I have a Goodman furnace that only locks out at night time it is a 80%. I cleaned the flu, chimney. I did everything possible on the check but it still locks out at night time. When I switch it off then on it works but hours later its locked outbagain

Does it give a code? Before locking out

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Originally Posted by wmproop

does it give a code? befor locking out

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No blinks beside the lockout code. Every time I've been there. I stayed there for 8 hrs it worked fine the homeowner is her 80's so its not an option to get her to get down and count the blinks. The only thing I'm thinking either the pressure switch is bad or board