Hot tub makes a humming sound when you turn on the jets

You either have a locked pump, impeller or stripped impeller on the pump shaft. Remove the jet pump assy and repair the pump and or impeller. You can also replace the pump assy.

Hello, sounds likemyou have either a bad humidistat or solenoid valve, disconnect the wires from the humidistat if this turns off the humidifier than replace the humidistat. If not the solenid valve will need to be replaced,

Don't know why so much water. May be able to adjust by turning down valve tap. Turn unit on and you should be able to hear water pressure decrease. Make sure damper in 6" pipe is open so humidified air will get through system. When very cold humidities are lower. Also must hum. mfgs. suggest connecting with hot water instead of cold (vaporizes faster) don't know which you have

need to replace fan control switch. CK SEARS FOR REPLACEMENT PARTS.you will have to order

Review figures 5, 6 and 7 on the installation instructions and compare with how you wired your installation.
The red wires are not used if you use a mechanical humidistat, (are used with electronic humidstat - supplies 24 volts and go to "hot", "commod" on humidstat). Yellow wired to "Hum" whether electronic or mechanical humidistat used.
If using sail switch or current sensing relay, cuts into one of the yellow wires. - One yellow goes directly to humidisat, then comes out of other side of humidistat & runs to to relay (or sail switch), and comes out of relay (or sail switch) and runs back to humidifier.

http://www.appliancefactoryparts.com/humidifiers/helpcenter/breakdowns/honeywell/honeywell-he360a1027.html
A breakdown diagram of parts etc above.
http://www.appliancefactoryparts.com/content/pdfs/110672-4.pdf
Shows you the HE360A.
To me it sounds like it is wired incorrectly, the solenoid should NOT get too hot at all. The PDF above shows wiring data.

Please have the selonid valve replaced.The coil is shot.

That will work, The HUM feeds power to the humidifier when the fan is operating even in cooling on most models, However the humidistat must also be calling for humidity and probally won't call during the cooling months

Neither, even if the solenoid or humidistat stick, it should always drain properly. Is the unit mounted on the cold air return duct or the supply plenum? If it's mounted on the supply plenum, the water panel might be getting blown forward and spilling the water. High efficient furnaces also can leak water on the floor if its drain is restricted. If hum. is mounted on return duct make sure drain is clear by blowing through it. On Honeywell hum's I've seen the rubber hose from the solenoid valve to the distributor tray leak too, check the rubber 1/4" hose.