Several questions here.
1) Lights should not flicker and switch should not make sound (or get unusually warm)
2) You should not have to 'press hard' to get switch to turn off.
3) Are the switches defective. YES. Remove and replace with ordinary toggle switch and see if flickering and sound-making continue. If problems continue, maybe local electrician should assess problem on-site.
4) Press to Release. You are speaking about wires connected on back of switch using 'quick-connects.'
Wire is pushed into a hole where wire is wedged against brass spring and held tight.
To release wire there is usually a hole or slot next to wire. Push small screwdriver into opening. Usually you have to push screwdriver very hard using one hand while other hand holds switch. Then use your additional hand to pull out wire. Or you can clip wire off and then strip back insulation and start fresh on new switch.
5) Builder electricians sometimes buy super cheap brand knock-offs that are not UL rated. Do not think all Leviton products lack quality. Buy new switches at local home center, and new switches will work fine.
6) When replacing switches, pay attention to screw-color that sits next to quick connect. Take a photo before removing all wires.
Screw colors tell electrician how to wire a device, and you can post new question at fixya, or add a comment for specific help.
7) Resources:
http://waterheatertimer.org/How-to-wire-Cooper-277-pilot-light-switch.htmlhttp://waterheatertimer.org/How-to-twist-electric-wire.html8) Take a moment and rate answer:
And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on electrical switches or any do-it-yourself project.
Fixya is always less expensive than a service call.
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