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Go to Walmart and get Canned Air used to blow out debris from keyboards etc. Place the air tube near the fan vents and blow out debris. Keep the can up-right. Should you turn it upside-down, you will FREEZE everything, so do it correctly.
You are using too restrictive of an air filter. If the codes you are getting off the lights says anything about a high limit this is the cause of your blower running all the time. Use a less restrictive filter or have your contractor install a media filter in the system. if you reset the furnace and it does not stop running the blower you have a stuck limit switch and may have to get another or call a service tech to reset it or replace.
As long as the humidifier start/stop is regulated by air flow there is no way to cycle it on/off with another device. If, however you disconnect that capability and, instead wire it to the heat on cool on switch it will only turn on when the stat calls for heating or cooling. You may need to install an intermediate relay off the stat wires to regulate the different(assuming that they are) voltage of the humidifier start/stop.What a fun project, thanks!
If your "tap water" is from a well, the humidifier may be clogged with mineral scale. Even if it is not well water, your municipal source may have a high mineral content.
Using a 50/50 solution of White Vinegar and water run through the system will usually clean the mineral scale out. In the future, I would recommend that you use Bottled Distilled Water. You can buy it by the gallon, inexpensively at grocery stores or pharmacies.
Sounds like your motor bearings are going bad. If at all possible lubricate the motor bearings using a few drops of a NON detergent oil. If the motor has sealed bearings with no oil ports then you should replace the blower motor.
Is the level of water dropping? If so, the humidifier is working. If you have a cool air humidifier you won't see any steam or anything at all. You will just feel cool air. Watch the water level and see what happens.