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I found five control switches and all of them has small reset buttons but none of them seemed to click. I did have some closed registers so I opened them, I checked the furnace's internal filter but...

7 blinks = lockout caused by no ignition

8 flashes = lockout caused by loss of flame

5 flashes = rollout switch open or rollout detected

4 flashes = High Aux and spill limit switch open. What are some suggestions to correct this?

5 flashes = roll out switch open or roll out sensed

York Diamond 80 Furnace Blowing Cold Air. About five years old. Red light is flashing four times.