Came home after being away a few hours yesterday and discovered the fan wasn't running. Unit sort of smelled a bit odd too - like possibly overheating? Display said "air defrosting". Have never seen that notice nor had any problems before. Unit is 11 years old. After the coils defrosted, I tried it again with the same result. Problem is - all the local pool companies (including the one that did the installation) are busy closing pools. And yet now is the time I need the heater for these last few weeks here in PA! Any suggestions? I suppose there's little I can do.