York furnace: 4 blinks and no heat.

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Old 05-03-20, 04:54 PM
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York furnace: 4 blinks and no heat.

Hi guys, I get 4 amber or red blinks on my York affinity 8.S series furnace
I say amber or red because the blink color looks like amber and like red and i am not sure which it is.

4 red blink means Limit Switch Open while 4 amber means Y preset with no G call.

all fans are blowing but the furnace isn't igniting or producing gas.
i have connected the white and red wires from the thermostat is a bid to see if the thermostat is the problem, I got the same 4 blinks.

I was able to remove 2 small plastic wraps from the motor after much probing but still get same error.
does anyone have an idea what or where i should be looking?
Thanks.

 
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Old 05-03-20, 08:36 PM
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Welcome to the forums.

More than likely 4 red flashes for open limit.
If a limit was open..... usually the draft inducer and the main blower will run on a power up.

If the furnace has not heated in awhile and is cold..... you more than likely have a flame roll out switch open as most of the other switches are self resetting on a cool down. The flame rollout switch(es) can be found just over the open burner area. They will have two wires on them and a tiny red button on the back between the wires. Push the red button to reset. If that restores operation.... please let us know so we can elaborate.

There should be a wiring diagram on the back of the blower door.
You can post the full model number for the furnace. It will be found behind the burner service door..... on the side wall near the burner.
 
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Old 05-04-20, 10:14 AM
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There appear to be 3 of such switches but they are all not raise, i push them anyways just to be sure..

still no luck.
here are the images
switch-1:
http://www.oluwaseun.com/wp-content/...7.35-PM-3.jpeg

switch-2:
https://www.oluwaseun.com/wp-content...1-225x300.jpeg

blink color:
https://www.oluwaseun.com/wp-content...M-225x300.jpeg

brand:
https://www.oluwaseun.com/wp-content...2-225x300.jpeg

thanks.
 
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Old 05-04-20, 02:03 PM
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Picture one and two appear to be showing roll out switches.
You haven't posted a model number for the furnace.
 
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Old 05-04-20, 07:17 PM
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The model number is PS8A12N080UH11D and here is the wiring diagram
https://www.oluwaseun.com/wp-content...1536x1152.jpeg
I have a multimeter and can check do simple check.

Is it okay to bypass these switches to test?
 
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Old 05-04-20, 08:03 PM
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Worked! It turns out there is a 4th switch located outside on top of the furnace attached to the exhaust.
i pushed it, though there was not difference in the high of the switch as i was expecting except a click sound.
I saw the ignition turn red like magic

Thanks for your help and which means the blink was actually red.
i have been on this for days and so glad i did not have to call a professional eventually
 
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Old 05-05-20, 12:03 AM
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Glad you found what was tripped.

You need to keep a careful eye on that. Those switches rarely trip intermittently. You should check out your exhaust for any blockage. If it trips again.... you MUST have that furnace checked out. It could even be over firing.
 
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