I have an AquaTherm 30VAQ3 heat/ac unit. A friend replaced the filter yesterday. He has done this before with no issues. When I returned home and turned the air on using the thermostat nothing happened, so I tried the heat and tried auto and fan on settings...still nothing went on. I don't want to lose a friendship, so asking here first. Is there some switch on the actual furnace/ac unit that my friend could have switched off??? I checked and it looks like he installed the filter correctly. There is a switch that looks like a light switch and it's on. I switched it off then on again, but this did not resolve the issue. I checked the breaker box and everything is ok. What could be causing this????
