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Do you se legend on furnace for the 1 blink error? Al I am seeing is the 2 blink for pressure switch closed. 3 blinks pressure switch open and 4 blinks for limit
OK lets turn power off to reset board and then call for heat.Let me know how far in this sequnce it goes and if we get a different code on first failure.
Lets try cleaning the flame sensor and see if that helps. Here is a generic video that will give you an idea of hoe to do this.
May be an ignitor going bad.Can you see any marks on it and do you have an ohm meter to ohm it out?
So when it fails, burners do not light and go back out?
Test the plug to igniter and see if the 120 volts is dropping out prematurely to igniter.
When the igniter dies out are we losing the voltage or is voltage staying there, just ignitor dies out.
I also have to leave for awhile,Lets see if we can determine why voltage is cutting out.Perhaps pressure switch is losing vacuum.I will check in when I get back.
I will be in and out so I will check on what you find.
Yes. I hate just throwing out control board but erratic behaviour is very characteristic of a failing board.
Good luck .Thanks for allowing me to work with you.
If you have further questions, please let me know.
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