I have a Concord furnace that started blowing cold air continually today. The LED on the Honeywell unit is blinking 4 times indicating the limit switch or rollout? The filter was very dirty so I replaced it... then tried powercycling the unit, etc. but the LED still blinks.

Is there an easy way to reset the switches w/out replacing them to see if the issue was caused by the dirty filter?

Most limit and rollouts have reset buttons,, little button is between where the 2 wires are plugged in,, also most circuit boards have a plug-in type fuse,(looks like a automotive fuse) check it ,make sure its OK and not blowed

No reset button or fuse on this model. Any other suggestions?