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Hello,My name is ***** ***** I will do my best to assist you. I am looking over your question now and will respond shortly.
did the 4 blinks start as soon as you replaced the control?
On the back wall of furnace behind gas valve...do you see a flat plate with 2 wires attached?
All it is a 1/8" thick flat plate with the 2 wires..
that is a computer generated mesage...I cannot call
correct...tap that switch a few times,,,is filter clean?
is it fixed now?
with a 4 code..open limit tapping the limit resets it quite often...did the 4 code go away?
No problem...that means it worked!
Good thing it fired up....Have a great night and this one is on the house.
I always have some that get the info and then cancel after the advice works..they never cancel before.
Just remember this is much better than calling a service company to your home and and paying a big bill.
I am glad you have heat now...I will close and have a great week.
PS, I am not a robot without feelings...just a service tech who does this part time for my family.
I hope all goes well and consider this closed now that you have it running.