How do you clean the fan blades. they are filthy. yes I clean the filters bi-weekly.

yes it is possible , it could have caused a restriction. if evaporator coil has a slight frost pattern from top to btm then your compressor and Freon are good and no restriction . if your evaporator coil is only frosting up only a little then you have a freon restriction.

if you just cleaned the coils today , it takes up to 24 hrs to get back to 100 % .

I find cleaning the filter sponge bi-weekly keeps my koi happy. Normally I change bio media once a year and never at the same time as I clean the filter. There are bacteria that colonize the filter that convert the muck into gases and nutrients. So if you clean them both at the same time you remove this cleaning crew and that can cause issues.

Both...Yes...It's probably clogged or filthy. It can easily be replaced or cleaned.

check for restricted or stopped up catalytic converter.

replace the fan blade then clean the unit to get a very good condition

Check resistance on bi metal thermostat/heating element.Make sure continuity is present on thermostat before defrosting.Advance derost timer if analog unit.

Yes unscrew the screws and thre will be more screw to undo insode to take it apart. I had to do mine an it was filthy! Good luck!

put motor oil to the midst of your fan blade may there are lots of rust inside then wait 5 hours then try to pull again patiently...

hi! there,
well! no brand and model,anyway the guard fan has a quick clip lockaround the fan blade,be sure to unplug your electric fan before doing this, unlock clip lock then the fan has a quick handy lock knob at the center of the fan observed loosening knob there is direction arrow in loosening this if i'm wrong going counter clockwise,or take the direction indicated marked on top of knob.
pull out the blade and have it clean if this is a plastic or aluminum clean it with water and spounge/cleanser,avoid to distorsion on fan blade if happen this will wiggle when run again be carefull and on the second guard fan still connected to your electric fan,there is plastic lock nut release and pull out the 2nd fan guard,try to clean this with water and cleanser,the motor assembly with control and stand just wipe it out ,don't try to get wet specially the motor,let all dried up before reassemble.reverse the process to eassembly