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I have a 20 year old system put in by the builders. Do these coils look like they need to be replaced? Is my refrigerant leaking? What does it mean when there is some green discoloration on the coolant pipe and rust on the coils? My system uses R22. Thank you

My honeywell wifi thermostat went blank while my heater was running yesterday and now I can't shut off the heater unless I unplug the York furnace. Here's what I've checked so far but still can't figure out what's wrong and the cause of my blank thermostat. Would appreciate if anyone can give...