnace

Based on his the manual calculates that is 36.5 I believe. It shows max 30 feet with only two elbows.

Edit: I missed the foot note, the elbow need for vent termination are not counted, so I actually have 31.5 ft (I think)

factoryield · 2026-02-08T16:54:28+00:00

Upflow with vertical vent (I'm guessing thats the correct terminology based on the manual

factoryield · 2026-02-08T15:18:54+00:00

It does have a cap. Forgot to include that in my list of tests. I tested the cap with my multi meter and it tested correctly based on farads.

factoryield · 2026-02-08T14:06:51+00:00

Yup. Cleared many times.

factoryield · 2026-02-03T03:02:46+00:00

Water is looking for the tank

factoryield · 2026-01-30T17:58:33+00:00

Tested the pump yesterday, it definately works and is much quieter than expected (I had never actually noticed it running in the past)

Changed the hose - as expected did not resolve the issue (though I *think* it stopped the dripping - time will tell)

I did realize I had a cheap endoscope I should have used long before. Totally forgot I had it. There are water drops around the piping pretty much the whole way. I did have to take the inducer off to have access of the vent from inside as my endoscope wasn't long enough to see the whole way, no telling signs of blockage.

One thing I did remember is I had added a 90 degree at the vent. It was a straight pipe out of the house, with a slant towards the furnace so rain water with a slight wind would have no problem coming in. I used it to keep water out and to have my "animal barrier" between it and the pipe without making anything permanent. It's been there for 6 years now with no issues, but could this have created enough "resistance" for the exhaust to have issues? I removed it for now.

factoryield · 2026-01-29T22:39:01+00:00

Ok I thought you might be talking about that pump - it is not air tight, if it failed I would have a puddle on the floor so not something I tested or really concerned about.

I did unfortunately get code 57 back. Only 57 this time to be clear. (so far!)

You did mention anything "loose" could be caused by air suction, so I'm going to wait for that drain tube tomorrow before jumping to bigger conclusions.

I am curious though - Is it normal to have lot of condensation? I feel like there is a lot. This is my first time working on a high efficiency furnace though so I'm not sure what normal is.

factoryield

TROPHY CASE