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I did clean out tube and small fitting to fan retried but same results small fan turns on a few seconds then shuts off

Set t stat to heat auto sm fan turns on then unit shuts down tries after about 2 min again same result

Furnace small exhaust fan turns on for 3 seconds ,then unit shuts down unit doesn't attempt to start

Furnace small exhaust fan turns on for 2 seconds then shuts down dose'nt try to light