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My ducane furnace,inducer comes on, it lights, blower comes

Customer Question
on. then shuts off...
my ducane furnace,inducer comes on, it lights, blower comes on. then shuts off after a few minutes. then inducer comes on after a bit but it doesn't stay on long enough to light. seems if I shut off the power, it goes thru cycle again but shots off again.
JA: Did you check the furnace's filters?
Customer: it was pretty dirty so I pulled it. don't have another to stick in
JA: Do you plan on doing the work yourself?
Customer: if possible. I am not a furnace expert by any means but I am a mechanic and can work on just about anything with something to guide me
JA: Anything else we should know to help you best?
Customer: i cleaned the flame sensor
Submitted: 10 months ago.Category: HVAC
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Answered in 27 minutes by:
1/5/2017
HVAC Technician: D.E. Anderson, Industrial Refrigeration Service Manager replied 10 months ago
D.E. Anderson
D.E. Anderson, Industrial Refrigeration Service Manager
Category: HVAC
Satisfied Customers: 198
Experience: 15 years experience. Design, install, service of residential & commercial hvac/r equip.
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Hi, how are you? Is there a circuit board in the blower compartment of the furnace? Thanks

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Customer reply replied 10 months ago
pressure switch open with the inducer on is the code its flashing
Customer reply replied 10 months ago
as soon as the fan comes on, the flame goes out
HVAC Technician: D.E. Anderson, Industrial Refrigeration Service Manager replied 10 months ago

You mean as soon as the main blower starts up?

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Customer reply replied 10 months ago
when the main blower starts the flame goes out
HVAC Technician: D.E. Anderson, Industrial Refrigeration Service Manager replied 10 months ago

Do you see the flames blow out any at all before the pressure switch error occurs and the furnace shuts down? Like do you see the flame pattern change?

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Customer reply replied 10 months ago
let me look. if it will even start. after it does it once it takes a while to start up again. the inducer will come on for a few secs then just shot off
HVAC Technician: D.E. Anderson, Industrial Refrigeration Service Manager replied 10 months ago

Alright, is it tripping an error when the inducer shuts off without firing the furnace?

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Customer reply replied 10 months ago
this time it wouldn't even fire the furnace. just started the inducer for 5 or 10 secs
HVAC Technician: D.E. Anderson, Industrial Refrigeration Service Manager replied 10 months ago

That's unusual. With no error code?

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Customer reply replied 10 months ago
the error code is coming up right away. its 3 blinks. panel says pressure switch open with inducer on
HVAC Technician: D.E. Anderson, Industrial Refrigeration Service Manager replied 10 months ago

Is the draft inducer hot to the touch?

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Customer reply replied 10 months ago
no, it is not
Customer reply replied 10 months ago
i just jumpered past the switch and the furnace came right on and the code is gone
HVAC Technician: D.E. Anderson, Industrial Refrigeration Service Manager replied 10 months ago

Flame pattern looks normal?

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HVAC Technician: D.E. Anderson, Industrial Refrigeration Service Manager replied 10 months ago

Usually they will run longer than five seconds before tripping the error. Check the tubing running to the switch for clogs and such. Also check the connections the tube attaches to.

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Customer reply replied 10 months ago
did that already
Customer reply replied 10 months ago
flame pattern looks normal to me i guess. blue flames blowing into the tubes
HVAC Technician: D.E. Anderson, Industrial Refrigeration Service Manager replied 10 months ago

Then I would replace the pressure switch, but I find it odd for it to act up when the blower starts up. The blower should not affect the function of the pressure switch. That makes me suspect a leakage in the heat exchanger, but your described flame pattern disagrees with that too.

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Customer reply replied 10 months ago
none of the tubing anywhere seems to be clogged. i have a manometer. but not sure what the dp is supposed to be
HVAC Technician: D.E. Anderson, Industrial Refrigeration Service Manager replied 10 months ago

Often the labels will tell the amount of vacuum it should be. The labels on the switch. Seems the switch is defective. No change in operation now even when the blower is running?

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Customer reply replied 10 months ago
label on the switch says .6" water column
my manometer is reading 1.5"
HVAC Technician: D.E. Anderson, Industrial Refrigeration Service Manager replied 10 months ago

You have a reading of 1.5" positive pressure?

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HVAC Technician: D.E. Anderson, Industrial Refrigeration Service Manager replied 10 months ago

You would need at least .5" to trip the switch. So I would suspect a damaged draft inducer wheel, a clogged flue pipe, or a crack in the heat exchanger.

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Customer reply replied 10 months ago
i am not sure which is positive or negative pressure. pressure from the flame box is .2 and from the inducer is 1.5 now. so that's 1.3"
HVAC Technician: D.E. Anderson, Industrial Refrigeration Service Manager replied 10 months ago

Disconnect the pressure switch tubing from the switch and hook that up to your manometer and tell me what the reading is. Just jump the switch to get it to run long enough to get a stable reading.

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Customer reply replied 10 months ago
1.3
HVAC Technician: D.E. Anderson, Industrial Refrigeration Service Manager replied 10 months ago

That's too high. Either theres a blockage in the exhaust vent, there is a leakage in the system on the vacuum side such as the housing or heat exchanger, or there is an issue with the blower wheel.

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Customer reply replied 10 months ago
ok. will it hurt to run that way over night to keep the house warm?
HVAC Technician: D.E. Anderson, Industrial Refrigeration Service Manager replied 10 months ago

Do you have carbon monoxide detectors in your home?

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Customer reply replied 10 months ago
i do
HVAC Technician: D.E. Anderson, Industrial Refrigeration Service Manager replied 10 months ago

Yes, I think you will be fine. I just would make sure they are working so that we know you will be safe. My biggest fear would be if there is a small crack in the heat exchanger and flue gas leaking into the home.

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Customer reply replied 10 months ago
exhaust vent seems to be fine. i don't know how it could have blockage
Customer reply replied 10 months ago
the blower does sound a little funny when it starts running. but the exhaust outside the house feels pretty strong
HVAC Technician: D.E. Anderson, Industrial Refrigeration Service Manager replied 10 months ago

Birds. Ice or snow if there is a lot of drift in your area.

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HVAC Technician: D.E. Anderson, Industrial Refrigeration Service Manager replied 10 months ago

Oh well if it feels good outside then I doubt theres a restriction in the pipe itself.

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HVAC Technician: D.E. Anderson, Industrial Refrigeration Service Manager replied 10 months ago

Maybe the wheel is missing a few teeth and it is just enough to prevent it from pulling the vacuum. does the wheel sound like it is imbalanced when it starts up?

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HVAC Technician: D.E. Anderson, Industrial Refrigeration Service Manager replied 10 months ago

You can always pull the housing and inspect it. When you put it back on, use high temp silicone and just run a good bead around the housing where the gasket is. Works great to reseal it.

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Customer reply replied 10 months ago
ok
HVAC Technician: D.E. Anderson, Industrial Refrigeration Service Manager replied 10 months ago

Please keep me updated with what you find. Do you have any other questions?

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Customer reply replied 10 months ago
one other thing i just discovered. theres a vent on top of the flame box. and a rubber piece sitting on the furnace that fits down it it perfectly. this rubber piece reduces the vent from about 2" down to .75". When i put it in the manometer reads only .1"
HVAC Technician: D.E. Anderson, Industrial Refrigeration Service Manager replied 10 months ago

Is this a 90% furnace or an 80%?

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HVAC Technician: D.E. Anderson, Industrial Refrigeration Service Manager replied 10 months ago

Must be a 90%. I never asked. One more idea. Check all of your drains and make sure the furnace is draining properly. I apologize for not asking before now. That was an oversight.

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Customer reply replied 10 months ago
i don't see anywhere it says, but based on the btu in and out, it would appear to be 93% efficient
HVAC Technician: D.E. Anderson, Industrial Refrigeration Service Manager replied 10 months ago

If you have a PVC flue pipe it is. There is no reason to reduce the exhaust vent. If it is 2" that is fine. Check all of your drains. Make sure the draft inducer isn't holding water. Which would also explain the pressure switch issues.

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Customer reply replied 10 months ago
i checked the drain before and i wasn't sure it was but i tried to straighten all the tubing and it for sure should be now. it has one of those pumps that it pumps the drainage across the room to the laundry sink
HVAC Technician: D.E. Anderson, Industrial Refrigeration Service Manager replied 10 months ago

Is there any kind of gurgling when the draft inducer starts up?

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Customer reply replied 10 months ago
there is
HVAC Technician: D.E. Anderson, Industrial Refrigeration Service Manager replied 10 months ago

Remove the drain trap if you can from the furnace, have a bucket ready and see if you get any water flow out of it. You may have a clog in the trap, or the pipe that runs from the trap to the condensate pump.

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Customer reply replied 10 months ago
the flue pipe is pvc
HVAC Technician: D.E. Anderson, Industrial Refrigeration Service Manager replied 10 months ago

Let me know what you find out with the drain.

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Customer reply replied 10 months ago
i had done that previously. after it has been running for a bit i just shut it off and on and there was no gurgling anymore
HVAC Technician: D.E. Anderson, Industrial Refrigeration Service Manager replied 10 months ago

Ah, I see.

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Customer reply replied 10 months ago
but i still have the 1.3" wc problem
HVAC Technician: D.E. Anderson, Industrial Refrigeration Service Manager replied 10 months ago

Then I would continue with the plan to pull and inspect the draft inducer.

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Customer reply replied 10 months ago
ok. i will do that. probably in the morning
HVAC Technician: D.E. Anderson, Industrial Refrigeration Service Manager replied 10 months ago

Alright, keep me updated. Thanks

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Customer reply replied 10 months ago
thank you
HVAC Technician: D.E. Anderson, Industrial Refrigeration Service Manager replied 10 months ago

Thanks

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