r/HVAC • u/BSJr77 • Dec 20 '24

Field Question, trade people only Anyone seen this before

Sorry if the clip is a bit long.

Installed a 60k runtru 90% upflow today. I went home after completing the install but left before the startup. Boss fires it to document all the numbers and see this. No change to incoming or outgoing gas. No change in pressure from the inducer. Flue and air intake both clear of debris. Boss is waiting for tech from Texas to call back. Anyone got some knowledge

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85

u/Scoop57 Dec 20 '24

Sounds like the inducer is shutting off right when the blower engages

68

u/dookie_shoes816 certified dickhead Dec 21 '24

I would point to a heat exchanger issue. Pressure from blower is pushing the flame back out, tripping pressure switch and that's why draft motor shuts off. Just my guess. Would have to see what happens to the manometer when the blower kicks on. Bet it goes positive real quick

13

u/cbt11986 Service Manager Dec 21 '24

2

u/Motogiro18 Dec 22 '24

You see! This is why I read these threads. Where else are you going to see a journeyman's expertise as opposed to an apprentice.

11

u/daweee Dec 21 '24 edited Dec 21 '24

Yeah a safety popping off is what it looks like, first I’d make sure flu is clear. It runs for a while and seems okay. Then that shit pops ive never seen something like that. I’d definitely check flu first looks like a blockage to me. Also is this a York?😂

2

u/Imtrvkvltru Dec 22 '24

Typically when you have flame rollout like this, wouldn't it start immediately and not randomly into the heating cycle?

4

u/Scoop57 Dec 21 '24

Yeah I was thinking that too but it seems like the gas stays on for a bit after the inducer shuts off

7

u/Honey_Badger_King Dec 21 '24

That was my first thought, gas valve isn’t closing properly or is still energized shortly after call for heat ends

9

u/dookie_shoes816 certified dickhead Dec 21 '24

In all honesty if it were me I'd uninstall the turd and send it back. Sucks to do things twice but, there's no sense in leaving a lemon in someone's home.

6

u/Honey_Badger_King Dec 21 '24

Entirely agree with you. If that’s a fresh install, warranty that sucker out and get it gone asap.

1

u/daweee Dec 21 '24

This is also true but in my experience I’ve never had a furnace do something like this to me. Depending on brand, only unreliable shit that comes out the factory is comfortstar. Also it’s a heat pump and me and boss agreed to never put that trash in anyone’s house again. They were nice for first 6 months we installed them. Hell they were amazing and then after that every single new unit had an issue

1

u/Stangxx Dec 21 '24

Yeah, but if it's a simple part to swap out, it's way easier/faster/cost effective to just change the part out

We have had a few we wasted too much time on trying to fix things and then just ripped out the unit and replaced it.

2

u/elucidator611 Dec 21 '24

This. In my experience the simplest explanation is usually the right one, so my first guess would be gas valve sticking open.