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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 5648
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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Plus 90 will not turn on and no pilot light. Bottom right

Customer Question

Bryant plus 90 will not turn on and no pilot light. Bottom right window is flashing 2 rapidly with a yellow light.
JA: I'll do all I can to help. How long have you been dealing with this?
Customer: A couple days
JA: Do you plan on doing the work yourself?
Customer: Yes
JA: Anything else we should know to help you best?
Customer: No
Submitted: 1 month ago.
Category: HVAC
Expert:  airheatman replied 1 month ago.

Can you give me complete model from inside furnace in burner compartment so I can provide guidance with this specific unit.Model will be on a label just above burners on right or left inside panel

Customer: replied 1 month ago.
36G24 type 518
Expert:  airheatman replied 1 month ago.

That is gas valve number model will be on a label as show in picture.It will begin with 3 numbers like 517 or similar

Customer: replied 1 month ago.
Oops, 350MAV036080FHKA SERIAL NUMBER 3404A14763
Expert:  airheatman replied 1 month ago.

THanks, ***** ***** grab a manual. Now while I do so, Turn power off to furnace.Thermostat off. Then power back on and call for heat.Note exactly what happens and first error code we get.

The normal sequence of operation:

Inducer vent motor comes on

Pressure switch closes

Igniter lights

Burners ignite

Main circulating blower comes on

If furnaces fails anywhere in the sequence we should get an error code by blinking lights on the control board. Turn power off and back on, then call for heat.tell me how far in that sequence it goes and what error code is on first failure We will go from here.

Customer: replied 1 month ago.
Nothing happened. No kick on not heat. Just blinking yellow light bottom right window
Expert:  airheatman replied 1 month ago.

Next look on door panel and tell me if this matches the error code status chart .

Customer: replied 1 month ago.
it matches
Expert:  airheatman replied 1 month ago.

OK as you will note, we should get a code represented by short and long flashes. EX one short two longs. What are we getting?

Customer: replied 1 month ago.
Yellow light blinks quickly 2x then blinks 4 times then back to quickly 2x thend 4 times
Expert:  airheatman replied 1 month ago.

OK as you can see on chart, that implies the fuse on control board is blown or circuit is open.Remove the little fuse and see if it is black inside.

Customer: replied 1 month ago.
From the bottom right window? How do I remove the window?
Expert:  airheatman replied 1 month ago.

Remove door panel. Fuse will be located on the furnace control board,See below

Customer: replied 1 month ago.
I have no clue where the furnace control board is im lookin and don't have clue
Expert:  airheatman replied 1 month ago.

Can you send me a picture of furnace? I can point it out

Expert:  airheatman replied 1 month ago.

If you have a paper clip icon on your page you can attach using that link.Or

You can upload the pictures using the tiny pic site .

Here is a link to the site.

Click on Browse , select the file from your folder.then click UPLOAD NOW.

They will give you a quote to enter in the box to verify you are a human.Enter the quote and click UPLOAD NOW

You will see your picture on right side of screen.

Then copy the link URL for email & IM

Paste that link here on the site.

Customer: replied 1 month ago.
Let me know if you don't get it
Expert:  airheatman replied 1 month ago.

Excellent.Thanks.The control board is in the blower compartment.You will need to remove the panel with the window.The light you are seeing is actual on the same board as the fuse.

Customer: replied 1 month ago.
Is it in that window on the bottom right
Customer: replied 1 month ago.
Ok thank you
Expert:  airheatman replied 1 month ago.

Remove the panel with that label on it showing error codes.

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