York furnace problems

talbritt209

I’m reaching out with the hope that I can get some help with my York furnace as it’s been acting up for the second winter season in a row and it’s beginning to get cold.  Last year the furnace would run for a little bit but then would turn off.  I would have to turn the power off and it would turn back on and run. The code on the control board showed it as ignition lockout due to retries.  I pulled the connector from the control board reconnected and it ran all season long.  This year how’s we it started acting up again so I ordered a new flame sensor and replaced it. It was running fine for a little bit but now I’m getting three lights blinking and getting pressure switch stuck open.  If you touch the molex on the control board the light goes back to green and it fires up again.  But then after running a few minutes blinks three red again.
Any help would be greatly appreciated.  I don’t have a multimeter unfortunately to check voltage.  I ordered some parts because they are a way out to get to me. I ordered a control board as well as pressure switches.  I am leaning towards a faulty control board as it starts working after touching the molex wires or putting pressure on the molex.
thanks in advance

mattmia2

Did you push the molex all the way back together until it locked when you disconnected and reconnected it last year? Depending on how it is mounted you might have to hold both halves or wiggle it to get it to seat fully.

talbritt209

Yes I did that and made sure that it clicked in. Inspected the molex and all of the wires appear to be pushed in all the way as well.  

EBEBRATT-Ed

Without a meter your guessing. You can get them cheap at a big box or hardware store.

Sounds like you have a bunch of intermittant problems. I would pull all the plugs of the control board and check them. Sometimes a little oxidation (if your cellar is damp) on the plugs and connectors......it doesn't take much to stop 24 volts

Seabee5701

Could be the control board. I will see if i can.post pictures that show the back of  a control board that is burnt, causing those same type of problems. 

Big Ed_4

I think the control board is doing its job . Maybe last year it was a dirty flame sensor . Now you have an open pressure switch . Remove and inspect the rubber tubing from the draft inducer and clear the ports the hose nipples with a paper clip . Don't kill the messenger ...