My Goodman furnace burners ignite fine but fan never starts. Have I got a bad fan motor? LED blinks 4 times for High Limit Switch. I've removed the switch and shaking it softly you can hear the internal part moving freely – but perhaps it's still faulty and should be replaced (only $9 on amazon). After the burners run for a period of a minute or so they kick off – which I believe should happen because the fan isn't running – just my thoughts. Any help would really be appreciated.
Goodman gmv950704cxa - installed in 2007